- Modbus Server and Client programs using Python-3
server.py
client.py
- Installation:
sudo pip3 install modbus
Usage Examples:
- Server:
sudo python3 -m modbus.server …to run server in commandline
For Register Read, the server sends value starting from 1 and incrementing upto 6000. For example, the client wants to read with FuncCode=3, Address=0, and Length=4. Then the server’s reply for values will be 1,2,3,4 for the first read and values will increment for every subsequent read.
For Coil Reads, the server sends back values 85,86… for the required length.
- Client:
from modbus.client import *
c = client() …if host = ‘localhost’
c = client(host=’HOSTNAME’) …Change HOSTNAME to Server IP address
c.read() …To read 10 Input Registers from Address 0
c.read(FC=3, ADR=10, LEN=8) …To read 8 Holding Registers from Address 10
c.write(11,22,333,4444) …To write Holding Registers from Address 0
c.write(11,22,333,4444, ADR=10) …To write Holding Registers from Address 10 c.write(11,22, FC=15, ADR=10) …To write Coils from Address 10
fc() …To get the supported Function Codes
- Supported Function Codes:
1 = Read Coils or Digital Outputsn
2 = Read Digital Inputsn
3 = Read Holding Registersn
4 = Read Input Registersn
5 = Write Single Coiln
6 = Write Single Registern
15 = Write Coils or Digital Outputsn
16 = Write Holding Registers”)
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Release files for modbus 3.2
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