Rockwell Automation 1770 DH,DHII,DH485 CABLE - Manual (Page 124)

Constructing RS-232-C and
Longline Cables
Appendix A
A-12
Figure A.16
A longline connection between 1773ĆKA and 1775ĆKA modules.
2
7
3
25
4
5
6
8
20
1
3
25
2
4
5
1
6
8
20
7
RS-232-C
CHANNEL
connector of
1773-KA or
1775-KA
Module
RS-232-C
CHANNEL
connector of
1773-KA or
1775-KA
Module
Connect the shield
at one end only
12542
Important: For cables longer than 50 feet, conductors 2 and 7, and 3 and 25
must be twisted pairs.
Important: For a 1775-KA module, turn off (open) switch 3 on the module.