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APPENDIX A-4: M Signal I/O Definitions
Signal Name
B status outputs, U27, J1018, pins 1–8 = bits 0–7, default I/O address 324 hex
15
ST_CO2_CAL
MAINT_MODE
LANG2_SELECT
SAMPLE_LED
CAL_LED
FAULT_LED
AUDIBLE_BEEPER
RELAY_WATCHDOG
RCELL_HEATER
CONV_HEATER
10
MANIFOLD_HEATER
IZS_HEATER
15
CO2_CELL_HEATER
11
O2_CELL_HEATER
SPAN_VALVE
3
ZERO_VALVE
CAL_VALVE
AUTO_ZERO_VALVE
NOX_VALVE
4
NO2_CONVERTER
A-16
Bit or Channel
Number
0
1–7
2
Front panel I
C keyboard, default I
5 (input)
6 (input)
8 (output)
9 (output)
10 (output)
14 (output)
Relay board digital output (PCF8575), default I
0
1
2
3
4
5
6
7
8
9
T200H/M and 200EH/EM Menu Trees (05147J DCN7141)
Description
0 = in CO
calibration mode
2
1 = in measure or other calibration mode
Spare
2
C address 4E hex
0 = maintenance mode
1 = normal mode
0 = select second language
1 = select first language (English)
0 = sample LED on
1 = off
0 = cal. LED on
1 = off
0 = fault LED on
1 = off
0 = beeper on (for diagnostic testing only)
1 = off
2
C address 44 hex
Alternate between 0 and 1 at least every 5 seconds to keep
relay board active
0 = reaction cell heater on
1 = off
0 = converter heater on
1 = off
0 = bypass or dilution manifold heater on
1 = off
0 = IZS heater on
1 = off
0 = CO
sensor cell heater on
2
1 = off
0 = O
sensor cell heater on
2
1 = off
0 = let span gas in
1 = let zero gas in
0 = let zero gas in
1 = let sample gas in
0 = let cal. gas in
1 = let sample gas in
0 = let zero air in
1 = let sample gas in
0 = let NO
gas into reaction cell
X
1 = let NO gas into reaction cell
0 = turn on NO
converter (measure NO
2
1 = turn off NO
converter (measure NO)
2
)
x
07270D DCN7141
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