A-5
MODEL 2700 APPENDIX A
SERIAL COMMUNICATIONS PROTOCOL
measurement value = (-1)^0 * 2^(109-127) * 1.3054546
= 4.979914 x 10^-6
Example:
Instrument Address = 1
Floating-point type
Address 08AEH (Sensor 1 Secondary Measurement)
Data 0000CC41H
Measurement value 25.5
To 2700 81H 6EH 46H 23H 30H 38H 41H 45H
From 2700 81H 6EH 46H 23H 30H 38H 41H 45H 30H 30H
‘F’ ‘#’ ‘0’ ‘8’ ‘A’ ‘E’ ‘0’ ‘0’
Continued 30H 30H 43H 43H 34H 31H
‘0’ ‘0’ ‘C’ ‘C’ ‘4’ ‘1’
Measurement value format is floating-point which corresponds to IEEE Std 754-1985.
F7 F6 F5 F4 F3 F2 F1 F0
‘0’ ‘0’ ‘0’ ‘0’ ‘C’ ‘C’ ‘4’ ‘1’
F7 F6 F5 F4
‘0’ ‘0’ ‘0’ ‘0’
M07 M06 M05 M04 M03 M02 M01 M00 M15 M14 M13 M12 M11 M10 M09 M08
0000 00 00 0000 0000
F3 F2 F1 F0
‘C’ ‘C’ ‘4’ ‘1’
E00 M22 M21 M20 M19 M18 M17 M16 S00 E07 E06 E05 E04 E03 E02 E01
1100 11 00 0100 0001
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
sign = 0
exponent = 1 0 0 0 0 0 1 1
= 131
mantissa = (1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0) / 2^23
= (4C0000 hex) / 2^23
= (4980736) / 8388608
= 0.59375
measurement value = (-1)^0 * 2^(131-127) * 1.59375
= 25.5
1.3.3 Reset Instrument 72H/114
To 2700 ADDR CMD
From 2700 ADDR CMD
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