Slave ignores writes to addresses other than 0

ClassicDIY / ModbusTool

A modbus master and slave test tool with import and export functionality, supports TCP, UDP and RTU.

Apache License 2.0

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Slave ignores writes to addresses other than 0 #7

Closed DennisKuypers closed 6 years ago

DennisKuypers commented 6 years ago

Writes are denied, slave says:

Received address is not within viewable range, Received address: 1

See https://github.com/graham22/ModbusTool/blob/master/ModbusSlave/SlaveForm.cs#L340 Checks are always denied, because it's using https://github.com/graham22/ModbusTool/blob/master/CommonControls/BaseForm.cs#L20 which is always 0

ThomasvLingen commented 6 years ago

Can confirm this is a problem, I've reproduced it with the following steps (TCP mode):

Performing a "Write Single Coil" call to address 0x0000 succeeds
Performing a "Write Single Coil" call to address 0x0001 fails

Something I want to point out: The value is never written in the simulated slave, but this is in no way signaled back to the Modbus Client. The response sent back is just a normal response, which implies the write has succeeded.