User Manual

Command Reference Port Commands
12-85
Parameters Enabled/Disabled
Enables or Disables RS-485 mode. By default, the SCS is configured for RS-
232 networking.
Mode
When RS-485 Mode is enabled, you must choose either two-wire or four-wire
mode. If you do not explicitly set a mode with this command, the SCS will
default to four-wire mode.
2Wire
Sets the SCS to use two-wire mode.
4Wire
Sets the SCS to use four-wire mode.
Termination
Enable termination whenever you are using long cable runs and Disable it at
other times. Only end nodes should be terminated.
TXDrive
Controls how the SCS drives the TX pin.
Always
Sets the SCS to drive TX. The SCS will never tristate TX, even if data is not
being sent. Always is only valid for four-wire mode.
Auto
Sets the SCS to drive TX only when transmitting, and tristate when not
transmitting.
Defaults Disabled
Mode = 4Wire
Termination disabled
TXDrive = Always
See Also Show RS485, page 12-90; RS-485 Configuration, page 8-15