Bryant 548J Service And Maintenance Instructions page 42

RTU- -MP Troubleshooting
Communication LEDs
The LEDs on the RTU- - MP (see Fig. 46) indicate if the
controller is speaking to the devices on the network. The
LEDs should reflect communication traffic based on the
If this LED is on...
Power
Rx
Tx
DO#
If Run LED shows...
2 flashes per second
2 flashes per second
2 flashes per second
2 flashes per second
2 flashes per second
5 flashes per second
5 flashes per second
7 flashes per second
14 flashes per second
On
Fig. 64 - - BACview
Table 16 – RTU- - MP LEDs
The LEDs on the RTU ---MP show the status of certain functions
Status is...
The RTU MP has power
The RTU MP is receiving data from the network segment
The RTU MP is transmitting data over the network segment
The digital output is active
The Run and Error LEDs indicate control module and network status
And Error LED shows...
Off
2 flashes,
alternating with Run LED
3 flashes,
then off
4 flashes,
then pause
On
On
Off
7 flashes per second, alternating with
Run LED
14 flashes per second,
alternating with Run LED
On
6
Handheld Connections
baud rate set. The higher the baud rate the more solid the
LEDs will appear. See Table 16 for further information.
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:
S
S
S
S
42
Turn the RTU ---MP off, then on.
Format the RTU ---MP .
Download memory to the RTU ---MP .
Replace the RTU ---MP .
C07170