JPS60214188A - Signal transmission system of key telephone system - Google Patents

Abstract

PURPOSE:To simplify the transmission control condition and to improve the reliability of the set by designing the system that a telephone set not receiving a control signal from a master set transmits an operating signal of the same content in response to the reception of a polling signal of next time. CONSTITUTION:After the phase of bytes X1, X2 received is made identical by the master set KSU, whether or not the bytes X1, X2 are coincident is discriminated and when they are normal, the set responds to the signal. In this case, if an error of a received signal is detected, the transmission of a control signal Y is stopped and the system transfers to the transmission of the polling signal PR to the next telephone set. When the control signal Y is not received by the telephone set TEL within a prescribed time after a response signal X is transmitted, it is discriminated that there is an error in the own transmission signal and when the signal PR addressed to the own set is received at the next period, a response signal X representing the operating data of the same content as the preceding content is retransmitted accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a signal transmission system for a button telephone device that transmits and receives control signals between a main device and a button telephone device.

[Prior art]

When transmitting signals between the main device and key telephones (hereinafter referred to as telephones), as the devices become larger or more sophisticated, the main device sequentially sends polling signals to multiple telephones. In response to this, the telephone transmits a transmission signal indicating the operating status of the telephone.
Generally, the main device monitors the received signals for errors and returns a confirmation signal such as an ACK or NACK signal depending on the result.

However, according to this method, it is necessary to send a confirmation signal from the main device, which increases the time required for signal transmission with the same telephone, and when a large number of telephones are installed, the polling signal transmission cycle becomes long. This results in the disadvantage that the main device cannot promptly recognize changes in the operating status of each telephone, resulting in a delay in the main device's response.

However, with this method, the telephone retransmits the same IBA code in response to receiving a NACK signal, which also increases transmission costs and increases the chance of noise being mixed into the signal. ACK and NAC
The operating conditions of the main unit and each telephone set for transmitting/receiving K signals, etc. have become complex, and if they are equipped with a processor, there is also the drawback that it is difficult to create a program.

On the other hand, as a counter to this, a method has been adopted that omits the transmission and reception of NACK signals, etc. for ACK/ξ, but in this case, even if an error occurs in the communication from the telephone, retransmission is not performed. In the main device, if an error is detected in the reception (K), it is invalidated, and if the reception is not performed normally, the operation of the telephone (K) is ignored, resulting in a lack of response from the main device. will occur.

[Summary of the invention]

The purpose of the present invention is to fundamentally solve the drawbacks of the conventional system.When the main device detects an error in the receiving signal No. 4, it stops sending control data to the telephone, and immediately starts polling for the next telephone. A highly effective method in which a telephone that cannot receive a signal indicating control data from the main device will transmit a signal indicating the same operation data as the previous time in response to receiving the next polling signal. The present invention provides a signal transmission method for a button telephone device.

〔Example〕

Hereinafter, details of the present invention will be explained with reference to figures showing examples.
explain.

FIG. 1 is a block diagram of the main unit KSU, which accommodates station lines L1. L2 is the present telephone device m1. 1. for the switching key between TEI and m2. 2, and a telephone meter used as a power outage telephone in the telephone meter device 8, the dial circuit DIC is connected to DIC2 via the direct gear 3+ and 4 for direct connection to the telephone meter TET, 2. After passing through these, the first and second office line links LK, .

It is connected to LK,,2.

In addition, the main unit KSU and each telephone TEN (not shown in the figure),
Between 1 and 8, there is a pair of communication lines Lt~I'ts.
and signal lines -□~La8, which are connected to each other by telephone installation,~TEI, extension link LKI for mutual exchange connection between 8, and amplifier CA and switch circuit for amplifying ringing voice. 5W1=~SW3, a ring tone generating section RTG, an audible signal sending circuit consisting of an amplifier TA for sending out a tone, etc., and a telephone TF; L□ device 8 are provided with links T and KT for exchange connection, Each call line ■1,1・””ta and each link l, KL l l LK
L 2 + LKI +L Latching relay for XSI-
Contact point of XS8 xsl°, x81' = xe8°, xs8
1 is provided, and these contacts and the station line link 1,
There is a contact point X1l10 between , , , LK, , 2.
．． X81' to X88°.

