Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 277)

Cable Connections
Appendix C
C-4
Cable Length Requirements
Refer to Table C.C for information on the cable lengths that you can use
with the serial COMM1, COMM2, and COMM3 ports.
Table C.C
COMM1, COMM2, and COMM3 Maximum Cable Length
RS Communication Transmission Rate Maximum Cable Length
232C all 15 m (50 ft)
422 (compatible) 19.2 kbps 61 m (200 ft)
423 9600 61 m (200 ft)
485 all 1.2 Km (4000 ft)
Cable Configurations
See Figure C.3 for an example cable configuration.
Figure C.3
Cable for a 9ĆPin IBM PC/AT, T50, T60, or T47 Computer
to the Control Coprocessor 25ĆPin COMM1, 2, or 3 Port
5
7
8
6
1
4
25
14
13
1
1
5 6
9
3
2
7
5
4
20
8
6
3
2
9
Common
RXD
TXD
CTS
RTS
DTR
CD
DSR Common
TXD
RXD
RTS
CTS
DSR
CD
DTR
N/C
Shell shield
Shell shield
x.x m
(x.xx ft.) 1
1
See Table C.C for maximum cable lengths for the COMM1, COMM2, and COMM3 ports.
19493
9Ćsocket
female connector to
personal computer
25Ćpin
male connector to
control coprocessor