Omega RD200 - Manual (Page 24)

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4. CONNECTIONS 4.7 Communications terminals
3 RS-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
*For the details of the wiring, refer to 2 RS-232C connections.
2) RS-485
*For the details of the wiring, refer to 2 RS-232C connections”.
Personal computer
(9-pin or 25-pin connector) *
RD
SD
ER
SG
DR
RS
CS
2
3
4
5
6
7
8
SDA
SDB
RDA
RDB
SG
RD
SD
SG
RDA
RDB
SDA
SDB
1
2
3
4
5
6
7
8
SDA
SDB
RDA
RDB
SG
SDA
SDB
RDA
RDB
SG
Line converter
(SC8-10)
Within 15 m Within a total length of 1.2 km (max. 31 recorders)
Termination
resistance
100
Ω, 1/4W
Example of 9-in
connector
Personal computer
(9-pin or 25-pin connector) *
SA
SB
SG
RD
SD
SG
RDA
RDB
SDA
SDB
1
2
3
4
5
6
7
8
SA
SB
SG
SA
SB
SG
Line converter
(SC8-10)
Within 15 m Within a total length of 1.2 km (max. 31 recorders)
Termination
resistance
100
Ω, 1/4W
Example of 9-in
connector
RD
SD
ER
SG
DR
RS
CS
2
3
4
5
6
7
8
(1) (2) (3)
RD200/RD2800 hybrid recorders
(1) (2) (3)
RD200/RD2800 hybrid recorders