Each communication line Lt□ to Lt8 is connected to the office line link I via XS81, 1. Insert the contacts xclO, xcl' - Xc8°, xc8' of the connection latching relay - '
Similarly, each call line, □~L, 8 is connected between extension link LI (I and 1-link LKT).
Contacts Xll of connection relays XII to XI8 selectively connected to either K and tone link LKT,
xil xi8 and x18 have been inserted.

In addition, latching relays XS1 to XS8, XCI
-xcs and relays XII -XI8 are each provided in correspondence with telephone installation □-'rEL8, and latching relays XS1 to XS8
When LKL 2 sidetone is selected, latching relay Xc
Depending on the situation of 1 to Xc8, the central line 1. □ Or 1, 2 and telephone metering device 8 are exchanged and connected, and latching relay
SI to XS8 are extension links LK and tone links L
When the KT side is selected (1-), depending on whether relays By supplying electrolytic corrosion for telephone calls by the TL, telephone calls can be made between the telephones installed and between the telephones installed at the terminals 8 and 8, and telephone calls can also be made with the door telephone DRP (not shown in the figure) via the door telephone circuit DPC. Link LK
When connected to T, when the switch circuit SWI is turned on, the call voice is received from the door phone DRP, when the switch circuit SW2 is turned on, the call voice is received from another telephone, and when the switch circuit SW3 is turned on, the call voice is received from the door phone DRP, and when the switch circuit SW3 is turned on, the call voice is received from the door phone DRP. ,L,
A ring tone indicating an incoming call is received.

In addition, for the central office line L, switch key Kl,
An incoming call detection unit ■π for detecting the arrival of a calling signal is connected between the direct key 8+ and 4, and the dial circuits DIC1, DIC, and the office line link LKLl are connected.

Between LKL2 and LKL2, there are contact points h of hold relays H1 and H2.
1°, hl 1. h2°, h21 and resistors R1, R, for opening the DC loop are connected in parallel, and at the same time, the station line LIIL11 is put on hold by the operation of relays H1 and H2, and at the same time, a hold tone is generated via capacitor CI+02. The hold tone from the section HTG is to be sent out.

If a pulse signal is used as a dial signal for the dial circuits DIC and DIC2, depending on the conditions of the central office line and L2, a circuit is used that sends out a pulse signal by turning on and off a DC loop. When a composite audio frequency signal is used as a signal, a circuit that is operated by a loop current and sends out the composite audio frequency signal is used.

On the other hand, a processor such as a microprocessor - 47 CPU
.

A control unit CNT consisting of a fixed memory ROM and a variable memory RAM is provided, and the processor CPU executes instructions stored in the fixed memory ROM and performs control operations while accessing predetermined data to the variable memory. By exchanging data with the transmission unit SR through the interface 7, it accepts operation data from the telephone device 8 via the signal lines -0 to Ls8, and also receives the operation data from the telephone device 8 through the signal lines -0 to Ls8.
It accepts the detection force of T and the operation signal from the door phone circuit DPC, makes control decisions accordingly, sends control data for the telephone rear end, to position 8, to the transmission section SR, and transmits each latching relay. XSI～XS8゜XCI
~xcs, relay XII~XI8, Hl, H2,
Dial circuit DIC, DIC2 + hold tone generator HTG
, switch circuits SW1 to SW3 and door phone circuit D
Controls the PC, etc., and connects the telephone T]i! In response to the operations in steps 4 and 8, exchange connections, dial signal transmission, and hold operations are performed.

In addition, an alarm signal AL from an external door switch, fire detector, etc. is also given to the interface A and C, and in response to the occurrence of this, the processor CPU sends control data to the telephone back The alarm sound is sent from the device 8, and an external buzzer BZ is sent via the interface ■β.
It is designed to sound and issue an alarm.

In addition, the commercial power supply AC via the power supply switch SW is stepped down, rectified, and stabilized in the power supply unit PS, and then
9V, +12V, +5V, etc. are supplied as DC power to the valley part, and also to the telephone rear units □ to 8, DC power +19V is supplied to each unit through signal lines La□ to L88 in the transmission section SR. are doing.

