JPH0257052A - interface device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a car phone interface device for a data transmission device used when connecting a data transmission device to a car phone device.

[Prior Art] A car telephone device is composed of a radio device and a handset, and the two are usually connected by ten signal lines.

Generally, when connecting a facsimile device to such a car telephone device, an interface device 3 is disposed between the wireless device 1 and the handset 2, as shown in FIG.
The facsimile device 4 is connected to the interface device 3.

The interface device 3 connects the wireless device 1 and the handset 2 during a call, and connects the □ signal lines necessary for facsimile communication among the 10 signal lines mentioned above during facsimile communication. By the circuit 31,
It is necessary to switch to connect to the facsimile machine 4 side.

This switching is performed manually by an operator or automatically by a control section of the facsimile machine.

[Problems to be Solved by the Invention] As signal lines that require switching as described above, in addition to the transmission/reception signal lines, there are also "-reserial signals from Pan 1 to Set 1-2 toward the wireless device 1, and Each line has a downstream serial signal in the opposite direction. These serial signals are used to exchange operating status and control information of the devices between the wireless device 1 and the devices 1 to 1-2.

For example, the up serial signal has dial information that is the destination@phone number, and the F serial signal has reception level information that indicates the reception level of radio waves. The wireless device 1 is
Based on the dial information, a call is made to a predetermined destination. Further, the display unit of the hand cell l-2 displays the reception level based on the reception level information 1-.

By the way, for example, suppose that during the transfer of the dial information and reception level information, the ``sinch circuit 3'' is switched by manual operation or startup operation of the facsimile machine for facsimile communication.

Then, the transfer of that information will be interrupted midway, so
The call may not be sent to the correct destination, or the call may not be sent to the correct destination.
-2 reception level is not displayed correctly.

In this way, in the past, there was a problem in which the car telephone device malfunctioned when switching from a call state to facsimile communication while information was being transferred using each serial signal down the J-Yuri. limited to equipment,
The same applies to other data transmission devices. The present invention solves the above problems and provides a car phone interface device for a data transmission device that can prevent malfunctions of the car phone device when switching to data transmission. Providing a surface is [i-purpose].

[Means for Solving the Problems] For this purpose, the present invention provides communication between a wireless device and a huff 1 during a call.
A transmission path for the transmission signal and the reception signal is formed between the wireless device and the data transmission device. While switching the signal line to
In between, it forms a transmission path for each downlink serial signal, and also forms part of the information necessary for the operation of the data transmission device among the information transferred by each serial signal during data transmission. This feature is characterized in that the data is extracted and transferred to the data transmission device.

[Operation] Since each serial signal up and down between the wireless device and the handset 1 is constantly transmitted, at the timing of
Even when switching from a call state to data transmission, the information transferred by the serial signal will not be interrupted midway. This makes it possible to prevent malfunctions of the car telephone device.

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

FIG. 1 shows a facsimile communication system a according to an embodiment of the present invention.
This figure shows a diagram of the flock structure of Syshum. In the figure, the wireless device of the car telephone device and the interface device 3, and the interface device 3 and the wires 1 to 2 are connected to a cable 5 each having 10 signal lines.
．． It is connected from 6 points.

Further, a facsimile device 4 is connected to the interface device 3 through several signal lines 7.

In the interface device 3, the common terminal c1 of the switch circuit 32 is connected to the wireless device 1 side, one contact a□ is connected to the handset 2 side, and the other contact b is connected to the transmission signal TD line of the facsimile device 4 side. is connected.

In addition, the common terminal c2 has one contact on the wireless device 1 side,
] 2 is connected to the receiving signal RD line of the pan 1-seno 1-2 side, and the other contact b2 is connected to the receiving signal RD line of the facsimile machine 4 side.

The CPU 33 and serial devices 1034 and 35 exchange uplink serial signals SU and downlink serial signals SD between the wireless device 1 and the handset 2, and among the information transferred by these signals, transfer information necessary for the operation of the facsimile device W4. This extracts some information and outputs it to the facsimile machine 4.

Serial number 1034 is on the wireless device 1 side, serial number 1034.
35, each line of an uplink serial signal SU and a downlink serial signal SD on the handset 2 side is connected. Then, from the CPU 33, reception level data L
. -L3 and hook switch on/off data 11 are output to the facsimile machine 4.

The above reception level data L. -L3 is extracted from the downlink serial signal SD and indicates the strength of the received radio wave. The on/off data 11 is extracted from the uplink serial signal SU and indicates the on/off state of the hook switch of the handset 2.

