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Modbus TCP packet structure
You can find more information on Modbus packet structure using this link.
The query packet consists of Transaction ID, Protocol, Length, Unit ID, Function Code and Function Parameters fields and the maximum size is 260 bytes.
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| Property | Description |
|---|---|
| disabled (yes | no; Default: yes) | To enables or disable Modbus functionality. |
hardware-port (list of string; Default: modbus) | Assign a port to the service. Use the default "modbus" port. |
| tcp-port (integer:0..4294967295; Default: 502) | Specify the TCP port that the device will use for Modbus TCP communication. |
| timeout (integer:0..1000; Default: 1000) | Specify the timeout value, in milliseconds. The Maximum allowed time , during which a Modbus request is sent, and the reply is to be received. If the time between the request and the reply is longer than the configured value, the "failure" is returned. |
| disable-security-rules (yes | no; Default: yes) | To enable or disable security-rule feature. |
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