Omega RD2800 Series User Manual page 24

4. CONNECTIONS
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
1) RS-422A
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
*For the details of the wiring, refer to
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
*For the details of the wiring, refer to
4.7 Communications terminals
2 RS-232C connections.
Line converter
*
(SC8-10)
RD
1
SD
2
SG
3
4
RDA
5
RDB
6
SDA
7
SDB 8
Within 15 m
Within a total length of 1.2 km (max. 31 recorders)
2 RS-232C connections.
Line converter
*
(SC8-10)
RD
1
2 SD
SG
3
4
RDA
5
RDB
6
SDA
7
SDB
8
Within a total length of 1.2 km (max. 31 recorders)
Within 15 m
2 RS-232C connections".
－２０－
RD200/RD2800 hybrid recorders
(1) (2)
SDA
SDA
SDB SDB
RDA
RDA
RDB
RDB
SG SG
RD200/RD2800 hybrid recorders
(1) (2)
SA SA
SB
SB
SG
SG
(3)
SDA
SDB
RDA
RDB
Termination
resistance
SG
100 Ω, 1/4W
(3)
SA
SB
Termination
resistance
100 Ω, 1/4W
SG