JPS6121658A - Connection system of terminal equipment - Google Patents

Abstract

PURPOSE:To reduce the system cost required for the test of a terminal equipment by connecting an interface line of the terminal equipment to a terminal controller via an adaptor and allowing the terminal controller and the terminal equipment to transmit and receive data not via a MODEM based on a timing signal of a reflecting means generating a transmission enable signal and a timing supply means. CONSTITUTION:Each terminal equipment I/O4 is connected to a terminal controller TC1 via a MODEM adaptor 5. On the other hand, the MODEM adaptor 5 is provided with a couple of level converters 51, 52. Further, the MODEM adaptor 5 is provided with a timing signal generator 53 and a signal the same as a timing signal ST1 is supplied to the I/O4 as a timing signal ST2 to the TC1. Further, the I/O4 is provided with a line control section 44, processor 45, memory control circuit 46 and a unit control section 47 controlling various input/ output devices, and they are controlled by a command from the TC1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a terminal device connection method that allows a terminal device having a modem interface to be connected to a terminal control device without using a modem.

For example, in a terminal device that is connected online to a center computer, etc., a configuration is adopted in which the terminal device is first connected to the center computer via a terminal control device. Further, as the number of terminal devices connected online increases, the terminal control device is configured to be connected to the terminal control device by communication communication via a modem. As a result, even if the distance between the terminal control device and the terminal device group becomes long, it can be handled.

[Conventional technology]

On the other hand, the terminal control device is equipped with a function (test mode) for testing the operation of the terminal device. Therefore, as one of the operation tests performed at the time of shipping the terminal device, it is possible to perform an overall operation test including a test of the data transmission/reception function with the terminal control device.

Conventionally, however, a method has been adopted in which the terminal control device and the terminal device are connected in the original connection form and the terminal device is tested. As shown in FIG. 4(a), a terminal control device (TC) 10 and a plurality of terminal devices (Ilo) 7
0 through modems 30 and 40 and communication lines 50. The DC branching device 60 selectively branches and switches the ink face line of each terminal device 70 and the interface line 80 of the modem 40.

[Problem that the invention seeks to solve]

In this way, in the past, it was necessary to take the trouble to prepare a modem 30, 40 and a line 50 to connect the terminal control device and the terminal device. For this reason, the system cost for testing the terminal device becomes high, and the device (occupied) area inevitably becomes large. Therefore, it is natural to consider connecting both devices without using these modems 30 and 40. However, as shown in FIG. 4(b) and (c+), both devices 10.70 have an interface for modem connection. That is, the interface line 20.80 of each device 10.70 has a transmission request R3. , transmission permission CS,
Send data SD.

Signal lines are required for transmitting and receiving signals such as the reception data RD, the carrier detection signal CD, and the transmission timing signals % ST1 and ST2. Therefore, it is not possible to simply connect these two interface lines 20.80.

[Means to resolve the problem]

The present invention aims to provide means for solving the above-mentioned problems. For this purpose, the terminal control device and the terminal device are connected by an adapter (modem adapter), and furthermore, a means for automatically returning a transmission permission C8 from a transmission request R3 from the terminal device, and a terminal control device are provided. and means for supplying system timing.

[Effect]

That is, in the modem interface, transmission data is sent in response to a transmission permission signal from the modem side. Therefore, by returning the transmission request R3 from the terminal device as it is, the transmission permission signal CS can be given.
There is no need to break the interface on the terminal device side. Also.

By providing means for supplying timing signals to the terminal control device in place of the modem, the transmission timing on the terminal control device side can be freely set. The present invention will be explained in detail below using Examples.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention.

That is, each terminal device (hereinafter referred to as I10) 4 is connected to a terminal control device (hereinafter referred to as TC) 1 via a modem adapter 5. Note that the DC branching device 3 has a plurality of l104
1 to 43 to the TC, and since it has no particular relation to the present invention, its details will be omitted.

However, this modem adapter 5 is used in cases such as connecting Ilo, which does not have a modem interface, to a modem, and in this embodiment is used as a signal converter and a level converter. That is, the transmission data line on the I10 side.

The received data line is converted into a received data line and a transmitted data line on the TC side, respectively. Furthermore, the interface line 2 on the TC side
(for example, 12V) and the signal level (for example, 5V) of the interface line 6 on the I10 side.