Further, in the wireless device 1 and the handset 2, each signal line including a power source and a ground other than the transmitted/received signal and each serial signal SU and SD is connected to each other via an interface device 3, respectively. Of these, the power supply and ground lines are connected to the interface W3.

On the other hand, within the facsimile machine 4, a scanner 41 reads an original image and extracts image information of a predetermined resolution, and a plotter 42 records the image information on recording paper. The encoding/decoding unit 43 encodes image information to be transmitted and decodes received image information.

The image memory 44 temporarily stores image information.

The modem 45 modulates and demodulates image information and transmits the same, and also transmits various procedure signals in transmission control procedures. Between this modem 45 and the interface device 3,
It inputs and outputs the transmission signal TD and reception signal RD. The communication control unit 46 executes predetermined transmission control and executes facsimile communication.

The operation display section 47 is used to display the operating status of the device and perform various operations for transmission and reception.

The system control section 48 is composed of a microcomputer system, and controls each section mentioned above to execute predetermined operations of the facsimile machine. A connection switching signal EX for switching connections is output from the system control unit 48 to the switch circuit 32.

With the above configuration, while the car telephone device is in operation, the wireless device 1 outputs the down serial signal SD, and the handset 2 outputs the up serial signal Sυ.

Each serial signal SD, SO has a start bit ST and 8-bit data D, as shown in FIG. -D
7, a parity bit P, and a stop bit SP.

Furthermore, when the reception level information is indicated by the downlink serial signal SD, as shown in FIG.
"0011" is set in 4 to D7, and data D. -D
3 is reception level data L. -L3 is set.

This reception level data L. -L3, as shown in FIG. 3(c), each section is set in increments of 2 dBμ, with a reception level of 1 dBμ or less being "oooo" and a reception level of 30 dBμ or higher up to "1111'".

Further, when the hook switch information of the handset 2 is indicated by the uplink serial signal SO, "100101" is set in the data D2 to D7, and the data D is set as "100101" as shown in FIG. Bit X indicates the on/off state of the hook switch. When this bit X is ``1'', it indicates an off-hook state in which a DC loop of the telephone line is formed, and when it is II OII, it indicates an on-hook state in which the DC loop is open. At this time, bit Y of data D□
When the value is "1", the handset 2 is in a raised state, and when II Or+, the handset is in a lowered state.

Since power is supplied to the interface device 3 from the wireless device 1, the CPU
33 and serial l1034.35 also work.

Figure 3 shows the signal flow at this time.
U33 manually inputs the downlink serial signal +38D output from the wireless device via serial number 1034, and converts the serial signal into a parallel signal.

Then, by serial ■/○:35, it is converted into a serial signal again and outputted to the handseras I to 2 as a down serial signal SD. Further, when the reception level information shown in FIG. 2(b) is indicated in the downlink serial signal SD, the CPO 33 outputs the reception level data I. ~L, is extracted and output to the facsimile machine 4.

Further, when the hook switch information shown in FIG. 2(d) is indicated in the uplink serial signal SU, this is outputted to the facsimile machine 4 as on/off data F (on/off data F).

Usually, the switch circuit 32 is connected to the contact ax+az side. In addition, wireless device 1 and Huff 1 to Setsu 1 to 2 M
The up and down serial signals SIJ and SD of ll are the CPU 3
3 and serial numbers 1034 and 35. As a result, by performing predetermined operations in Handl to Setl-2, it is possible to dial the other party and make a telephone conversation.

FIG. 4 shows the transmission operation of the facsimile machine 4. In this case, the operator first scans the original to be sent to the scanner 41, then calls the other party with Huff 1 and 2. Press the star 1 button on the operation display section 47.

When the star h button is pressed (Y in process 101), the facsimile machine 4 displays the fx inch information.
-11 to determine whether it is in an off-hook state (processing 1
02).

Here, if the on-hook state (processing 102
(N), the line connection with the other party has not been made, which is considered to be an erroneous operation, so an alarm sound is output from a speaker (not shown) to alert the operator (process 103).

Furthermore, when the device is in an off-hook state (Y in process 102),
Receiving (=processing to output J sound 104), switch circuit 32
Contact 0. b, , side (process 105).

Next, reception level data L at this time. - Determine the initial speed of the data transmission rate of the modem 45 based on L3. That is, as shown in Fig. 5, the reception level is 26d.
B 9600bps when it is more than μ, 20dB when less than 26dBμ 7200bps, 20dB when it is more than μ
When it is less than 16 dBμ, the speed is set to 4800 bps, and when it is less than 16 dBμ, the speed is set to 2400 bps (processing 1.
06),.

