Allows different communication options (baud rate, byte size, parity and stop bits) on the same serial bus.

Besides LSW/MSW, it allows big-endian/little-endian swapping on all scalar data types.

Support for least significant word (LSW) and most significant word (MSW).

Supports minimum channel silence, forcing a time between every request on the serial bus.

Supports automatic black list, avoiding requests for disconnected equipment.

Adjustable minimum request interval per register.

Adjustable polling request time per equipment.

Support for reading/writing data that spans multiple contiguous registers with different sizes and byte order (for example interpreting the value of four contiguous registers as a 64-bit Floating Point).

Supports equipment slave id full range (1-247).

Supports word and byte swapping (byte order):.

Supports adjustable address base (0 or 1).

Supports multiple equipment via IP addressing.

In addition, TCP/IP allows a very large number of concurrent connections, so in most cases, it is the choice of the initiator whether to reconnect as required or re-use a long-lived connection. A connection is easily recognized at the protocol level, and a single connection may carry multiple independent transactions. Programming operations, on the other hand, expect a connection-oriented approach. Modbus data transactions are traditionally stateless, making them highly resistant to disruption from noise and yet requiring minimal recovery information to be maintained at either end. The most common use of the protocols at this time is for Ethernet attachment of PLCs, I/O modules, and ‘gateways’ to other simple field buses or I/O networks. Specifically, it covers the use of Modbus messaging in an ‘Intranet’ or ‘Internet’ environment using the TCP/IP protocols. Modbus TCP is a variant of the Modbus family of vendor-neutral communication protocols intended for supervision and control of automation equipment.

Modbus rtu parser