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APPENDIX A-4: Signal I/O Definitions Teledyne API - T300/T300M and M300E/EM PN 04906H (DCN5840)
A-28
Signal Name Bit or Channel
Number
Description
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 (PCF8574), 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
WHEEL_HTR 1 0 = wheel heater on
1 = off
BENCH_HTR 2 0 = optical bench heater on
1 = off
O2_CELL_HEATER
5
3 0 = O
2
sensor cell heater on
1 = off
BOX2_HEATER
3
,
OVEN_HEATER
15
3 0 = internal box temperature #2/oven heater on
1 = off
CAL_VALVE 4 0 = let cal. gas in
1 = let sample gas in
SPAN_VALVE 5 0 = let span gas in
1 = let zero gas in
ZERO_SCRUB_VALVE
2,3
6 0 = open zero scrubber valve
1 = close
SHUTOFF_VALVE 6
7
3,15
0 = energize shutoff valve
1 = de-energize
IR_SOURCE_ON 7
n/a
3,15
0 = IR source on
1 = off
04188D DCN5752