ProSoft Technology MVI69-101S - Manual (Page 122)

MVI69-101S ♦ CompactLogix or MicroLogix Platform Reference
IEC 60870-5-101 Slave Communication Module
Page 122 of 149 ProSoft Technology, Inc.
March 16, 2009
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).