The volatile variable memory IJ RMII, which can store important data for control purposes, is equipped with a backup battery BAT, and even in the event of a power outage of the commercial power supply AC, the stored contents can be maintained by backing up the battery BAT. It is designed to be held in place.

In addition, a dial circuit operated by a loop current through the telephone lines Ltl and Lt is installed in the back of a specific power outage telephone, one for pulse signals and the other for complex audio frequency signals. In the case of a telephone set for pulse signals, if the telephone set for pulse signals is connected to a central office line that uses a composite audio frequency signal as a dialing signal, and the telephone set for composite audio signals is connected to a central office line that uses a pulse signal as a dialing signal. In the event of a power outage, it will be impossible to make dial calls from each office line, so a switch is provided for switching between office line connections.When operated, latching relays XCL and XC2 are controlled, allowing them to respond to each other. The telephone rear end, , and end are connected to the central office line, and at the same time, the latching relay DU for holding can also be controlled, so when the commercial power supply AC is turned on, the processor CPU controls the latching relay DU. The state of the contact du is checked, and it is determined whether or not the switch has been operated. The data indicating the status of the data is corrected.

In addition, a setting section FST is provided, which sets special conditions such as incoming call restriction for each of the telephone devices □-TEf and 8, and sends the output of this to the control section 1 CNT. Control is performed accordingly.

Figure 2 is a specific circuit diagram of the transmission section sn, and shows the signal line ■
Between the non-common side line of Ml and the DC '4L source +-19V, a low-resistance resistor I (, 11 and an l transistor Q1□ as a switching element are inserted in parallel rows, and the control is normally off. Control data from part CNT 1) Since sl is "L" (low level) and the 111 power of inverter IN is "■(" (high level), the light emitting diode LIJ
H and constant 1 (11 voltage diode Z+) 1, are off, forward bias ('
From c (・Runsistor Q1□ maintains the on state, and ゛C↓f to signal line I78 through fuse F1□)
It is assumed that one will be given one yen.

For the above, the l-1 control data I)
Io.

Then, the i force of the inverter IN1□ becomes “I,′°, and the light emitting diode LI)1, the voltage regulator diode ZD□1 turn on, and the pace voltage of the transistor Qll is fixed. Since the voltage drops to the Zener voltage of the diode ZD□□, the collector-emitter resistance of the transistor Qll increases2, the line voltage 8 drops, and the power supply becomes intermittent. This is transmitted to the transmitter by transmission numbers 4 and 17, and the situation of (-) is displayed by light emission from the light emitting diode LD1.

Note that the diode Dll is used to clamp the voltage of the non-common side line to the Zener voltage of the constant voltage diode ZD when the collector-emitter resistance of the transistor Qll increases by 1 or more.

On the other hand, resistor "1a=R□5, content C1l, transistor Q12, and diode I)12.Dl,
The receiving circuit is structured as follows: transistor Q1□
When is on, the telephone device i smell-C signal line LS□
When transmission is performed with the line-to-line impedance in a pulse-like manner, the terminal 'Ichikawa' of resistor R0 increases as the line-to-line impedance decreases, and the line side of resistor R□ becomes path-like. This is the content ゛C□
Passing through □ 1-2 is applied as a forward bias to the base of transistor Qxz, transistor Q12 is turned on, the current of Co1/74Σ is passed to resistor "14 + R15, and the terminal Ichikawa of resistor 1 (□5 is The operation data DR□ is given to the control unit CNT, and reception is performed by the control unit CNT. 1) R,
This is for clamping 1 beer candy with DC 11 source (-5V).

The control unit CNT also controls the error number 1 of the operation data DR1.
The error is monitored by parity check and each buffer match, and when an error is detected, the set signal R8T1 is set.
is generated as "H" for a certain period of time, and the output of inverter IN,2 is changed to "L", transistor Qll is turned on and the non-common 41111 line is connected to 1 through diode Dll.
It is connected to the common potential at ~, and the Ichihara supply is completely cut off for a certain period of time.

