JPS63128856A - Control system for communicating equipment - Google Patents

Abstract

PURPOSE:To control the communicating equipment to vary easily a signal sending level by providing a signal sending level setting means to set the signal sending level to a multi-step and changing the set value of the level by a command from an opponent equipment. CONSTITUTION:For an attenuating circuit 23, by the output data of respective bits of a register 24, respective analog switches 23a-23d are turned on and off, the attenuating quantity of the attenuating circuit 23 is set and a signal sending level is determined. The register 24 stores signal sending level setting data DOT added from the CPU of a facsimile equipment with the timing outputted by a writing signal WR. The level setting data DOT are stored into the prescribed storage area of a RAM. The CPU, when the facsimile equipment is activated and the contents of the storage area of the RAM to store the level setting data DOT are re-written, reads the level setting data DOT stored into the RAM and writes them into the register 24.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a control method for a communication device that uses an analog line network as a communication line.

[Prior art] For example, in a communication device such as a facsimile machine that uses a public telephone line, which is an analog line network, as a communication line, a signal is sent to the line at a level corresponding to the loss of the connected signal line (line). There is a need.

For example, if the signal transmission level is small relative to the line loss, the facsimile machine on the other end to which the facsimile machine is connected via the public telephone line will not be able to obtain a signal of sufficient level.

Appropriate data communication will no longer be possible.

For this reason, conventionally, a terminal for setting a signal sending level has been provided in the circuit of a facsimile machine, and the signal sending level can be changed by switching the terminal using a jumper wire or the like.

However, with this conventional method, when changing the signal transmission level, a service person has to go to the facsimile machine and dismantle the facsimile machine so that the jumper wire can be switched, which is a time-consuming and time-consuming problem. was occurring.

[Objective] The present invention was made in order to eliminate the disadvantages of the prior art, and an object of the present invention is to provide a control system for a communication device that can easily change the signal transmission level.

[Configuration] In order to achieve this object, the present invention includes a signal transmission level setting means that can set the signal transmission level in multiple stages.
The set value of the signal sending level setting means can be changed by a command from a partner device connected via a communication line.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a facsimile machine according to an embodiment of the present invention. This facsimile machine.

It can be applied to both the calling station and the called station, which will be described later.

In the figure, a scanner 1 reads an image of a transmitted document at a predetermined resolution, and a plotter 2 records and outputs a received image at a predetermined resolution.

A CPLI (Central Processing Unit) 3 controls the entire facsimile machine and executes predetermined transmission control procedure processing, and its execution program is stored in a ROM (Read Only Memory) 4, and its work area and Storage area for various setting data.

It is formed in a RAM (random access memory) 6 backed up by a battery 5. In addition.

Instead of this RAM 6, any nonvolatile semiconductor memory device can be used.

The buffer memory 7 is used to temporarily store transmitted and received data, and the operation display section 8 consists of various operation keys and a display with a large degree of display flexibility for displaying operation guidance information, etc. is for operating this facsimile machine. The operation keys include a mode key for specifying various operation modes, a guidance key for making a selection corresponding to the guidance display, and the like.

The encoding/decoding unit 9 has the function of encoding and compressing image data and decoding the encoded and compressed image data into the original image data, and the modem 10 transmits data through a public telephone line, etc., which is an analog line network. It modulates and demodulates digital data so that it can be used as a line, and the network control device 11 connects the facsimile device to the public telephone line network. Note that this network control device 11 has an automatic call originating and receiving function.

These scanner l-plotter 2, CPU 3,
ROM4. The RAM 6, buffer memory 7, operation display unit 8, encoding/decoding unit 9, and modem 10 are connected to a path line 12, and data exchange between these elements is via this path line 12. It will be done.

Now, the modem 10 has a built-in attenuator for switching the signal transmission level.
As shown in the figure.

The attenuator 20 includes an operational amplifier 21 that receives an output signal from the modulation section of the modem 1O, and a network control device 11 that transmits the signal.
It consists of a buffer amplifier 22 for transmitting signals to the buffer amplifier 22, an attenuation circuit network 23 provided between the operational lamp 21 and the buffer amplifier 220 to attenuate the signal level, and a register 24 for storing data for setting the amount of attenuation of the attenuation circuit network 23. .

The attenuation circuit 23 includes analog switches 23a, 23b, 2
3c.

23d and appropriately weighted voltage dividing resistors R1, R2,
It consists of R3゜R4 and R5, and each analog switch 23 is controlled by the output data of each bit of the register 24.
a.

23b, 23c, and 23d are turned on and off, thereby setting the amount of attenuation of the attenuation circuit 23 and determining the signal sending level. For example, when each analog switch 23a, 23b, 23c, 23d is turned on,
ldB, 2dB, 4dB, 8dB respectively
In this case, the attenuation amount can be set in 16 combinations.

Further, the register 24 stores the signal output level setting data DOT added from the CPU 3 at the timing when the write signal Fuki is output. This signal sending level setting data DOT is stored in a predetermined storage area of the RAM 6, and when the facsimile machine is started, the CPU 1 uses the RAM that stores the signal sending level setting data [)OT.
When the contents of the storage area 6 are rewritten, the RAM
The signal sending level setting data DOT stored in the register 6 is read out and written in the register 24.

Now, in order to change the signal sending level of this facsimile machine, it is sufficient to rewrite the contents of the storage area of the signal sending level setting data DOT in the RAM 6.

