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Models T802, 802E Appendix A Menu Trees (Reference: 06530C DCN6418) Appendix A
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Signal Name Bit or Channel
Number
Description
A status outputs, U24, J1017, pins 1–8 = bits 0–7, default I/O address 323 hex
ST_SYSTEM_OK 0 0 = system OK
1 = any alarm condition
ST_CONC_VALID 1 0 = conc. valid
1 = warnings or other conditions that affect validity of
concentration
ST_CAL_MODE 2 0 = in calibration mode
1 = in measure mode
ST_CAL_SPAN 3 0 = calibrating span
1 = calibrating zero
ST_CAL_RANGE2 4 0 = calibrating range 2
1 = calibrating range 1
ST_CAL_CO2
1
5 0 = calibrating CO
2
1 = calibrating O
2
6–7 Spare
B status outputs, U27, J1018, pins 1–8 = bits 0–7, default I/O address 324 hex
0–7 Spare
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 (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
1–3 Spare
CO2_CELL_HEATER
2
4 0 = CO
2
sensor cell heater on
1 = off
O2_CELL_HEATER
4
5 0 = O
2
sensor cell heater on
1 = off
CAL_VALVE
6
6 0 = let cal. gas in
1 = let sample gas in
O2_SPAN_VALVE
4, 6
7 0 = let O
2
span gas in
1 = let zero gas in
07275B DCN6418