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How to use Read_Var block with BMXNOC0401 communication module?

See below example of Read_Var block for reading modbus slave data through ETG100.

In ADDM block
3 is the slot adress of NOC module in the rack is the IP address of TSXETG100 gateway.
1 is the modbus slave id
TCP.MBS for addressing a TCP Modbus server

In Read_Var block
’%MW’: for reading holding registers
Num: Index of the first object to read
NB: Number of objects to read
For more details check attached unity help documents.
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