For this reason, the circuit of telephone T E L, 1 is 'W off]v
When the power supply is resumed after a certain period of time, the circuit is initialized and starts operating, thereby eliminating the volatile state.

As described above, the transmitter/receiver circuit 5RCI alternately transmits and receives signals to and from the 41st talk machine □, but the similar transmitter/receiver circuit SRC,
-5RC8 is provided for each faith line Lg B-Ls B, control data DS2-D≦i from each control unit, reset signal 1 (one response to ST2 to RST8, signal transmission to telephone device 2-8) In addition to performing a reset operation, operation data DR3 to I) R8 are sent out in response to transmission No. 17 from the telephone devices 2 to 1.

Note that the signal transmission and reception with the telephones TET, .

Figure 3) == (C) is 'Kimewarou T anus, - place,
8, (~ is the communication system, (B) is the signal system, (
C) indicates the possible I virtue signal system by the subject and l~, respectively, 1~, (B)
In (C) and (C), the control unit CT is duplicated for convenience.

A pure line terminal 'r connected to the 3 communication lines Lt at this X
'r, 'r'rs are connected to a telephone call circuit TKO via a hook switch H81, a diode bridge DB, and a dial circuit DIC, and when off-hook, a DC loop is closed by the telephone call circuit TKO. The dial circuit DIC, which operates using the loop current as a power source, can make a dial call, and the transmitter T and receiver R can make calls.

However, the dial circuit DIC is controlled by the light-receiving transistor of the photocoupler PC, and becomes operational only during a power outage of the commercial power supply AC.

Furthermore, on the line side of the diode bridge DB, a tone ringer TRG is bridge-connected via a hook switch H82, a capacitor C101, and a resistor RIO. Then, after generating a ringtone, the transformer T was installed. , and the transformer T which is connected in the same way through the contact p (O and the capacitor C).
lO2 is provided, which extracts the audio signal,
switch circuit 5Wlo1 and potentiometer RV,
. , to the amplifier A, where it is amplified and then driven to the speaker sp via the capacitor CIo8 and the contact pfl.

On the other hand, the signal lines are connected to the line terminals TS and ITS.
, are connected through a diode circuit for blocking the application of reverse polarity, a transistor Q111, a resistor R1111, a capacitor C1111+ClB2, and a constant voltage resistance.

A stabilizing circuit using the diodes zD121 is connected, thereby converting the power supplied from the main unit KSU to the local power supply +
After stabilizing it to 12V, it is supplied to each necessary part, and the output of this is further stabilized to local power supply +5V by the integrated circuit stabilization circuit REG, and the capacitor "T C
It is smoothed by l2B and then supplied to each part that requires it, and is similar to the control unit X of the main unit KSU, but the smaller control unit CT is also operated by the local power supply +5V. .

In addition, the reset terminal of the control unit CT is connected to a resistor R1□ connected in parallel with a diode wire for rapid discharge.
, the terminal voltage of the capacitor C1114 charged by the local power supply +5V is applied via the resistor R1118, and the capacitor C1g generated at the start of power supply
The terminal voltage rise delay of 4 is used as an "L" reset pulse, and in response to this, the control section CT performs the reset and initialization as described above.

In addition, a capacitor C86 is installed between the line terminals TS□ and TS. C, 6, resistors R1114 to R1119, diode D12B+D] transistor Q122, inverter IN121, input inversion type OR gate "G111
1, and a receiving circuit consisting of NAND gates G1g and l are connected, and an inverter l is connected between the connection point of the diode D12□ and the blocking wire CH and the common circuit.
N12i1, resistors R1al to R□85, and transistors Qlsa+Q2. A transmission circuit is connected to the transistor Q122, and the transistor Q122 is turned on in response to a drop in the line voltage v8 in response to the transmission from the main unit KSU, and the terminal voltage of the resistor R□, 6 becomes H'' due to the flow of collector current.
Then, the output of the inverters IN, , □ changes to L11, and the electric charges of the capacitors C0 and 6, which had been charged through the diode DI□, are discharged through the resistors R and 7 and the output impedance of the inverter INIII. Then, capacitor C, 6 and resistor R8. Since the terminal voltage of capacitors C0, 6 decreases to "L" according to a time constant determined mainly by the value of A flip-flop circuit (hereinafter referred to as FFC) consisting of G11ll and NAND gate G11ll is set. and resistor R1,.

