EtherPath-X4 User’s Guide
Appendix B
Port Pin out and Cables
This section describes the serial port pin outs and cables.
RS-232 PIN Assignments
The RJ-45 connectors with RS-232 port wiring contain the signals of a standard PC 9 pin DE-9P COM:
port on a space-saving RJ-45 connector. The RJ-45 connector is wired similar to the RS-561 standard. It
normally operates as a DCE device, however some signals appear as DTE connections. The chart below
details signal directions and names.
NOTE: Ports 1 and 2 have no connection on pin 1 and pin 2.
Control Signal Operation
DTR
Output. This signal is held at the asserted state when a logical connection is present on the ethernet port.
Receive Data
Output, Data from the EtherPath. The port only transmits when it has characters to send and it is not
flowed-off with software or RTS/CTS flow control.
Transmit Data
Input, Data into the EtherPath.
DCD
Input. The EtherPath will only accept virtual connections if this input is asserted or it's configured as
"forced high" in the port configuration. Not connected on port one and port two.
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