
Troubleshooting
56 RTU Open
If you have problems mounting, wiring, or addressing the RTU Open, contact Carrier Control Systems Support.
If you need the RTU Open's serial number when troubleshooting, the number is on:
• a sticker on the back of the main controller board
• a Module Status report (modstat) from your user interface
The LED's on the RTU Open show the status of certain functions.
The RTU Open has power
The RTU Open is receiving data from the network segment
The RTU Open is transmitting data over the network segment
The binary output is active
The
and
LED's indicate controller and network status.
2 flashes per second Off Normal
2 flashes per second 2 flashes,
alternating with
LED
Five minute auto-restart delay
after system error
2 flashes per second 3 flashes, then off The controller has just been
formatted
2 flashes per second On Exec halted after frequent system
errors or control programs halted
5 flashes per second Off Firmware transfer in progress,
Boot is running
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