"L" control data is applied to the boat terminal PIO of the control unit CT via the control section CT.

When the control unit 'CT confirms the control data, it changes the port terminal P6 to "Lo" and resets the FFC-FF, thereby preparing to receive the next control data.

In addition, according to the operation data, the boat P7 is moved in the shape of an “I”.
, 11, the output of the inverter lN11111 is W
.

As a result, the transistors Q0 and 8 turn on, and the transistor Ql14 also turns on, so that the line terminal T
S1. A resistor R18 is connected between the terminals TS2 and D1,1, and the inter-line impedance of the signal line L3 is lowered, thereby transmitting the fourth signal.

. As described above, signals are transmitted and received with the main unit KSU.A hook switch H88 is connected to the boat terminal P8 of the control unit CT, and the output of the keyboard KB is connected to the input terminal Ktl-3. At the same time, the output terminal 5O-83 has diodes Dlli1~■]lR4
The scanning power of the keyboard KB is connected through the , and the local power supply +5 is connected through the pull-up resistor r7c.
is the input force 1] Each terminal P8 which is set to "H'". K.O.
P8 in 3 becomes "L" in response to turning on of the hook switch "H8" to detect off-hook, and output terminals S〇-83 are sequentially set to "L" at a predetermined period to perform scanning, In response to this, the input terminal KO~3
Checks whether or not has become "L", and the dial keys *, #, 1 to 9.0 and the dial keys *, #, 1 to 9.0, the % hold key KH, and the office line key KLII are connected in a matrix.
It detects that KI and 2 are on, and encodes the operation data according to these operation conditions and sends it as described above.
Send the month and 1-C.

In addition, the output terminal s4 is connected to the resistor R15 through the transistor Q□51, and the output terminal 5l-83 is connected to the
Through the circuit of resistors R□, 2 to R15, respectively, I to transistors Q1.2 to Q15. is connected, and the timing is separate from the scanning for the keyboard Kf3.
The output terminal S4 is set to 'L゛° and the transistor Q15□ is turned off) ~, the light emitting diode "0101+LD102" corresponding to the local line key Kl, l1KL2, and the light emitting diode LD corresponding to 8 and A↑ to the local line key. When a power supply of 1-5V is applied, if the output terminal 5l-83 is set to L'' according to the I control data, the transistor Q15
2-Q154 turns on and resistor "158~R□6o
Light emitting diode LI) 1o1~LD
10 B emits light, and the same diode LD. 1. LDl
The continuous light emission from the diode LD10B indicates the capture of the station lines L□, L, and the same intermittent light emission indicates whether these lines are pending. ) displays the reception amplification status.

On the other hand, depending on the control data, the boat terminal P 5 + P
1 When +PLI is set to "L", the switch circuits 5w1o and -5w1o3 are turned on depending on the disconnection, and when the boat terminal P4 is "L", the transistor Qlf1lQ1?2 and the resistors R17□ to R□9 ．． The switcher circuit is driven, and the transistor Q17□ is also turned on due to the turning on of the transistor Q172, and the local 1d
Supply +12V to amplifier A1-1 and put it into operation.

Also, inverter lN17□-INB resistor R175
~R1,8 and capacitor C1゜1. Oscillators 08 each generate tone signals of different frequencies by C□72.
CI (IllO8C102 is configured, and NOR gate G17 is connected by ``L'' of boat terminals P2 and P3.
□1G171] is turned on, the tone signal passes through these, and the manual inversion type AM
When the switch circuit 5W1o2 is on, it is passed through the resistors R17Q and R180 to the amplifier A.
When the low level (1 speaker SP is driven and the switch circuit 5Wlo is on, the signal is transmitted only through the resistor "179")
is applied to amplifier A, which drives speaker SP with a high level.

