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I have another nice tool for Modbus Master/Slave Software which i use for testing Modbus comms via TCP and RS232/485 with S7 CP341 PLCs.
It works very well.
It doesn't need ay crack or patch or sn.
No need for installation,just unrar and use.
let others enjoy another tool.

The Open modbus on TCP/IP for STEP 7
Quote:
OPEN MODBUS / TCP Communication via CP343-1 and CP443-1
Simple configuration/parameter definition
The CP343-1 and CP443-1 communications processors and the associated communication links are configured as usual using SIMATIC STEP 7 or the SIMATIC PCS 7 configuration interface. MODBUS-specific parameters can be defined very straightforwardly in the MODBUS function block.

Ordering data
OPEN MODBUS/TCP – single-user licence: (valid for one SIMATIC station)
Order no: 2XV9 450-1MB00