JPH0588802A - V.24/v.28-v.35 shared interface circuit - Google Patents

Abstract

PURPOSE:To obtain an interface circuit which can arbitrarily constitute a.24/V.28 driver receiver circuit and a V.35 driver receiver circuit at one printed wiring board. CONSTITUTION:To a clock output terminal 1, a data output terminal 2 and a data input terminal 5, respective clock output drivers 16 and 17 for V.35 and V.24/V.28, data output drivers 18 and 19, data input receivers 22 and 23 are respectively connected in parallel. Respective drivers and receivers are connected to clock output terminals 6 and 11, data output terminals 7 and 12 and data input terminals 10 and 15 provided at a V.35 port, and a V.24/V.28 port respectively. On the other hand, to a control output terminal 3 and a control input terminal 4, a driver 20 for control and a receiver 21 for control shared for the V.35 and for the V.24/V.28 are connected and these are respectively connected to control output terminals 8 and 13 and control input terminals 9 and 14 of respective ports.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a V.24 / V.28 driver.
The present invention relates to an interface circuit capable of forming a receiver circuit and a V.35 driver / receiver circuit on the same printed circuit board.

[0002]

2. Description of the Related Art Conventionally, a V.24 / V.28 driver / receiver circuit has a clock output terminal 1, a data output terminal 2, a control output terminal 3, a control input terminal 4, and a data input terminal 5 as shown in FIG. A dedicated clock output driver 17, data output driver 19, control driver 20, control receiver 21, and data input receiver 23 are connected to each of the above, and each is connected to each terminal 11 to 15 of the V.24 / V.28 port. Connected. Similarly, the V.35 driver / receiver circuit is shown in Fig.4.
Connect the output driver 16, the data output driver 18, the control driver 20, the control receiver 21, and the data input receiver 22 to the terminals 1 to 5, respectively, and connect them to the terminals 6 to 10 of the V.35 port. Is going. The connectors of the V.24 / V.28 driver / receiver circuit and the V.35 driver / receiver circuit have different standards as shown in FIGS.

[0003]

As described above, the conventional V.2 is used.
4 / V.28 driver / receiver circuit and V.35 driver /
It is difficult to configure the receiver circuits on the same printed circuit board because the connector standards are different. Therefore, in order to configure these circuits, it is necessary to design and manufacture two printed circuit boards respectively. Further, since both circuits are formed on different printed circuit boards, it is not possible to use them in common even though the control driver 20 and the control receiver 21 that are common to both circuits are present. It becomes a disadvantage in simplification. An object of the present invention is to provide an interface circuit capable of arbitrarily configuring a V.24 / V.28 driver / receiver circuit and a V.35 driver / receiver circuit on one printed circuit board.

[0004]

The interface circuit of the present invention has a clock output terminal, a data output terminal, and a data input terminal for V.35 and V.24 / V.28 clock output drivers and data, respectively. Connect the output driver and data input receiver in parallel, and connect each driver and receiver to the clock output terminal, data output terminal, and data input terminal provided on the V.35 port and V.24 / V.28 port, respectively. On the other hand, the control output terminal and the control input terminal are connected to the control driver and the control receiver which are also used for V.35 and V.24 / V.28, and these are connected to the control output terminal and control input of each port. Connect to each terminal. In addition, the dual-purpose interface circuit is mounted on one printed circuit board, and a mounting hole for selectively mounting the V.35 connector and the V.24 / V.28 connector is formed on this printed circuit board. ..

[0005]

According to the present invention, V.35 can be provided on one printed circuit board.
Circuit and V.24 / V.28 circuit are configured, and the circuit common to both is shared, and by selecting and mounting either connector, design and manufacturing can be facilitated. ..

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention. A clock output driver 16 for V.35 and a clock output driver 17 for V.24 / V.28 are connected in parallel to the clock output terminal 1, and they are respectively connected to the clock output terminal 6 of the V.35 port and V.24 / V. It is connected to the clock output terminal 11 of the .28 port. Further, to the data output terminal 2, a V.35 data output driver 18 and a V.24 / V.28 data output driver 19 are connected in parallel, and each is connected to the data output terminals 7 and 12 of each port. ing. Further, a V.35 data input receiver 22 and a V.24 / V.28 data input receiver 23 are connected in parallel to the data input terminal 5, and each is connected to the data input terminals 10 and 15 of each port. There is.

On the other hand, the control output terminal 3 is provided with one control driver 20 for both V.35 and V.24 / V.28. 13 are connected to each. Similarly, the control input terminal 4 is provided with one control receiver 21 for both, and is connected to the control input terminals 9 and 14 of the respective ports. The printed circuit board on which this circuit is mounted complies with the standard shown in FIG. 2, and both V.35 and V.24 / V.28 connectors can be attached.

According to this configuration, the control driver 20 and the control receiver 21 which are not restricted by the data communication speed are used for both V.35 and V.24 / V.28, and the data communication speed is restricted. Receive clock and data drivers 16-19
By distinguishing V.35 and V.24 / V.28 from V.35 and V.24 / V.28 for receivers, if both circuits are configured on a single printed circuit board, the control driver 20 and the control receiver 21 are respectively It is possible to omit each one. And if either V.35 or V.24 / V.28 connector is mounted and each terminal is connected, one printed circuit board can be used for V.35 or V.24 / V. It can be arbitrarily set for .28.

[0009]

As described above, according to the present invention, both the V.35 and V.24 / V.28 V.35 and V.24 / V.28 control drivers and receivers which are not restricted by the data communication speed are used, and the data communication speed is restricted. By distinguishing the clock and data receiving driver and receiver from each other, V.35 can be printed on one printed circuit board.
Driver / receiver circuit for V.24 / V.28 and driver / receiver circuit for V.24 / V.28 can be configured. Only one type of printed circuit board design and manufacturing is required, and the control driver and receiver can be omitted. effective.

[Brief description of drawings]

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

FIG. 2 is a mounting hole dimension diagram of a printed circuit board according to an embodiment of the present invention.

FIG. 3 is a block diagram of a conventional V.24 / V.28 circuit.

FIG. 4 is a block diagram of a conventional V.35 circuit.

FIG. 5 is a mounting hole dimension diagram of a conventional V.24 / V.28 printed circuit board.

FIG. 6 is a mounting hole dimension diagram of a conventional V.35 printed circuit board.

[Explanation of symbols]

 1 Clock output terminal 2 Data output terminal 3 Control output terminal 4 Control input terminal 5 Data input terminal

Claims (2)

[Claims] 1. A clock output terminal, a data output terminal, and a data input terminal are connected in parallel with a clock output driver, a data output driver, and a data input receiver for V.35 and V.24 / V.28, respectively. Also, connect each driver and receiver to the clock output terminal, data output terminal, and data input terminal provided on the V.35 port and V.24 / V.28 port, respectively, while connecting the control output terminal and control input terminal to A V.35 and V.24 / V.28 dual-purpose control driver and control receiver are connected, and these are connected to the control output terminal and control input terminal of each port, respectively. .24 / V.28 ・ V.35 dual-purpose interface circuit. 2. The dual-purpose interface circuit is mounted on one printed circuit board, and this printed circuit board is V.35.
And V.24 / V.28 / V.3 according to claim 1, wherein mounting holes for selectively mounting connectors for V.24 / V.28 and V.24 / V.28 are provided.
5 Dual-purpose interface circuit.