GE Grid Solutions
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Communications Ports, Continued
Radio Keying
Operation
If enabled by configuring jumper JP1 on the IED/UTC card, the Radio
Keying Output activates whenever the RTS line of XCOM1 is asserted.
Refer to Configuring Radio Keying Option on Page 126 for details.
Auxiliary
Digital Output
Auxiliary Digital Output can be used for control functions when use of a
standard digital output is not practical.
For the Electrical Specifications for Auxiliary Digital Outputs see page 154.
Contact wetting must be supplied from a source external to the D25
Note
When operating the Auxiliary Digital Output using WESMAINT, Only On or
Off (latch) commands are supported.
Attempting any other mode of operation will result in an error code being
displayed.
Serial XCOM
Interfaces
If an Ethernet or a Serial XCOM external communication module is installed
in the D25, the XCOM interfaces are designated COM5 and COM6,
respectively.
Serial XCOM
Connection
The Serial XCOM (part numbers 580-0991 and special order 580-0933) cards
have two DB-9-F interfaces, labeled XCOM1 and XCOM2.
They both have these characteristics:
• External power connection
• Programmed via SGConfig for:
− RS-232 or RS-485
− RS-485 2-Wire or 4-Wire
Note: The 2 to 4-Wire wire selection in SGConfig Device Properties only
affects the internal software control (handshaking) of the interface.
It does not change the physical characteristics of the ports.
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