APPENDIX A-4: Signal I/O Definitions for 300E Series Analyzers, Revision G.4 Model 360E Instruction Manual
SIGNAL NAME BIT OR CHANNEL
NUMBER DESCRIPTION
1 = not in span
ST_DIAG_MODE 5
0 = in diagnostic mode
1 = not in diagnostic mode
ST_CONC_ALARM_1
2 6 0 = conc. limit 1 exceeded
1 = conc. OK
ST_CONC_ALARM_2
2 7 0 = conc. limit 2 exceeded
1 = conc. OK
B status outputs, U27, J1018, pins 18 = bits 07, default I/O address 324 hex
ST_AUTO_REF 2, 3 0
0 = in auto-reference mode
1 = not in auto-reference mode
1–7 Spare
Front panel I2C keyboard, default I2C 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 I2C 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 = O2 sensor cell 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_VALV
E 2 6 0 = open zero scrubber valve
1 = close
SHUTOFF_VALVE 6 0 = energize shutoff valve
1 = de-energize
IR_SOURCE_ON 7
0 = IR source on
1 = off
Rear board primary MUX analog inputs
SAMPLE_PRESSURE 0 Sample pressure
VACUUM_PRESSURE
6 1 Vacuum pressure
PURGE_PRESSURE 9,
10 1 Purge pressure
CO_MEASURE 2 Detector measure reading
CO_REFERENCE 3 Detector reference reading
A-26 05233 Rev G.4