In addition, depending on whether the switch circuit 5W1o□ is turned on, the main unit KSU sends out Z via the telephone line, the central office line ringtone, the incoming call from the door phone DRP, the self-ringing tone, the received voice, etc. from the speaker SP. Release δ, switch circuit 5W1
o2 still has 8W1o8 on and NOR game)
When G□7□ is turned on, a hold alarm sound, an off-hook alarm sound, and an alarm tone corresponding to the alarm signal AL are emitted from the speaker SP, and similarly, when NOR game 1-01° is turned on, For example, if you operate each gear in the gear board KB, the touch tone, extension ringtone, etc. will be emitted from the speaker SP, and if you connect NOR gate G1゜1lG172 at the same time, the busy ringtone will be the same. It can be released.

The difference between each emitted sound is NOR game) Gl? □.

It is determined by changing the on/off period of G□72 and setting the intermittent status.

In addition, there is also a terminal M+ for connecting to an external loudspeaker system.
Gl +1- is located in drawer 6 and supplies local power +12V through resistor '1tii, and resistor R'9
111R 0. The power supply return path is controlled by the switching circuit formed by the transistor 1 and the transistor 1, and when the output terminal S7 is set to "Lll", the transistor 1 turns on.
This depends on the operating state of the external loudspeaker system.

Also, while the local power supply +5V is being supplied, the output terminal S6, which maintains H1l, is connected to the inverter IN□9. It is connected to the input of the AC power supply, and when the commercial power supply AC is energized, the output of this becomes "Lll", and the transistor resistor 2 is turned on through the circuit of the resistor R06. Diode D
00, operates the relay PF connected in parallel, and energizes the light emitting diode of the photocoupler PC through the resistor R, 6, and its light emission causes the photocoupler PC to emit light.
The light receiving transistor is turned on, and the operation of the dial circuit DIC is stopped.

In addition, in response to the operation of relay PF, contact p x O is turned on and contact pf2 is in a state to select the output of amplifier A, and switch circuit SW. ,~SW Eng. 8 turns on, the speaker SP can be driven as described above, but if the relay PF is restored due to a power outage of the commercial power supply AC, the contact pfO turns off and the contact pfs selects the output of the tone ringer TRG, and the main device Only in response to an incoming call from the central office line L□ or LINE directly connected at KSU, the speaker SP is driven, and the dial circuit DIC is activated in response to the dimming of the light emitting diode of the photocoupler PC.
becomes operational, and if you operate the dial key on the keyboard KB after going off-hook, a separate contact provided on it will turn on and send out a dial signal in the form of a pulse signal or composite audio frequency signal, so it can be used even during a power outage. You can freely make and receive calls to and from the central office line L1 or L2.

Dial circuit DIC, )-ringer TRG.

The relay PF and its peripheral circuits may be provided only in the power outage telephone.

FIG. 4 is a diagram showing the signal transmission situation between the main unit KSU and the telephone terminal TF, L8. First, the main unit KSU transmits a polling signal PR to the horizontal telephone 1, and Place the phone horizontally accordingly.

When a response signal X indicating operation data is transmitted from , upon reception of this, the main unit KSU transmits a control signal Y indicating control data to the horizontal telephone □, and these transmissions and receptions are carried out by the horizontal telephone □. In addition, the above transmission and reception are repeated at a constant period t.

FIG. 5 is a waveform diagram showing in detail a series of polling signals PR to control signals Y. Transmission from the main unit KSU is such that the line voltage v8 of the signal line Ls decreases by v0, but when the telephone is placed horizontally, In the transmission, the line voltage Vs is reduced by only v2.

In this case, the polling signal PR is composed of a 3-pit pulse signal, and the response signal X is composed of a 2-pit start signal ST, a synchronization pit SY, and a data bit D, respectively. -D Consists of bytes Xi and X2 consisting of data bits PY and data bits)D. −
D6 is coded according to the operating situation, and becomes the data bit D accordingly. Insertion or non-insertion of -D6 is defined. For example, insertion indicates a logical value of "1" and non-insertion indicates a similar "θ". With byte X2, data bit D.

Insertion and non-insertion of ~D6 are reversed, and even if the codes indicated by each are the same, each pi)XI and X2 are transmitted with opposite phases to each other.

