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MODBUS CONFIGURATION
The Modbus board supplied with the UF3300 complies with the
Modbus Application Protocol Specification V1.1b3 and Modbus
over Serial Line Specification and Implementation V1.02. Copies of
these documents can be found at
https://modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf
and
https://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
respectively.
Only the mandatory RTU mode is supported for the UF3300.
The Modbus specification for RTU-mode defines an 11-bit character
frame containing an 8-bit character. If Parity is used, then only one stop
bit is required. If parity is not used, then two stop bits must be specified.
In addition to the standard frame format, non-standard 10-bit frames
are also supported. In this case the UF3300 will issue warnings but not
prohibit the use of these formats.
The board supports the following baud-rate and parity combinations:
Baud Rate
300
600
1200
2400
3600
4800
Issue 1.1 March 2022
Data Bits
Parity
8
E, O, N
8
E, O, N
8
E, O, N
8
E, O, N
8
E, O, N
8
E, O, N
Stop Bits
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
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