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PR 5500 Instrument Manual
ModBus Protocol
Sartorius EN-421
7.2 ModBus-RTU
A serial interface is used for connection.
The telegram consists of four blocks:
Addr
8
Func
8
<data>
Crc
16
Legend
Addr
8
Slave device address within a range of 0 or 1 to 247
Func
8
Function code
<data>
Additional data (see Chapter 7.4)
Crc
16
Checksum of all preceding characters
Note
A telegram sent to Slave 0 is executed by all ModBus participants, but replied by none of
these devices.
At 9600 baud, the reply time is typically 4 ms and a max. of 8 ms.
A faulty command received by device (e.g., parity error in the data, or CRC error) is ignored and no reply is sent.
The pauses between the individual characters and a command must not exceed the 3.5-fold value of a character
length; otherwise device detects a premature end of the command.
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