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Teledyne API - Models T400 and 400E (04402F DCN6340)APPENDIX A-4: T400 and M400E Signal I/O Definitions, Revision 1.0.0/E.3
A-21
SIGNAL NAME
BIT OR
CHANNEL
NUMBER
DESCRIPTION
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
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_1
0 DAC channel 0 loopback
DAC_CHAN_2
1 DAC channel 1 loopback
DAC_CHAN_3
2 DAC channel 2 loopback
DAC_CHAN_4
3 DAC channel 3 loopback
06870C DCN6332