ProSoft Technology MVI69-GSC - Manual (Page 82)

Reference MVI69-GSC ♦ CompactLogix or MicroLogix Platform
User Manual Generic ASCII Serial Communication Module
Page 82 of 102 ProSoft Technology, Inc.
September 24, 2010
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.
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).