Rosemount 2700, Instruction Manual, Page: 38 / 94

A-4
MODEL 2700 APPENDIX A
SERIAL COMMUNICATIONS PROTOCOL
Example:
Instrument Address = 1
Byte type
Address 06DFH
Data 03H
To 2700 81H 6EH 42H 23H 30H 36H 44H 46H
From 2700 81H 6EH 42H 23H 30H 36H 44H 46H 30H 33H
‘B’ ‘#’ ‘0’ ‘6’ ‘D’ ‘F’ ‘0’ ‘3’
Example:
Instrument Address = 1
Floating-point type
Address 08AAH (Sensor 1 Primary Measurement)
Data 2319A736
Measurement value 4.979914 x 10^-6
To 2700 81H 6EH 46H 23H 30H 38H 41H 41H
From 2700 81H 6EH 46H 23H 30H 38H 41H 41H 32H 33H
‘F’ ‘#’ ‘0’ ‘8’ ‘A’ ‘A’ ‘2’ ‘3’
Continued 31H 39H 41H 37H 33H 36H
‘1 ‘9’ ‘A’ ‘7’ ‘3’ ‘6’
Measurement value format is floating-point which corresponds to IEEE Std 754-1985.
F7 F6 F5 F4 F3 F2 F1 F0
‘2 ‘3’ ‘1’ ‘9’ ‘A’ ‘7’ ‘3’ ‘6’
F7 F6 F5 F4
2’ ‘3’ ‘1’ 9’
M07 M06 M05 M04 M03 M02 M01 M00 M15 M14 M13 M12 M11 M10 M09 M08
0 0 1 0 0 0 1 1 0 0 0 1 1 0 0 1
F3 F2 F1 F0
‘A’ ‘7’ ‘3’ ‘6’
E00 M22 M21 M20 M19 M18 M17 M16 S00 E07 E06 E05 E04 E03 E02 E01
1 0 1 0 0 1 1 1 0 0 1 1 0 1 1 0
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 = 0 1 1 0 1 1 0 1
= 109
mantissa = (0 1 0 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 0 0 1 1)/2^23
= ( 2 7 1 9 2 3 )/2^23
= (271923 hex) / 2^23
= (2562339) / 8388608
= 0.3054546