Therefore, in this embodiment, an external device (for example, a center office of a service station, etc.)
The memory contents of AM6 can be arbitrarily rewritten, and the signal sending level can be changed from an external device. Furthermore, the contents of the RAM 6 of this facsimile machine can be read out at will, so that the signal transmission level can be known by an external device.

In this case, an external device having the same configuration as this facsimile device is used. However, such a function that allows arbitrary access to the RAM 6 of the other party's facsimile machine can be prohibited as appropriate, and the function is prohibited if it is used for a station other than a predetermined center station.

The central office of the service station receives the user's facsimile machine (hereinafter referred to as
When changing the signal transmission level of a user station (referred to as a user station),
As shown in FIG. 3, the center station first calls its user station.

As a result, the user station responds with the called station identification signal CHD, and then responds with the non-standard equipment signal NSF and the digital identification signal DIS to the center station.

If the non-standard equipment signal NSF indicates that the center station has the function of rewriting the memory contents of RAM6, the center station shall notify the non-standard equipment that the memory contents of RAM6 are to be rewritten and that such rewriting may occur subsequently. RA to be rewritten at that time in the standard device setting signal N5Sun
Add data to rewrite the storage area of M6 with hail address data and send it to the user station.

As a result, the user station rewrites the data in the storage area of the RAM 6 indicated by the address data added to the received non-standard device setting signal N5Sun with the transmitted data. Then, reception preparation confirmation signal C
FR is responded to the center station.

Upon receiving this reception preparation confirmation signal CFR, the center station transmits the non-standard device setting signal N5Sun in the same way as described above when rewriting continues, and when transmitting the last data to be rewritten, it rewrites the memory contents of RAM 6. Address data indicating the storage area of the RAM 6 to be rewritten at that time and data to be rewritten are added to the non-standard device setting signal NSSwa, which warns that the rewriting is completed, and transmits the data to the user station. When the transmission of all the rewritten data is finished, a line disconnection command CN is sent to restore the line.

Therefore, by rewriting the contents of the storage area of the RAM 6 that stores the signal transmission level setting data DOT using the non-standard device setting signal N5Sun or the non-standard device setting signal N5Sva, the signal transmission level of the user station can be changed as appropriate. be able to.

In addition, in the above-mentioned procedure, the train failure signal FTT may be made to respond instead of the reception preparation confirmation signal CFH.

When the center station checks the signal transmission level of a user station, the center station first calls the user station, as shown in FIG.

As a result, the user station responds with the called station identification signal CED, and then responds with the non-standard equipment signal NSF and the digital identification signal DIS to the center station.

If the non-standard device signal NSF indicates that the center station has the function of transmitting the memory contents of RAM6, the center station transmits the non-standard device setting signal N5Srr that instructs to transmit the memory contents of RAM6. When necessary, the start address data and end address data of the requested storage area are added and sent to the user station.

As a result, the user station uses the non-standard device setting signal N5Srn or the non-standard device setting signal N5Sre to transfer data in the storage area indicated by the first address data and the last address data added to the received non-standard device setting signal N5Srr. , one address at a time, is sent to the center station sequentially. Here, the non-standard device setting signal N5Srn
is used when transmission data follows, and the non-standard device setting signal N5Sre is used when transmission data follows.

Used when transmitting final address data.

In this way, when the non-standard device setting signal N5Srn or the non-standard device setting signal N5Sre is sequentially transmitted, the center station responds to the user station with a reception preparation confirmation signal CFR each time.

Then, when the transmission of all the rewritten data for the final address is completed, the user station transmits a line disconnection command DCN to restore the line.

Therefore, by the non-standard device setting signal N5Srr,
RAM that stores signal transmission level setting data DOT
By selecting the storage area No. 6, the signal transmission level of the user station can be confirmed at the center station.

In addition, in the above-mentioned procedure, the train failure signal FTT may be made to respond instead of the reception preparation confirmation signal CFH.

In this way, the signal transmission level of the user station can be checked and changed at the center station, so that the effort required to change the signal transmission level can be greatly reduced.

Note that the attenuator in the above embodiment is as follows.

Although the attenuation amount can be set in 16 ways, other combinations of attenuation amounts are also possible. Also,
The attenuator may be built into the network control device 11.

Further, the present invention can be similarly applied to communication devices other than facsimile devices.

[Effects] As explained above, according to the present invention, the present invention includes a signal sending level setting means that can set the signal sending level in multiple stages,
Since the set value of the signal sending level setting means can be changed in response to a command from the partner device connected via the communication line, there is an advantage that the signal sending level can be easily changed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an outline of a facsimile machine according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of an attenuator, and FIG. 3 is an example of a transmission procedure when changing the signal transmission level. FIG. 4 is a time chart showing an example of a transmission procedure when transmitting a set value of a signal sending level. 3... CP direct central processing unit), 4... ROM (read only memory), 5... battery, 6...
RAM (random access memory), 20...attenuator. Agent Patent Attorney Crest 1) Makoto No.-7' Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] In a control method for a communication device that uses an analog line network as a communication line, it is equipped with a signal sending level setting means that can set the signal sending level in multiple stages, and the signal sending level is adjusted according to a command from a partner device connected via the communication line. A control method for a communication device, characterized in that a setting value of a setting means is changed.