Modbus server with flex-server

HI all, i need of a modbus server and im using Modbus-flex server.
the server is configured as figure below

and i write the data in to the holding register

msg.payload = {
'value': [Math.round(msg.pv),Math.round(msg.SP),Math.round(msg.PV_BK)],
'register': 'holding',
'address': 0 ,
'disableMsgOutput' : 0
return msg;

and i see it from the debug of server

but when i read the value from it the result is not the same

Why ?

Maybe the problem is the datatype of number that i put in to the register?

Anyone know the flex modbus server how it work?

thanks in advantage!

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