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APPENDIX A-4: M400E Signal I/O Definitions, Revision D.4 Model 400E Instruction Manual
SIGNAL NAME
BIT OR
CHANNEL
NUMBER
DESCRIPTION
ST_DIAG_MODE
0
0 = in diagnostic mode
1 = not in diagnostic mode
ST_LOW_SPAN_CAL
1
0 = in low span calibration
1 = not in low span
ST_LAMP_ALARM
2
0 = any lamp alarm
1 = all lamps OK
3–7 Spare
Front panel I
2
C keyboard, default I
2
C address 4E hex
MAINT_MODE
5 (input)
0 = maintenance mode
1 = normal mode
LANG2_SELECT
6 (input)
0 = select second language
1 = select first language (English)
SAMPLE_LED
8 (output)
0 = sample LED on
1 = off
CAL_LED
9 (output)
0 = cal. LED on
1 = off
FAULT_LED
10 (output)
0 = fault LED on
1 = off
AUDIBLE_BEEPER
14 (output)
0 = beeper on (for diagnostic testing only)
1 = off
Relay board digital output (PCF8575), default I
2
C address 44 hex
RELAY_WATCHDOG
0
Alternate between 0 and 1 at least every 5 seconds to keep
relay board active
O3_SCRUB_HEATER
1
0 = O
3
scrubber heater on
1 = off
2–5 Spare
SPAN_VALVE
6
0 = let span gas in
1 = let zero gas in
PHOTO_REF_VALVE
7
0 = photometer valve in reference position
1 = measure position
CAL_VALVE
8
0 = let cal. gas in
1 = let sample gas in
9–13 Spare
PHOTO_LAMP_HEATER
14
0 = O
3
photometer lamp heater on
1 = off
O3_GEN_HEATER
15
0 = O
3
generator lamp heater on
1 = off
Rear board primary MUX analog inputs
PHOTO_DET
0 Photometer detector reading
O3_GEN_REF_DET
1 O
3
generator reference detector reading
2 Spare
SAMPLE_PRESSURE
3 Sample pressure
4 Temperature MUX
5 Spare
SAMPLE_FLOW
6
Sample flow
TEST_INPUT_7
7 Diagnostic test input
TEST_INPUT_8
8 Diagnostic test input
REF_4096_MV
9 4.096V reference from MAX6241
10–11 Spare
A-20 04402 Rev D.4