The control signal Y is composed of a 2-bit start signal S, and bytes Y1 to Y3, each consisting of a synchronization bit SY, a data bit Do-D, and a parity bit PY, and each control signal has a total of 21 data bits. For example, a logical value is indicated depending on insertion or non-insertion as described above, and this logical value “1”
Control items are set to be executed according to °°.

Therefore, the operating data of the telephone is indicated by the codes XI, X2, and each data bit D of bytes Y1-Y3. -D6 indicates control data, and includes control items and each data bit D of bytes Y1 to Y3.
. The correspondence relationship with -D6 is, for example, the data pin of Pi1-Y1=Y3 corresponding to the control item) -Do~・D6
The control data is shown by , and in the control section CT on the telephone side, each pie) Yi=Y3 and data bit D.・・I〕
By simply counting the 111th position of 6 and determining its status, control according to the control data can be performed, and the procedure for deciphering the control @l data Shuji can be simplified.

In decoding the control data, the presence or absence of an error is determined based on the star signal ST and the synchronization bit SYf: reference stitch (counting and parity bit) PY.

In addition, in the main device I/U,
After setting the phases of i and X2 to be the same, it is determined whether or not each bit (XI and
In response to a match, it is detected that each of the received bytes XI and X2 is a regular signal, and a response is taken accordingly.

Then, the main unit KSU receives the reception number X as mentioned above.
If an error is detected, the transmission of the control unit +'3Y is stopped and the process moves on to transmitting the polling signal PR, to the next telephone, and the telephone transmits the response signal X and then If the control signal Y cannot be received within a certain period of time, it is determined that an error has occurred in the own transmission No. 4, and polling is performed for the self at the next cycle t.
) R is received, in response, a response signal X indicating the same operation data as the previous one is retransmitted.

FIG. 6 is a flowchart showing the transmission control by the processor cpI-y of the KSU.
After performing the corresponding response signal "x Reception" 102, using the above-mentioned method, the "Error Check" 103 determines whether there is an error. ” Judge 104, and if the answer is No, the system is 5M!'+M “Y Send” 10
5, but if YES, skip step 105 [
7. Immediately move to step 101 via NO in the telephone "Place □-Place?" 106 17. Perform "send yen" 101 on the polling section for the next telephone device 2 until step 106 becomes YES. Telephone TF2L,
-Reverse similar transmission control for rgi, 8.

Also, if step 106 is YES, after performing "received data processing" 107, the "next polling" is performed using the time amplifier of 1 (-1). When should we start?”
For example, 98.1m as 10B becomes YES.
Step 101 and subsequent steps are repeated with a period t of 5ec.

FIG. 7 shows the control section CT of the telephone 'rEL1-8 (7).
Transmission control is controlled by the process engine installed inside.
(5) is the main routine, (B) is the interrupt routine, and (in N, for example, 6rn+
The operation data taken in at the cycle of lec is sent to the buffer area provided in the memory of the Mi control r, %1LCT, and the "transmission data set" 201 is performed, the "polling standby flag set" °202 is performed, and the polling signal is sent. ``PR reception completed?'' 203 is YES and L
For example, a response signal "x transmission" 204 is performed according to the contents of step 201, and a control signal "Y reception completed?" 2
In response to YES in step 05, the "received data processing" 206 performs control based on the control data, and then the "period timer/time amplifier 7 configured to monitor the period t" is activated.
If "207" is YES, "reception error flag/sen)?"``20B'' is assumed to be NO, ``transmission data center'' 209 is performed on the buffer area, the contents thereof are updated to the latest ones, and steps 202 and subsequent steps are repeated.

In response to the above, if an error occurs in the response signal X and the control signal Y cannot be received, step 205 is N.

Then, the control signal “Y standby timer time up 7”
In response to Y8 of ``211, it is determined that the control signal Y could not be received within a certain period of time, and ``reception error flag setting 212'' corresponding to step 20B is performed.

Therefore, step 208 becomes YES, and the previously transmitted data is re-sensed to the buffer area mentioned above.
221, "reset reception error flag" 222 corresponding to step 212 is performed, the process returns to step 202, and step 204 corresponding to the BS in step 203 retransmits the response signal X with the same content as the previous time. do.

