Appendix 1: PGA 3510 Common Modbus Registers

This appendix covers Modbus registers most commonly accessed by PGA 3510 users. These are Modbus registers 200 through 227 and their descriptions. There are other Modbus registers used by the PGA 3510. If you need information on other registers, call SSi at (513) 772-0060.

Register Location	Parameter	Description
200	co_data	Measured CO value
201	co2_data	Measured CO₂ value
202	o2_data	Measured 0₂ value
203	ch4_data	Measured CH₄ value
204	Bench_off	Turn off bench, pump, and sample
205	IR_carbon	IR %C
206	IR_COF	Suggested COF (CO Factor)
207	IR_PF	Suggested PF (Process Factor)
208	IR_MV	IR equivalent millivolts
209	probe_MV	Probe millivolts
210	probe_COF	Probe COF
211	probe_temperature	Probe temperature
212	probe_PF	Probe PF
213	probe_carbon	Probe %C
214	pump_run_min	The total time in minutes that the pump has run since the last time memory was cleared or a manual reset took place. This value, plus pump_run_wks, will provide the total amount of time the pump has been running. When this number reaches 10080, pump_run_wks is increased by 1, and pump_run_min is reset to zero.
215	pump_run_wks	The total time in weeks that the pump has run since the last time memory was cleared or a manual reset took place. This value, plus pump_run_min, will provide the total amount of time the pump has been running.
216	pump	Pump status
217	pump_run_now	The time in minutes that the pump is running (reset to zero if pump is turned off). Maximum value is 30000. If pump_run_now is greater than pump_run_max, then pump_run_max is set to pump_run_now.
218	pump_run_max	The longest time in minutes of a pump session. If pump_run_now is greater than pump_run_max, then pump_run_max is set to pump_run_now.
219	calib_status	Calibration status
220	IR_temperature	IR temperature
221	output_percent	Control output in percent
222	sample_flow	Sample flow
223	sample_valve	Sample valve state
224	sample_control	Sample valve control
225	flow_timer	Flow control
226	base_status	Status of base (0=OFF, 1=pump ON, 2=sample delay, 3=measure delay, 4=delay OFF, 5=ON)
227	alarm_bits	Alarm bit map (Bit 0=low flow, Bit 1=base communications, Bit 2=max factor, Bit 3=min factor, Bit 6=programmer alarm, Big 7=high byte is acknowledge; Bit 4 and 5 not used)