FIG. 2 is a diagram illustrating the operating principle of the embodiment shown in FIG. 1. That is, the modem adapter 5 converts the data signal level between the TC-110s. Further, a transmission permission signal (not shown) on the TC side is always kept valid (ON state). Therefore, TCl can transmit data at its own timing. Note that the TCI data transmission timing ST2 is configured to be supplied from a modem adapter.

FIG. 3 is a diagram showing the detailed configuration of each part in the embodiment of FIG. 1. In this figure, the same parts as in FIG. 1 are given the same reference numerals.

The interface lines 2 are connected by connectors 25, 26 to the TCI and modem adapter 5, respectively. Then, in the TCI, this interface signal is transmitted via the line control adapter 11 to the line control unit 12. It is introduced into the data transmission/reception control section 13. On the other hand, in the modem adapter 5, a pair of level converters 51. ．． 52 is provided. In other words, l
The signal levels of the data line and control line from 104 are T C,
A converter 52 is provided that converts the signal level of the data line and control line of LTC1 to the signal level of the interface line 6 of LTC1. The modem adapter 5 is also provided with a timing signal generator 53, which generates the same signal as the timing signal STI (not shown) for l104.
It is supplied as a timing signal ST2 to TCl. Further, a setting terminal 54 is provided for arbitrarily setting the speed (baud rate) of the timing signal generated by the timing signal generator 53.

On the other hand, the line control unit 44. Bromo, 7s45
．． Memory control circuit 46. Unit control sections 47 for controlling various input/output devices are provided, and the operations of these sections are controlled by commands from the TCl.

The data transfer operation in the system shown in FIG. 3 will be explained below.

■ First, from TCl's unillustrated processor, l104
An operation instruction (for example, printer test printing) command is sent from the line control adapter 11. This command data is sent to l104 after level conversion is performed by the modem adapter 5. The line control unit 1104 receives this command data using, for example, the HD LC procedure. As a result, the unit (in this case, the printer) designated by the received command data is driven by the unit control section 47.

(2) Upon receiving the above command data, the line control unit 44 of the l104 turns on the transmission request R3. This transmission request R3 is sent to the TC via the level converter of the modem adapter.
It is folded back within the interface connector 25 on the l side.

That is, in this embodiment, the transmission request line and the transmission permission line are short-circuited at the connector 25.

■ The looped signal is transmitted via the modem adapter 5.
It is supplied as a transmission permission signal C3 to the 104 side. Thereby, the line control unit 44 recognizes that data transmission is possible.

■ Next, the line control unit 44 sends the transmission data given by the processor 45 (for example, a response to data reception or a response signal due to command execution) to the interface line 6.
Send upward.

(2) Upon completion of data transmission, the line control unit 44 turns off the transmission request R3. As a result, transmission permission C8 to l104 is also turned off.

The operation and response of I104 to the TCI command are accomplished by performing each of the above steps. in this way,
The modem ink on the 1104 side allows data transfer between the TC and I 10 at any desired rate.

In other words, when using a modem, you can set any data transfer speed without being affected by the modem's baud rate.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to connect TC and Ilo without using a modem or communication line (cable), and it is possible to significantly reduce the system cost of an I10 test system, etc. becomes.

[Brief explanation of drawings]

Fig. 11ffi is a diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing the operating principle of the embodiment, Fig. 3 is a diagram showing the detailed configuration of the embodiment system, Fig. 4 +al to (C) are conventional T(,
-110 is a diagram showing a connection method between terminals. ■ is a terminal control device (TC), 5 is a modem adapter, 25
．． 26 is a connector, 53 is a timing signal generator, 54
indicate the setting terminals. 4,

Claims (1)

[Claims] In a system in which a terminal control device and a terminal device are connected, each having a modem interface, and the terminal device is tested for operation by the terminal control device, the interface line of the terminal device is connected to the terminal control device via an adapter, and the terminal device is A return means for returning a data transmission request sent by the device and issuing a transmission permission signal, and a supply means for supplying a timing signal for data transmission to the terminal control device, and based on the timing signal output by the supply means, A terminal device connection method characterized in that a terminal control device and the terminal device exchange data without using a modem.