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APPENDIX A-4: Signal I/O Definitions, Software Version C.0
M703E Calibrator Operator’s Manual
A-20 05745 Rev C
M703E I/O Signal List for Latest Revision
Signal Name
Bit or
Channel
Number
Description
PHOTO_REF_VALVE
6
0 = photometer valve in reference position
1 = measure position
ZA_SHUTOFF_VALVE
7 0 = open zero air shutoff valve
1 = close
O3_PUMP_ON
8 0 = pump on for photometer to measure O
3
1 = off
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
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)
SEQUENCE_LED
8 (output) 0 = sequence LED on (executing sequence)
1 = off
AUTO_TIMER_LED
9 (output) 0 = automatic timer LED on (automatic sequence timer enabled)
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
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
PHOTO_SAMP_PRES
3 Photometer sample pressure
4 Temperature MUX
REGULATOR_PRESS
5 Regulator pressure
PHOTO_FLOW
6 Photometer flow
7–8 Spare
REF_4096_MV
9 4.096V reference from MAX6241
10-11 Spare
OUTPUT_FLOW
12 Output flow
13 Spare
14 DAC loopback MUX
REF_GND
15 Ground reference
Rear board temperature MUX analog inputs
BOX_TEMP
0 Internal box temperature
PHOTO_SAMP_TEMP
1 Photometer sample temperature