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Byte Transmission Sequence; Modbus Data Map - Endress+Hauser Proline Prosonic Flow I 400 Operating Instructions Manual

Ultrasonic time-of-flight flowmeter modbus rs485
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Proline Prosonic Flow I 400 Modbus RS485
Endress+Hauser
9.3.5

Byte transmission sequence

Byte addressing, i.e. the transmission sequence of the bytes, is not specified in the Modbus
specification. For this reason, it is important to coordinate or match the addressing
method between the master and slave during commissioning. This can be configured in
the measuring device using the Byte order parameter.
The bytes are transmitted depending on the selection in the Byte order parameter:
FLOAT
Sequence
Options
1.
1 – 0 – 3 – 2 *
Byte 1
(MMMMMMMM)
0 – 1 – 2 – 3
Byte 0
(MMMMMMMM)
2 – 3 – 0 – 1
Byte 2
(EMMMMMMM)
3 – 2 – 1 – 0
Byte 3
(SEEEEEEE)
* = factory setting, S = sign, E = exponent, M = mantissa
INTEGER
Options
1 – 0 – 3 – 2 *
3 – 2 – 1 – 0
0 – 1 – 2 – 3
2 – 3 – 0 – 1
* = factory setting, MSB = most significant byte, LSB = least significant byte
STRING
Presentation taking the example of a device parameter with a data length of 18 bytes.
Sequence
Options
1.
1 – 0 – 3 – 2 *
Byte 17
3 – 2 – 1 – 0
(MSB)
0 – 1 – 2 – 3
Byte 16
2 – 3 – 0 – 1
* = factory setting, MSB = most significant byte, LSB = least significant byte
9.3.6

Modbus data map

Function of the Modbus data map
The device offers a special memory area, the Modbus data map (for a maximum of 16
device parameters), to allow users to call up multiple device parameters via Modbus RS485
and not only individual device parameters or a group of consecutive device parameters.
Grouping of device parameters is flexible and the Modbus master can read or write to the
entire data block simultaneously with a single request telegram.
2.
3.
Byte 0
Byte 3
(MMMMMMMM)
(SEEEEEEE)
Byte 1
Byte 2
(MMMMMMMM)
(EMMMMMMM)
Byte 3
Byte 0
(SEEEEEEE)
(MMMMMMM)
Byte 2
Byte 1
(EMMMMMMM)
(MMMMMMMM)
Sequence
1.
Byte 1
(MSB)
Byte 0
(LSB)
2.
...
Byte 16
...
Byte 17
...
(MSB)
System integration
4.
Byte 2
(EMMMMMMM)
Byte 3
(SEEEEEEE)
Byte 1
(MMMMMMM)
Byte 0
(MMMMMMMM)
2.
Byte 0
(LSB)
Byte 1
(MSB)
17.
18.
Byte 1
Byte 0
(LSB)
Byte 0
Byte 1
(LSB)
71

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