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MODBUS/TCP 'Return Query Data' Function Code Detection

Info

Synopsis

The MODBUS/TCP client has sent a MODBUS server a Return Query Data request.

Description

The MODBUS/TCP client has sent a MODBUS server a Return Query Data request. The Return Query Data request, function code 8 (0x08) and subfunction code 0 (0x00), will cause the target server to echo the request sent to it. This function is typically implemented only in serial devices.

Solution

N/A