NetLinx Programming
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NX-Series Controllers - WebConsole & Programming Guide
Serial, IR, AxLink, and PoE Port Diagnostics
When a string is sent to a serial port or an IR pulse to an IR port, the X-Series controllers can detect and report if the port being
used is in a fault condition. The controllers can also detect certain fault conditions on the AxLink bus. The following fault conditions
are recognized:
The serial cable is not connected
The Serial pin is connected to another pin
The IR emitter is not connected
The IR emitter is wired backwards
One or both AxLink bus data pins are shorted to power or ground
The maximum power for all PoE ports (72W) has been exceeded or the power supply voltage is outside of the
recommended limits
The maximum current for a single PoE port has been exceeded or the load has disconnected from an individual port
On the first attempt to use a port that is in a fault condition, the controller will do the following:
Quickly flash the front panel LED of the port being used 10 times
Generate an ONERROR data event in NetLinx
Report the error to any Duet Module that has claimed the port
Report the error to RMS if the controller is connected to an RMS server
Set an error flag for that port
The status of the error flag can be queried using the GET FAULT NetLinx command, which will result in a DATA EVENT where the
return status can be parsed.
NOTE: If the fault condition persists, subsequent attempts to use the same port will only result in the quick flashing of the front panel
LED. The ONERROR event and the reporting to a Duet Module or RMS only occur on the first attempt after booting or after the fault
status is cleared. This prevents a flood of redundant error messages when a faulted port is used continuously.
The fault status is cleared on a successful transmission over the port, and also can be cleared manually using the CLEAR FAULT
NetLinx command.
For serial and IR ports, an error condition is only checked at the time the port is used, so unused serial and IR ports will not
generate errors. AxLink bus errors are checked at boot time.
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