WIKA D-11-7 - Manual (Page 16)

16 WIKA operating instructions pressure transmitter model D-1x-7
2478159.05 12/2011 GB/D/F/E
GB
6. Commissioning, operation
6.3 Message structure
In the send message the transmission of the measured value, error detection and service requests are
combined. The D-1x-7 supports only DP-V0 and therefore a cyclic data exchange.
Below, the encoding of the individual elements is clarified:
The representation is not carried out as a two's complement.
Send message
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8
Pressure
value MSB
with sign
Pressure
value
LSB
Factor,
Unit
Error status Error code Service
request
Service
response 1
Service
response 2
Measured value Error detection Services
Measured value
Number format of the measured value: 16 bit integer (sign and magnitude representation)
Pressure value MSB (Byte 1): Bit 7 contains the algebraic sign
Bit 6 ... 0 contains the highbyte of the measured value
Pressure value LSB (Byte 2): contains the lowbyte of the measured value
Factor (Byte 3): contains the measurement type, unit and exponent
Pressure value MSB (byte 1) Pressure value LSB (byte 2)
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
Pressure value
(Note the sign bit and factor)
Pressure value sign
0 = positive
1 = negative