Xylem H-3551 - Manual (Page 22)

5-4 SDI-12 Command and Response Protocol
H-3551
The aM1! causes the H-3351 to initiate a measurement . This command takes less than 3 seconds
to complete and places 5 parameters in the sensor buffer.
Example of a H-3551 "aM1!" command:
Command Response Time Values Description
"aM1!" "a0035" 3 sec 5 Initiate a measurement
Subsequent Command Response
"aD0" a+AA.AAA+BB.BBB+CC.CCC+DD.DD+EE.EE
where: AA.AAA = Tank pressure (PSI)
BB.BBB = Line pressure (PSI)
CC.CCC = Sensor temperature (°C)
DD.DD = System battery voltage (volts)
EE.EE = Pump battery voltage (volts)
The aM2! causes the H-3351 to initiate a measurement . This command takes less than 3 seconds
to complete and places 8 parameters in the sensor buffer. This command is normally used only for
calibration and test during manufacturing.
Example of a H-3551 "aM2!" command:
Command Response Time Values Description
"aM2!" "a0038" 3 sec 8 Initiate a measurement
Subsequent Command Response
"aD0" a+AA.AA+BB.BB+CCCC+DDDD+EE.EE+FF.FF+GGGG+HHHH
where: AA.AA = Tank pressure (PSI)
BB.BB = Tank temperature (°C)
CCCCC = Tank pressure (raw A/D counts)
DDDDD = Tank temperature (raw A/D counts)
EE.EE = Line pressure (PSI)
FF.FF = Line temperature (°C)
GGGGG = Line pressure (raw A/D counts)
HHHHH = Line temperature (raw A/D counts)