
M1 – M3 Display units
Page 78
13. MODBUS RTU Protocol
This protocol allows to connect the M3 to a compatible PLC. A maximum of 256
register can be read.
Example of a RTU Modbus communication with an automate Pro-Face. This example can be download
from our website
www.metro-fr.com
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 characteristic
- 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
Address Size
(word)
Value
Preset (W)
0
1
1
Start a dynamic measure (W)
1
1
1
Active programm (R/W)
4
1
0 or 1
Life word (change each 100ms) (R)
6
1
0 or 1
Stop
7
1
1
Содержание M1
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Страница 38: ...M1 M3 Display units Page 38 Grey color because of the class parameters ...
Страница 44: ...M1 M3 Display units Page 44 7 98 8 02 Write here the 2 calibration values which will be used ...
Страница 50: ...M1 M3 Display units Page 50 MB 8I Module Inductif MB 4D Module For Digimatic insturments MB 1R Module RS232 ...