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12. MODBUS RTU Protocol
This process allows to connect the M3 to a compatible and programmable automate.
This process allows to control all the functionality of the M3 thanks to a lot of register.
A maximum of 256 register can be read.
Example of a RTU Modbus communication with an automate Pro-Face.
Address: always equal to1
Code: the M3 supports codes « 3 » by reading and « 16 » by written
Data: 1 to 256 register
CRC16: verification code on 2 octets
The following functionality are available:
- Reading of the position of 2 probes
- Instant reading of the value of 2 characteristics
- Preset
- Reading / programing of the tolerances, of the master value, the formula...
Register are compounded by one or a couple of 16 bits words.
Function
Preset (W)
Start a dynamic measure (W)
Active program (R/W)
Life word (change each 100ms) (R)
Stop
Active M3
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M1 – M3 Display Units
Address
Size
(word)
0
1
1
1
4
1
6
1
7
1
8
1
Value
1
1
0 or 1
0 or 1
1
1 = measure
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