The TRB140 does feature a programmable Input/Output (I/O) pin accessible via the 4-pin power connector, which can be configured as either a digital input or an open collector (OC) output.
However, the TRB140 does not natively support enabling or disabling the Ethernet port via its I/O pins. The Ethernet interface is designed to be continuously active when the device is powered. While the I/O pin can be used for various control and monitoring purposes, directly controlling the power state of the Ethernet port through this method is not supported.
An external solution, or a custom script may be viable for this configuration, however we have not tested our device for such circumstances.