1-15
1
1.12
INDICATORS
The board has six diagnostic LEDs that display the following conditions:
PWR
- Indicates power on.
RDY
- Indicates unit has passed self test.
TALK/TX
- Indicates unit has recognized its talk address or
is transmitting a serial message.
LSTN/RX
- Indicates unit has recognized its listen address
or is receiving a serial message.
SRQ/SRM
- Indicates unit is generating an SRQ.
ERR
- Indicates unit has detected an command error
and the command was not executed or the
Flash is corrupted.
When the board is turned on, it performs an internal self test which takes
about 0.4 seconds. The PWR indicator is on during selftest. At the end of
the self test, the unit displays its current serial network address setting by
blinking a binary pattern on the LEDs. The LED bit weights are:
RDY TALK/TX LSTN/RX SRQ/SRM ERR
16
8
4
2 1
Any errors found during self test are indicated by a repeated blinking of the
error code pattern. Refer to Table 5-3 for a description of the self test errors
and their possible causes. When all of the LEDs except the ERR LED blink
on for 1 second, the unit is writing configuration parameters to the Flash
memory. When all of the LEDs blink on for 1 second, the unit is initializing
the Flash memory to factory defaults
1.13
EXTERNAL RESET INPUT
The -ExtRst is a low true input with a 33 Kohm pullup that is used to reset
the unit. The unit is held in the reset state while -ExtRst is low.
