ProSoft Technology MVI56E-LDM - Manual (Page 216)

Cable Connections ControlLogix Platform ♦ "C" Programmable
Developer's Manual Linux Application Development Module
Page 210 of 264 ProSoft Technology, Inc.
March 12, 2014
6.2 RS-232 Application Port(s)
When the RS-232 interface is selected, the use of hardware handshaking
(control and monitoring of modem signal lines) is user definable. If no hardware
handshaking will be used, here are the cable pinouts to connect to the port.
6.2.1 RS-232: Modem Connection (Hardware Handshaking Required)
This type of connection is required between the module and a modem or other
communication device.
The "Use CTS Line" parameter for the port configuration should be set to 'Y' for
most modem applications.