Next, the destination facsimile machine executes modem 1 to training at the data transmission speed set above (processing 1).
07). If the modem 1 to training fails (N in process 108), the data transmission speed is set to the lowest speed,
In other words, if it is not 2400bps (N in process 109),
Processing to shift down the data transmission speed by one step 110)
, execute modem training again (process 107
fart).

Then, if modem training is successful (process 108
Y), the document image is read by a predetermined transmission process and the image information is transmitted (processing) IJ).

On the other hand, if modem 1 to lenning fails at the lowest data transmission speed (Y in process 109), the transmission process is stopped.

Next, when receiving a document image, the operator selects the star 1 on the operation display section 47 after making a call using the handsera l□2.
~Press the button. At this time, as described above, the facsimile machine 4 operates only in the off-hook state and switches the switch circuit 32.

In this case, a predetermined reception operation is performed without determining the reception level.

As described above, in this embodiment, in the interface device 3, the transmission signal TD and the reception signal R1) on the wireless device 1 side
The connection of each line is switched between handsets 1 and 2 for telephone calls and to facsimile machine 4 for facsimile communications. In addition, the upstream and downstream serial signals SU and SD are always transmitted between the wireless device 1 and the pans 1 to 12, and among the information transferred by the signals, necessary hook switch information and reception Only the level information is extracted and output to the facsimile machine n4.

Therefore, the facsimile mail (ii
Even if an operation is performed for each serial signal SU, S
The information transferred by D will not be interrupted on the way. This makes it possible to prevent malfunctions of the car telephone device.

In the above embodiment, hook switch information and reception level information are extracted from each upstream and downstream serial signal, but it goes without saying that other information can be extracted as necessary. Further, although the interface device 3 and facsimile device 4 are directly connected by signal line, if they are separated in terms of direct current using a photocoupler or the like, the influence of noise can be reduced. Also, since the interface device 3 receives power supply from the wireless device 1, it consumes power even when the facsimile device is not used. By doing so, power consumption can be reduced.

Furthermore, it goes without saying that the present invention is applicable not only to facsimile machines but also to various data transmission apparatuses composed of computers, terminal equipment, and modems.

[Effects of the Invention] As described in Section 2 below, according to the present invention, transmission paths for up and down serial signals are always formed between a wireless device and a handset regardless of the state of telephone calls or data transmission, and During data transmission, some of the information transferred by each serial signal is transferred to the data transmission device, so it is possible to switch from a call state to data transmission at any timing. Even if the information is transferred by the serial signal, the information transferred by the serial signal will not be interrupted midway, so malfunctions of the mobile telephone device can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram of a facsimile communication system according to an embodiment of the present invention, FIG. 2(a) is an explanatory diagram of a serial signal, FIG. Figure (d) is an explanatory diagram of hook switch information, the third
The figure is an explanatory diagram showing the flow of each upstream and downstream serial signal, Figure 4 is a flowchart showing the transmission operation of a facsimile machine, Figure 5 is an explanatory diagram of the data transmission rate set for the reception level, and Figure 6 is an explanatory diagram showing the flow of each serial signal. FIG. 1 is a schematic configuration diagram of a conventional interface device. DESCRIPTION OF SYMBOLS 1... Wireless device, 2... Handset, 3... Interface device, 4... Facsimile device, 32... Switch circuit, 33-CPU, 34.35.', y U
7 Le I/0141 Scanner, 42・Plotter, 43...encoding/decoding unit, 44...image memory, 4
5. Modem, 46. Communication control section, 47. Operation display section, 48. System control section. (b) (C) (d) Figure 3

Claims (1)

[Claims] It is installed between the wireless device of the car telephone device and the handset, and during a call, it forms a signal transmission path between the two, while during data transmission, it forms a signal transmission path between the two and the data transmission device. In a car phone interface device of a data transmission device that forms a signal transmission path between the two, during a call, a transmission path for transmitting signals and receiving signals is formed between the two, while during data transmission, Signal line switching means for forming a transmission path for the transmitted signal and received signal between the wireless device and the data transmission device, and each serial signal that is constantly transmitted between the two, regardless of whether it is a phone call or data transmission. A serial signal transmission means forming a transmission path, and extracting some information necessary for the operation of the data transmission device from among the information transferred by each of the serial signals during data transmission, and transmitting the data. 1. An interface device for a car phone of a data transmission device, characterized in that it is equipped with information extraction means for transferring information to the device.