Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 47)

Choosing Module Features
Chapter 3
3Ć5
The functions of the cable conductors (Figure 2.1 thru Figure 2.7) are
referenced to your ASCII device, not to your ASCII module.
Figure 2.1
RSĆ232ĆC Connections (50 ft. max): Data Terminal to Data Set
(Refer to specifications in Appendix D)
2
7
3
2
7
3
Received Data (BB)
Signal Ground (AB)
Transmitted Data (BA)
Receive
Transmit Receive
Transmit
Drain Wire (Shield)
To I/O
Chassis
Ground 2
ASCII Module
Data Set (DCE)
Device
Data Terminal
4
5
6
4
5
6
8
20
8
20
Request to Send (CA)
Clear to Send (CB)
Data Set Ready (CC)
Received Line Signal Detector
Data Terminal Ready
1
Belden
8723
or
Equiv.
Belden
8778
or
Equiv.
Control
Lines
1 Tied to +12Vdc
2 Solder an external ground wire (14 ga.) to the drain wire at the cable connector.
Connect it to the I/O chassis ground lug. Ground the shield at this end only.
11822
Equipment (DTE)
NOTE: (AB) thru (CD) refer to RSĆ232ĆC circuit labels.