APPENDIX A Model 200E Instruction Manual
Signal Name Bit or Channel
Number
Description
ST_ZERO_CAL 3 0 = in zero calibration
1 = not in zero
ST_SPAN_CAL 4 0 = in span calibration
1 = not in span
ST_DIAG_MODE 5 0 = in diagnostic mode
1 = not in diagnostic mode
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
RCELL_HEATER 1 0 = reaction cell heater on
1 = off
CONV_HEATER 2 0 = converter heater on
1 = off
MANIFOLD_HEATER
2
3 0 = bypass or dilution manifold heater on
1 = off
IZS_HEATER 4 0 = IZS heater on
1 = off
5 Spare
SPAN_VALVE 6 0 = let span gas in
1 = let zero gas in
CAL_VALVE 7 0 = let cal. gas in
1 = let sample gas in
AUTO_ZERO_VALVE 8 0 = let zero air in
1 = let sample gas in
NOX_VALVE 9 0 = let NO
X
gas into reaction cell
1 = let NO gas into reaction cell
10-15 Spare
Rear board primary MUX analog inputs, MUX default I/O address 32A hex
PMT_SIGNAL 0 PMT detector
244 044100110 Rev A
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