JPH0448017B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a combination telephone having a built-in modem and a network control device, a so-called modem phone, and a DTE
(Data Terminal Equipment) via an RS-232C port to perform data communication.

(Prior art) Conventionally, this type of device and, for example, “NP100-
"D/P Telephone Netphone User's Manual", Nippo Tsushin Kogyo Co., Ltd. (July 1, 1980)
There was something disclosed in the Japanese revised edition). The conventional device has three modes for outgoing calls: manual calling, automatic calling 0, and automatic calling 1, and three modes for receiving calls: manual calling, automatic calling 0, and automatic calling 1.

A "manual call" is a call that can be made manually in the same way as using a regular telephone, allowing both communication and phone calls. Switching from call to communication is done by button operation.

"Automatic call 0" is a call that is automatically dialed based on the dialing information sent from the DTE to the telephone, and is a call that allows both communication and phone calls. Switching from call to communication is done by button operation.

"Automatic call 1" is a call that is automatically dialed based on the dialing information sent from the DTE to the telephone, and is a call exclusively for communication. The compound telephone is automatically set for communication only in response to a response from the other party.

“Manual dialing” is the same as normal telephone operation.
This is an incoming call in which you respond by raising your handset. Switching from call to communication is done by button operation.

“Automatic call 0” means that when the compound telephone receives a call to DTE, the CI in the RS-232C interface is
This is an incoming call that is indicated using a (Call Indicator) signal, and is an incoming call exclusively for communication. Upon receiving the incoming call indication, the DTE turns on the ER (Equipment Ready) signal in the RS-232C interface and sends it to the telephone, setting it exclusively for communication.

"Automatic call 1" is an incoming call in which the multifunction telephone repeats an incoming call display alternately with a CI signal and data at the time of incoming call to DTE, and is used exclusively for communication. The phone is configured for communication only when it receives switch connection data from the DTE.

(Problems to be Solved by the Invention) As described above, when automatic call reception is set, in order for the DTE to recognize that a call has been received, a CI signal is required from the telephone to the DTE. However, the DTE RS-232C interface does not necessarily support CI signals.
For this reason, there are many DTEs that do not detect CI signals, and in this case, another signal equivalent to the CI signal is required. However, in the case of a device having the above configuration, there was a problem in that the DTE could not receive an incoming call display only with data. In addition, it is not possible to switch to a call after communication has ended, and the code unit for commands/responses exchanged between the telephone and DTE is fixed (7 bits of data + 1 bit of even parity), allowing for flexible code settings. There was a problem that it was not possible.

The present invention eliminates the above problems, allows incoming calls to be indicated using only data signals for DTEs that cannot detect CI signals, and furthermore allows the DTE communication format to be used as data signals as is. The purpose is to provide a highly scalable data signaling system.

(Means for Solving the Problems) As shown in FIG. 1, the compound telephone to which this invention is applied includes a CI detection possibility selection and setting means 11 for selecting a data signal system, and a CI detection possibility selection and setting means 11 that selects a data signal system. After the signaling method is set,
A means 12 for transmitting and receiving commands/responses between the DTE and the multifunction telephone 21 to establish a communication link between the DTE and the other party's DTE, and a means 13 for switching the route from communication to speech at the end of communication. have Furthermore, command/response code units can be set arbitrarily.

(Function) The CI detection enable/disable selection setting means is from the compound telephone.
This is a means for selecting whether to display an incoming call to the DTE using a CI signal or a command/response. After establishing a communication path with the other party, the communication link establishing means 12 sends and receives commands/responses to and from the other party's DTE, thereby establishing a communication link with the other party's DTE. The route switching means is for switching from call to communication.
Also, the reverse route switching is performed. By allowing command/response code units to be set arbitrarily, control between the multiplex telephone and DTE, and
Data communication between the DTE and the other DTE can be achieved with only one RS-232C connection, simplifying the circuit and improving efficiency.

(Example) Figure 2 shows a telephone (modem phone) 21 and a DTE 2
2 is a conceptual diagram illustrating a state where the two are connected through an RS-232C interface. The telephone 21 is
It has a DTE mode switch as a CI detection enable/disable selection setting means. For example, by setting this mode switch to "M", the control signal method is selected.
Set. Subsequent communication function control is based on the conventional modem and interface, and the telephone 21 and DTE
Communication control between 22 is performed using RS-232C control signals. On the other hand, by setting the DTE mode switch to, for example, "A", the data signal system is selected and set. Subsequent communication function control is performed using command/response strings.

FIG. 2 shows the case where the control signal method is selected. If the DTE 22 is capable of detecting the CI signal of the RS-232C interface, it is set to this control signal system. On the other hand, FIG. 2 shows the case where the data signal system is selected. If the DTE 22 cannot detect a CI signal, it will be set to data signaling and the phone 21
control by sending commands from. This command is the SD (Send Data) of the RS-232C cable.
Transfer is performed using the RD (Received Data) pin and the RD (Received Data) pin.

FIG. 3 is a functional block diagram showing essential parts of the telephone set 21 shown in FIG. 2. As shown in FIG. In the figure, 31 is
This is an RS-232C interface section and is connected to the DTE 22 via a cable. 32 is DTE22
This is a modem section that performs modulation and demodulation when communicating between the terminal and the other party's DTE (not shown). The modem section 32 is not directly related to the understanding of the present invention, so a detailed explanation will be omitted, but many known modulation/demodulation methods can be adopted. 33 is a CPU that controls the entire telephone 21. The setting state of the CI detection enable/disable selection setting means is taken into this CPU 33.
Reference numeral 34 denotes a telephone unit, which is comprised of a known telephone circuit for communicating with a partner (not shown).
Reference numeral 35 denotes a route switching section, which switches routes within the telephone 21 during communication/calls. This route switching section 3
5 is composed of a switch 35a and a switch 35b.

