ProSoft Technology inRAx MVI56-CAS User Manual page 60

MVI56-CAS ♦ ControlLogix Platform
Teledyne CA Slave Module
RS-232: Modem Connection
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.
RS-232: Null Modem Connection (Hardware Handshaking)
This type of connection is used when the device connected to the module
requires hardware handshaking (control and monitoring of modem signal lines).
Page 60 of 86
Reference
ProSoft Technology, Inc.
December 26, 2007