Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 51)

Choosing Module Features
Chapter 3
3Ć9
Use a 25-pin male D-shell connector such as Amp DB-25P for your cable
connections to the ASCII module. Terminate the shield to pin 1 at the
module end only.
Figure 2.6
AĆB Long Line Connections (5000 ft max)
2
25
3
2
7
11
Receive
Receive
Transmit
Drain Wire (Shield)
To I/O
Chassis
Ground 1
ASCII Module Industrial Terminal
Channel B
18 25
Transmitted Data
Return
Received Data
Return
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.
11826
Belden
8723 or
Equiv.
Figure 2.7
RSĆ232ĆC Simplex Write Connections
(Refer to Specifications in Appendix D)
7 7
Receive Transmit
Drain Wire (Shield)
To I/O
Chassis
Ground [1]
ASCII Module Device
(DTE)
3 3
Signal Ground (AB)
Received Data (BB)
11827
NOTE: Jumper pin 2 to pin 18 at the module end of the cable (special case).
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.
(DCE)
2
18
Belden
8723
or
Equiv.
[1]