JPH036952A - Communication control equipment - Google Patents

Abstract

PURPOSE:To attain both communication with a computer by means of a basic protocol and with a terminal equipment by means of a TTY protocol through one line and to reduce the cost by providing an internal protocol deciding section and a protocol conversion section. CONSTITUTION:A network control section 11 has relay control function and a MODEM function through the detection of an incoming call from a line, converts an analog signal from a line into a digital signal and transmits the signal to a protocol deciding section 12. Moreover, the network control section 11 receives a digital signal from the protocol deciding section 12 conversely, converts it into an analog signal and sends the signal from the line. The protocol deciding section 12 decides whether the protocol is the 300bps, 8bit/char basic protocol or the 200bps, 50bit/char TTY protocol. Then the controller can communicate with both the 300bps, 8bit/char basic protocol and the 200bps, 5bit/char TTY protocol.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a communication control device that controls a computer using a telephone line.

Conventional technology As a system that uses a telephone line to control a computer, it automatically reports LP gas meter readings, etc. to the center at regular intervals, and reports emergency information such as gas leaks to the center. There is a system to do that. This information input from the terminals is managed by the center computer via the communication control device.

The terminal in this type of system has a speed of 300 bps, 8
A device with a basic procedure of 300bps, 300bps and 300bps is used.
It only had a modem function for BLT/Char data.

Problems to be Solved by the Invention However, in the above system, two terminals are used.
00bps, 5b I t/char. It is also possible to use a centrally monitored microcomputer meter with a TTY procedure interface, but it cannot be connected to a conventional communication control device because the interface conditions are different, and two lines are required for connection. This resulted in an increase in costs.

The present invention solves these conventional problems,
The interface conditions with the center computer remain the same, and 300 bDS is available on one line.

8bit/char, , basic procedure terminal and 200bps, 5bit/char. ，
It is an object of the present invention to provide an excellent communication control device capable of communicating with both terminals of the TTY procedure.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention includes a protocol determining section connected by ffI between a lozenge section connected to a line and an interface section connected to a computer, The apparatus includes a protocol conversion section connected to the determination section.

300 bps from the line, 8 blt/char.

, when a basic procedure signal is input, the protocol determination section outputs it as is to the interface section, and sends a signal of 200bczi, 5bit/char. ,TTY
When a procedure signal is input, the protocol determination section sends it to the protocol conversion section at 30Qbps, 8bl t, /
char. , converted to a basic procedure signal and output to the interface section.

Operation Therefore, according to the invention, if the terminal is 200bps, 5b
f t/char. , 300bos, 8bIt/char. , communication is performed using the basic procedure, so it has the advantage that two types of terminals with different communication procedures can communicate over one line.

Embodiment FIG. 1 is a block diagram showing essential parts of an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a network control section, which has relay control and modem functions by detecting incoming calls from the line, converts analog signals from the line into digital signals, and transmits the digital signals to the protocol determination section 12. Conversely, it receives a digital signal from the protocol determining section 12, converts it into an analog signal, and sends it out through the line. The protocol determination unit 12 uses 3QQbps, gblt/char.

, basic procedure, 200bps, 5b I t/c
har. , determine whether it is a TTY procedure. If it is the former, it is transmitted as it is to the R3232C interface section 14 and communicated with other equipment such as the center computer, and if it is the latter, it is transmitted at 300 bps in the protocol conversion section 13.
, 8bit/ahar1. The data is converted into a basic procedure and sent from the R3232C interface unit 14 to the center computer. In addition, the protocol determination unit 12
The R3232C interface section 14 to 300b
ps, 8b lt/char. , the data sent through the basic procedure is 200bos, 5b I t/c
har. , TTY procedure, and sent to the line via the punishment control unit 11.

