Send Message - WIKA D-1-7 Serie Manual De Instrucciones

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.
GB
Below, the encoding of the individual elements is clarified:

Send message

Byte 1 Byte 2
Pressure Pressure
value MSB value
with sign LSB
Measured value
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
Pressure value LSB
Factor
Pressure value MSB (byte 1)
7 6 5 4 3
The representation is not carried out as a two's complement.
16
Byte 3 Byte 4
Factor, Error status
Unit
Bit 6 ... 0 contains the highbyte of the measured value
(Byte 2): contains the lowbyte of the measured value
(Byte 3): contains the measurement type, unit and exponent
Pressure value LSB (byte 2)
2 1 0 7 6 5
WIKA operating instructions pressure transmitter model D-1x-7
Byte 5
Error code
Error detection
4 3 2 1 0
Pressure value
(Note the sign bit and factor)
Pressure value sign
0 = positive
1 = negative
Byte 6 Byte 7
Service Service
request response 1
Services
Byte 8
Service
response 2