Omega RS-422A, RS-485 Connections, Example of 9-in connector, RD200/RD2800 hybrid recorders

4.CONNECTIONS

4.7 Communications terminals

3RS-422A, RS-485 Connections

RS-422/485 communications interface is connected to a personal computer via a line converter (our Model SC8-10: sold separately). Three signals of SD, RD and SG are used between the line converter and the personal computer but any control signal is not used. Wiring processing for control signal in a connector is

necessary in the same as	2	RS-232C connections.
1) RS-422A
Personal computer		Line converter
(9-pin or 25-pin connector)*		(SC8-10)

RD 2

SD 3

ER 4

SG 5

DR 6

RS 7

CS 8

Example of 9-in connector

1 RD

2 SD

3 SG

4

RDA 5

RDB 6

SDA 7

SDB 8

RD200/RD2800 hybrid recorders
(1)	(2)	(3)
SDA	SDA	SDA
SDB	SDB	SDB
RDA	RDA	RDA
RDB	RDB	RDB	Termination
SG	SG	SG	resistance
			100 Ω, 1/4W

Within 15 m Within a total length of 1.2 km (max. 31 recorders)

*For the details of the wiring, refer to 2 RS-232C connections.

2) RS-485

Personal computer

(9-pin or 25-pin connector)*

RD 2

SD 3

ER 4

SG 5

DR 6

RS 7

CS 8

Example of 9-in connector

Line converter

(SC8-10)

1 RD

2 SD

3 SG

4

RDA 5

RDB 6

SDA 7

SDB 8

RD200/RD2800 hybrid recorders

(1)	(2)	(3)
SA	SA	SA
SB	SB	SB
SG	SG	SG

Termination

resistance

100 Ω, 1/4W

Within 15 m Within a total length of 1.2 km (max. 31 recorders)

*For the details of the wiring, refer to 2 RS-232C connections”.

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