Bryant 551J installation instructions LEDs on the RTU-MP show the status of certain functions

		Table 4 – LEDs
	The LEDs on the RTU-MP show the status of certain functions
If this LED is on...		Status is...
Power		The RTU MP has power
Rx		The RTU MP is receiving data from the network segment
		The RTU MP is transmitting data over the network segment
Tx
		The digital output is active
DO#
	The Run and Error LEDs indicate control module and network status

551J

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If Run LED shows...	And Error LED shows...
2 flashes per second	Off
2 flashes per second	2 flashes,
	alternating with Run LED
2 flashes per second	3 flashes,
	then off
2 flashes per second	4 flashes,
	then pause
2 flashes per second	On
5 flashes per second	On
5 flashes per second	Off
7 flashes per second	7 flashes per second, alternating with
	Run LED
14 flashes per second	14 flashes per second,
	alternating with Run LED
On	On

Status is...

Normal

Five minute auto---restart delay after system error

Control module has just been formatted

Two or more devices on this network have the same ARC156 network address

Exec halted after frequent system errors or control programs halted

Exec start---up aborted, Boot is running Firmware transfer in progress, Boot is running

Ten second recovery period after brownout

Brownout

Failure. Try the following solutions:

STurn the RTU---MP off, then on. S Format the RTU---MP.

S Download memory to the RTU---MP. S Replace the RTU---MP.

NOTE: Contact your Bryant applications engineer for details on configuration of RTU-MP, operating sequences and troubleshooting information, as well as details on configuration and troubleshooting of connected networks.

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