FIG. 2 shows the configuration of an embodiment of the present invention in more detail. 21 is a telephone attached to this communication device, and 22 is a line. 23 is NCU (g control 111 section)
and is connected to a modem 25 via a data bus 24. Further, the NCU 23 and the modem 25 are each connected via data buses 26 and 27 to a microcomputer 28 that controls this communication device. The microcomputer 28 has a human output unit 28a and an NCU system W*2.
8b, protocol determination unit 28c, protocol conversion unit 28
d and an R3232C control section 28e. The microcomputer 28 connects the R3232 via the data bus 29.
The R3232C interface section 30 is connected to a center computer 32 via a data bus 31. 33 is a power supply section, which is connected to an external tFA via a plug 34.

Next, the call response operation in the above embodiment will be explained. In Figure 2, when there is an incoming call from line 22, the NC
U23 transmits its status to microcomputer 28 via data bus 26. microcomputer 28
The NCUmIII section 28b inside receives a signal from the input/output 'ff28a, detects its state, and passes the control to the R3232C control section 28e. The RS 232 CII controller section 28eCI (called indicator) is turned on and the information is sent to the R3232C interface section 30 via the data bus 29. The center computer 32 is further connected to the R3232C interface section 30 via the data bus 31.
When the information is transmitted to the center computer 32
returns the CIC (incoming call connection), and in turn that information is transferred to the data bus 31, R3232C interface section 30.
It enters the input/output section 28a of the microcomputer 28 through the data bus 29, and enters the NCUfli'1JIII section 2.
8b connects the line 22 and the NCU 23 via the modem 25.

Next, the FSK signal from the terminal is converted to a baseband signal by the modem 25 via the NCU 23, and transmitted from the data bus 27 to the protocol determination section 28c via the human output section 28a of the microcomputer 28. The protocol determination unit 28c determines whether the sent data is 200bos or 5b.
It/char. , data, 300bps, 8b
i t/char6. 200b
ps.

5blt/char. , the protocol conversion m 28 d 300bpS, 8bit t/
char. , protocol conversion to data of R3232
The data is transmitted from the C control section 28e to the center computer 32 via the input/output section 28a, the data bus 29, the R3232C interface section 30, and the data bus 31. The response message is sent to the center computer 32.
When the data is sent from the R5232C interface unit 30, the protocol conversion unit 28d converts it to 2QQbps, 5bit/char. , and sent to the modem 25 via the data bus 27. The modem 25 performs FS modulation on this and sends it out to the line 22.

FIG. 3 shows the sequence when the communication control device does not convert the protocol. A transmission request from the terminal side is made by P, enq, the communication control device sends it to the center computer, and the communication control device sends it to the center computer. returns DLE and ACK.

FIG. 4 shows a sequence for protocol conversion, in which a transmission request from the terminal side is made using a dummy code directed to the communication control device.

Effects of the Invention As is clear from the above embodiments, the present invention includes an internal protocol determining section and a protocol converting section, so that the communication speed with the computer is 300 bps.

8bit/char. , 300bps, 8bit T/C as a terminal without changing the basic procedure
har. , 200bps with basic procedure,
5btt/char. , and those having TTY procedures can be performed on a single line, and costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the main parts of a communication control device in an example of the present invention, Fig. 2 is a schematic configuration diagram of the same device, Fig. 3 is a sequence diagram of the same device when protocol conversion is not performed, and Fig. 4 is the same. FIG. 3 is a sequence diagram when converting a device protocol. 11... Network control unit, 12... Protocol determination unit, 1
3...Protocol conversion unit, 14...R5232C interface unit, 22...Line, 28...Microcomputer, 32...Center computer.

Claims (1)

[Claims] A protocol determination unit connected between a network control unit connected to a line and an interface unit connected to a computer, and a protocol conversion unit connected to the protocol determination unit.
ar. , when a basic procedure signal is input, the protocol determination unit outputs it as is to the interface unit, and transmits the signal to the line at 200 bps, 5 bits/cha.
r. , when a TTY procedure signal is input, the protocol determining unit transmits this to the protocol converting unit 300b.
ps, 8bit/char. , a communication control device that converts the signal into a basic procedure signal and outputs it to the interface section.