TRB145 Modbus RTU sending alarm sms

for a project we bought a TRB145 FW TRB1_R_00.07.06.4.

At the moment I try to communicate to the device via QModMaster SW on PC by Modbus RTU.
The only way to get no error is the way to configure the TRB als Modbus Serial server.

Sending a value to the register 1025 works.

The value is stored in the regfile

But now I what that a sms is send via the alarm configuration under Modbus serial client

But nothing happend.
Sending SMS manually works.

What are my faults

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