A-7
MODEL 2700 APPENDIX A
SERIAL COMMUNICATIONS PROTOCOL
To 2700 81H 73H
From 2700 81H 73H 41H 31H 47H 41H 32H 45H 53H 30H 38H
‘A’ ‘1’ ‘G’ ‘A’ ‘2’ ‘E’ ‘S’ ‘0’ ‘8’
Continued 0DH
CR
‘0’ ‘8’
D07 D06 D05 D04 D03 D02 D01 D00
0000 1000
D03 DISPLAY FAILURE
1.3.6 Send Measurement 6CH/108
To 2700 ADDR CMD SNRM SNRL
From 2700 ADDR CMD SNRM SNRL A7 A6 A5 A4 A3 A2 A1 A0
Continued B7 B6 B5 B4 B3 B2 B1 B0
ADDR: Instrument Address
CMD: 6CH
SNRM: Sensor Address Most Significant Byte; always ‘0’
SNRL: Sensor Address Least Significant Byte; ‘0’ to ‘7’ (Sensor1 to
Sensor8) or FFH (Dual)
An: Measurement for Sensor; Dual Measurement for Dual
Bn: Temperature for Sensor; Secondary Display for Dual
From IEEE Std 754-1985:
measurement value = (-1)^sign * 2^(exponent-127) * 1.mantissa
sign = S00
exponent = E07 E06 E05 E04 E03 E02 E01 E00
mantissa = M22 M21 M20 M19 M18 M17 M16 M15 M14 M13 M12 M11 M10 M09
M08 M07 M06 M05 M04 M03 M02 M01 M00) / 2^23
Floating-Point measurement values are in the following units:
Measurement Units
Concentration per cent
Conductivity Siemens/centimeter
Dissolved Solids ppm-TDS
Dual\Difference Siemens/centimeter
Dual\Ratio per cent
Dual\%Pass,%Reject per cent
Temperature degrees Celsius
pH pH
mV-ORP mV
Example:
Instrument Address = 1
Floating-point type
Sensor 1
Primary Measurement Data 2319A736H
Secondary Measurement Data 0000CC41H
Primary Measurement value 4.979914 x 10^-6
Secondary Measurement value 25.5
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