In (B), interrupt processing is performed in response to the polling signal PR, the start signal ST of the control signal Y, and the synchronization signal SY. First, when the polling signal PR arrives, step 202 " Wait flag ″′
Since "Polling standby?" 301 is YES, a polling signal "PR reception" 302 is sent, and the number of bits and pulse interval of this is checked.
If the polling signal "PR OK?'" 303 is...S, "period timer start" 304 corresponding to step 207 is performed, and then "polling standby flag reset °" 305 corresponding to step 202 is performed. After that, a polling signal "PR reception end flag (sen)" 306 is sent, and the process moves to step 204.

Note that NO in step 303 is equivalent to NO in step 203.
corresponds to

If step 301 is determined as NO, each pie)
The control signal “Y
Reception" 311 is made, and the same signal "Y reception completed? "31
In response to YES in step 2, the signal "Y reception end flag is set 313, and the process moves to step 206.

Note that if step 312 is NO, step 211
, and repeat the same route until it becomes YES.

Therefore, even without using confirmation signals such as ACK and NACK signals, the telephone equipment 8 side can determine that an error has occurred in its own transmitted numbers, and it will transmit the same content in response to receiving the next polling signal. The operation data from telephone units 1 to 8 can be transmitted to the main unit KSU without being lost, and the response of the main unit KSU can be ensured, and no special confirmation signal is used. , the overall transmission time is shortened, the response of the main unit KSU is quick, the chances of noise being mixed into the signal are reduced, malfunctions are less likely to occur, and the transmission control conditions are simplified. becomes.

Alternatively, the signal lines -1 to L8B may be made common, and an address code for each telephone set may be added to the polling signal PR, and the configuration of each signal X and Y may be determined according to the conditions. It is also optional to transmit the control data in the same format as the transmission of the operation data.

Further, the pulse signal shown in FIG. 5 may be not only a decrease in the line voltage vs, but also an increase or an intermittent increase in the line voltage v8, the same effect can be obtained by modulating an alternating current signal and superimposing it on the power supply, or Various modifications are possible, such as supplying power through separate lines.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the overall transmission time is shortened, the response of the main device is quick, and operation data on the telephone side is transmitted to the main device without being lost. The response of the device is ensured, the transmission control conditions are simplified, the reliability of the device is improved, and remarkable effects can be obtained in various key telephone devices.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a block diagram of the main device, Fig. 2 is a circuit diagram of the transmission section in Fig. 1, Fig. 3 is a circuit diagram of a telephone, and Fig. 4 is a signal transmission diagram. 5 is a diagram showing the waveform of the transmission signal, FIG. 6 is a flowchart showing the transmission control situation by the processor of the main device M,
FIG. 7 is a flowchart showing the transmission control situation by the telephone processor. KSIJ...Main device, Lsl-"s8...Signal line, TEI, □~position 8...Telephone (button phone), CNT, CT...Control unit, CPIJ... Processor, SR...Transmission section, R11~■(□6TR
Yo, 1-Rl8. ...Resistor, C1l...Condenser, Qlx+Q12+(hza+Qu4...
l・Rani/Jister' lN122...Inverter, PR...Polling signal, X...Response signal, Y...Control signal. Patent applicant: Tamura Shinki Seisakusho Jl. Yayama Kazukai (eυ) 2 people) Figure 7 (A) (E3) 221 - ノ 222

Claims (1)

[Claims] The main device sequentially transmits a polling signal to a plurality of key telephones, receives the corresponding transmission No. 4 from the button telephone, and after receiving this, transmits transmission No. 4 to the button telephone. , in a key telephone device that repeatedly and periodically transmits and receives these signals to each key telephone, the main device monitors an error occurring in transmission number 4 from the key telephone, and detects the error. In response to the detection, the transmission of transmission No. 4 to the key telephone is stopped and the transmission of the polling signal to the next button telephone is started, and in the case of the button telephone which has not been able to receive transmission No. 4 from the main device, the next transmission is performed. A signal transmission system for a button telephone device, characterized in that, in response to the reception of the polling signal, a transmission number 4 having the same content as the previous time is transmitted.