Hi,

I have similar problem i use the ATC-2000 converter without the Modbus RTU>TCP translation. Now I try to find the solution like Vcom on S7-1200. it is possible to get from you the code? 

EDIT: 

More explanation:

I would like to use ATC-2000 (serial to Ethernet converter) to establish communication between S7-1212 and Zamel RXM-01 (home automation Modbus<->"exta free" translator)

the simplest way will be to buy Modbus getaway or CM1241 but its cost. 

One of my ideas is to calculate frame by the Modbus_master block from lib. and copy from the temp and after that paste to temp in MB_Client.

It is possible or maybe you have another solution. 

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Split from Connect EKI-1521 Gateway module with S7-1500 over ethernet.