4101-2 Modular Controller
3-13
Motherboard LEDs
1 2 3 4
1
2
3
4
5
6
7 8
1
RXD
The amber RXD LED lights when the Controller is receiving a
message via the RS232 comms (CONN1). It is driven directly
by the RS232 RXD logic signal level.
2
TXD
The amber TXD LED lights when the Controller is sending a
message via the RS232 comms (CONN1). It is driven directly
by the RS232 TXD logic signal level.
3
IN
The amber IN LED lights when the Controller is receiving a
message via the RS485 comms (CONN2). It is driven when the
processor detects a valid message address field on the RS485
RX signal.
4
OUT
The amber OUT LED lights when the Controller is sending a
message via the RS485 comms (CONN2). It is driven when the
processor enables the RS485 output circuit.
5
CONFIG
The green CONFIG LED lights for 1 second on power-up and
reset while the Controller performs its configuration routine.
6
STAT
The green STAT (status) LED flashes slowly indicating that the
processor is running. If the input voltage drops to below 10V
but not enough to stall the processor, the STAT LED flashes
quickly (five flashes per second). It flashes twice as fast as
normal when the LEARN jumper is in the LEARN DC position,
and glows steadily when the Controller has leant its
Distributor Code. This LED is connected in parallel to the
STATUS LED visible through the cover, so they both give the
same indication.
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