Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 18)

Installation
Chapter 2
2Ć6
Data Highway Cable Connections
There are two cable connectors, or ports, on the front of the 1775–KA
module (Figure 2.1). The bottom port, labeled DATA HWY., is for
connection to the Allen–Bradley Data Highway. If you are using the
1775–KA module in a Data Highway application, plug the Data Highway
dropline cable into this port. For details on the installation of the Data
Highway cable, refer to the Data Highway Cable Assembly and
Installation Manual (publication 1770–810).
RS-232-C Cable Connections
The RS–232–C port, labeled MODEM INTERFACE on the 1775–KA
module, can interface with any RS–232–C device that is capable of
understanding and generating the communication protocol described in
this chapter. Some typical RS–232–C applications are:
Interfacing two PLC–3 controllers through a modem link (Figure 2.3)
Figure 2.3
Linking Two PLC-3 Controllers
Modem
1775-KA Module
10004–I
PLC-3 Controller
Modem
1775-KA Module
PLC-3 Controller
NOTE: Modems required only
for distances greater
than 50 feet.