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Klinger CMF
Instruction Manual
Page 52
See figure 6-8
On-line Menu\
Device setup\
Review
Model
Manufacturer
Write protect
Dev id
Cfg chng count
Max dev vars
Tag
Long tag
Descriptor
Message
Date
Final asmbly num
Universal rev
Fld dev rev
Software rev
Poll rev
Poll addr
Loop current mode
Num req preams
Num resp preams
Figure 6-8 Review
6.2 Modbus RS485 communication
6.2.1 Brief introduction of Modbus RTU protocol
Walsn mass flow meters are equipped with the ability to use the Modbus communication
protocol (RTU format). Users can use this feature to read and write parameters to/from the
transmitter
6.2.1.1 Reading N variables
6.2.1.1.1 To send the request
Instrument address +0X03+ register start address (2 bytes, upper byte in front) +
register read and write quantity 2*N (2 bytes, upper byte in front) +CRC check code (2
bytes, low-order byte in front).
6.2.1.1.2 Response
Instrument a0X03+ the number of bytes in data 4*N (1 byte) + register data
(4*N bytes, upper byte in front) +CRC parity code (2 bytes, low-order byte in front).
6.2.1.2 Writing N variables
6.2.1.2.1 To send the request
Instrument function code 0x10+ initial address register (2 bytes, the
high-order byte in front) + register read and write number 2*N (2 bytes, the
high-order byte data in front) + the number of bytes 4*N (1 byte) + data to be written
(4*N bytes, upper byte in front) + CRC check code (2 bytes, the low order byte in
front).
6.2.1.2.2 Response
Instrument function code 0x10+ initial address register (2 bytes, the
high-order byte in front) + register read and write number 2*N (2 bytes, the
