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APPENDIX A-4: M400E Signal I/O Definitions, Revision .2
Model 400E Instruction Manual
SIGNAL NAME
BIT OR
CHANNEL
NUMBER
DESCRIPTION
REF_4096_MV
9
4.096V reference from MAX6241
10–11
Spare
O3_SCRUB_TEMP 12
O
3
scrubber temperature
13
Spare
14 DAC
loopback
MUX
REF_GND 15
Ground
reference
Rear board temperature MUX analog inputs
BOX_TEMP 0
Internal
box
temperature
SAMPLE_TEMP 1
Sample
temperature
PHOTO_LAMP_TEMP
2
Photometer lamp temperature
O3_GEN_TEMP 3
O
3
generator lamp temperature
4–5
Spare
TEMP_INPUT_6
6
Diagnostic temperature input
TEMP_INPUT_7
7
Diagnostic temperature input
Rear board DAC MUX analog inputs
DAC_CHAN_0
0
DAC channel 0 loopback
DAC_CHAN_1
1
DAC channel 1 loopback
DAC_CHAN_2
2
DAC channel 2 loopback
DAC_CHAN_3
3
DAC channel 3 loopback
Rear board analog outputs
CONC_OUT_1
0
Concentration output #1
CONC_OUT_2
1
Concentration output #2
2
Spare
TEST_OUTPUT
3
Test measurement output
I
2
C analog output (AD5321), default I
2
C address 18 hex
PHOTO_LAMP_DRIVE 0
O
3
photometer lamp drive (0–5V)
I
2
C analog output (AD5321), default I
2
C address 1A hex
O3_GEN_DRIVE 0
O
3
generator lamp drive (0–5V)
1
Internal span option.
18
0
4402
Rev C.3