ProSoft Technology PC56-OPC - Manual (Page 23)

Reference PC56 ♦ ControlLogix Platform
User Manual In-Rack Industrial PC
ProSoft Technology, Inc.
Page 23 of 34
November 18, 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).