Honeywell Mercury User Manual page 9

Power Up and Self Test:
When power is first applied to the Modem LED #1, #6 and
#7 will light up and stay lit for about three seconds. Ignore
LED #4 and #8; their states are not set and will change during
power up.
Standby:
LED #4 then LED #3 will light up momentary and then go
off; LED #1 and #7 will light up and stay lit for about six
seconds then go off.
Power Down:
All LEDs' are off.
7.
TB1, Modem Hookup:
Modem TB1
A-
A+
RX
TX
GND
Modem TB1
A-
A+
RX
TX
GND
1 5
2 6
3 7
4 8
1 5
2 6
3 7
4 8
ECAT
SCIB TB1
C
T
R
ER, Mainboard TB1
A-
A+
RX
TX
GND
PULSE BRD
A-
A+
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