Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 49)

Choosing Module Features
Chapter 3
3Ć7
When configured for current loop and you use terminals 13 and 11 for
transmit, your ASCII module powers its own transmit loop (Figure 2.3
and Figure 2.4). Your module can accept an active receive current loop
powered by the ASCII device. In this case, module operation is passive
transmit and you use module terminals 11 and 18 (Figure 2.5).
Figure 2.3
Current Loop Connections (500 ft. Max): Device is Active Transmit, Passive Receive
(Refer to specifications in Appendix D)
12
24
Transmitted Data
(+)
Drain Wire (Shield)
To I/O
Chassis
Ground 1
ASCII Module Device
Belden
8723
or
Equiv.
1 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.
11823
Transmit with
Current Source
Return
Passive
Receive
(-)
13
11
Received Data
(+)
Return
Transmit with
Current Source
(-)
Passive Receive