When the data signaling system is set by the CI detection enable/disable selection setting means, the route switching section 35 is controlled by turning on/off the ER signal sent from the DTE 22 to the telephone 21 during the RS-232C interface.

That is, in the initial state, the switch 35a is RS-
The 232C interface section 31 and the CPU 33 are connected, and the switch 35b connects the line and the telephone section 34. When the DTE 22 turns on the ER signal in this state, the switch 35a connects the RS-232C interface section 31 and the modem section 32, and the switch 35b connects the line and the modem section 32. As a result, DTE22 and the other party (not shown)
Communication with DTE becomes possible. Also, DTE
22 turns off the ER signal, the switching unit 35 is controlled and returns to the initial state. In summary, the ER signal
When it is ON, it becomes a modem mode that allows DTE-DTE communication, and when the ER signal is OFF, it becomes a command/response mode that allows commands/responses to be exchanged between the DTE and the telephone.

FIG. 4 shows an example of commands/responses exchanged between the telephone 21 and the DTE 22 when the data signaling method is selected. If the DTE 22 does not detect a CI signal, the telephone sends a command to the DTE as an alternative to the CI signal to notify the DTE of an incoming call.

In other words, if the call is received manually, the call is received by pressing the button, or if the call is received automatically, the call is automatically received from the telephone 21.
Sends a DTE switching instruction command (E command) to the DTE 22. This command is sent from the CPU 33 to the RD line and then to the RS-232C interface section 3.
1 to the DTE. The DTE 22 is activated by receiving this E command, and returns a DTE switchable response (A response) to the telephone set. The telephone receives this A response and sets up a path with the other party. At this point, switch 3
5a is the RS-232C interface section 31 and CPU 3
3 is connected.

Next, an ER signal is sent from the DTE to telephone 21.
When turned on, the route switching unit 35 is controlled to enter the modem mode, and the route of DTE 22 → RS-232C interface unit 31 → modem unit 32 → line is set, and communication between the DTEs becomes possible.

When communication between DTEs ends, DTE2
2 turns off the ER signal. Telephone 21 is this ER
Upon receiving the signal OFF, the route switching unit 35 is controlled;
Enter command/response mode.

Thereafter, by sending the A command from the DTE 22 to the telephone 21, mutual communication becomes possible.

As shown in FIG. 4, commands/responses exchanged between the DTE 22 and the telephone 21 have a structure of □C+identifier+CR for the command and □R+identifier+CR for the response. Generally, when performing DTE-DTE communication, there are many code bodies. In instant modem mode, the DTE sends various codes to the other party.
Send and receive data to and from DTE. Here, if the commands/responses exchanged between the DTE 22 and the telephone 21 can also be set arbitrarily according to the communication code of DTE communication, the DTE can use the same code in command/response mode and modem mode. It's convenient to use.

For this reason, the telephone 21 has a function that allows the code unit of the command/response mode to be set in accordance with the code unit used by the DTE 22.

This setting in units of codes is performed, for example, by pressing a function key, numeric key, etc. on the telephone 21. As a result, the command/response code units can be set to 7 units or 8 units, and the parity can be arbitrarily set to even parity, odd parity, or non-parity.

(Effects of the Invention) As described above, this invention enables the ER signal to be turned on/off.
OFF controls route switching within the multifunction telephone. For this reason, RS−
232C interface not fully supported
When connecting to a DTE, such as a handheld computer, it can be controlled using only commands/responses. Furthermore, after the communication ends, you are free to switch to a phone call. If necessary, you can also switch to modem mode for further communication. It also has the advantage that command/response code units can be set arbitrarily. Furthermore, it is needless to say that the present invention does not necessarily require that the composite telephone and DTE be separate, and may be implemented in a device in which they are integrated.

[Brief explanation of the drawing]

FIG. 1 shows the configuration of this invention, and FIG. 2 shows the structure of this invention.
FIG. 3 is a conceptual diagram of connecting a telephone and DTE using an RS-232C interface, FIG. 3 is a functional block diagram of the compound telephone, and FIG. 4 is a diagram showing an example of command/response used in the present invention.

Claims (1)

[Claims] 1. In a data signaling system that connects a terminal that performs data transmission and a telephone with a built-in modem circuit using an RS-232C interface, the telephone transmits an incoming call notification from the telephone to the terminal. CI detects whether it is possible to perform the following using the CI signal of the RS-232C interface.
a detection enable/disable selection setting means; and a switching means for switching between a modem mode in which the terminal performs data communication with a communication partner and a command/response mode in which commands and responses are exchanged locally between the terminal and the telephone. and the telephone sets the switching means to a modem mode when the terminal can detect a CI signal, and sends an incoming call notification from the telephone to the terminal.
When the terminal cannot detect the CI signal, the switching means is set to command/response mode, and the incoming call notification from the telephone to the terminal is transmitted between the telephone and the terminal. The terminal performs data communication with the communication partner by exchanging commands/responses with the telephone, and the terminal further performs data communication with the communication partner by turning on an ER signal of the RS-232C interface to the telephone. Data signaling system. 2. The data signal system according to claim 1, wherein the code unit of the command or response can be arbitrarily set according to the code unit in which the terminal performs data communication.