Hardware manual

3 Omron

2-95

Chap.2

Connection Diagram 3-2: RS-422 Link unit to MICRO/I

PLC(RS-485/422) HG1F/2F/2S/3F/4F(RS-485/422)

Pin No.

Name

HG1F

Connector

HG1F

Terminal

HG2F/

3F/4F

HG2S

7 FG FG Cover - 1 1

9 SDA(SD-) TERM - - 9 -

5 SDB(SD+) RDA(RD+) 2 3 10 32

6 RDA(RD-) RDB(RD-) 7 4 16 33

1 RDB(RD+) SDA(SD+) 1 1 11 30

3 SG SDB(SD-) 6 2 15 31

2 CS- 9 - 18 37

4 RS- 8 - 19 35

8 CS+ 4 - 21 36

RS+ 3 - 22 34

SG 5 5 7 29

Internal

termination

resistor

330-Ohm

D-sub, 9P connector socket type (HG1F)

D-sub, 25P connector socket type (HG2F/3F/4F)

D-sub, 37P connector plug type (HG2S)

D-sub, 9P connector socket type

Shield Wire

- We recommend that you switch on the termination resistor on the PLC Link Unit side for

long-distance transmission.

- There is no pin No. corresponding to TERM on the HG1F/HG2S. When inserting a

termination resistor, use a communication switch. For the setting of the switch, refer to "3

Important Points Regarding Wiring" in Chapter 1.

When you use the Terminal Block type of HG1F, make sure to configure the Hardware Flow

control to NONE because the HG1F doesn’t have control lines.