Lib.rs

Rodbus-client is a command line application that uses the Rodbus crate to send Modbus requests and print responses to the console.

> cargo install rodbus-client

Use the -h option to specify the host to connect to and the -i option to specify the Modbus unit ID.

Each request can be sent using the following subcommands:

• rc: read coils
  • -s: starting address
  • -q: quantity of coils
• rdi: read discrete inputs
  • -s: starting address
  • -q: quantity of discrete inputs
• rhr: read holding registers
  • -s: starting address
  • -q: quantity of holding registers
• rir: read input registers
  • -s: starting address
  • -q: quantity of input registers
• wsc: write single coil
  • -i: index of the coil
  • -v: value of the coil (true or false)
• wsr: write single register
  • -i: index of the register
  • -v: value of the register
• wmc: write multiple coils
  • -s: starting address
  • -v: values of the coils (e.g. 10100011)
• wmr: write multiple registers
  • -s: starting address
  • -v: values of the registers as a comma delimited list (e.g. 1,4,7)

Examples:

• Read coils 10 to 19 on localhost, port 502, unit ID 0x02: cargo run -p rodbus-client -- -h 127.0.0.1:502 -i 2 rc -s 10 -q 10
• Read holding registers 10 to 19: cargo run -p rodbus-client -- rhr -s 10 -q 10
• Write coil 10: cargo run -p rodbus-client -- wsc -i 10 -v true
• Write multiple coils: cargo run -p rodbus-client -- wmc -s 10 -v 101001
• Write register 10: cargo run -p rodbus-client -- wsr -i 10 -v 76
• Write 42 to registers 10, 11 and 12: cargo run -p rodbus-client -- wmr -s 10 -v 42,42,42

It is also possible to send periodic requests with the -p argument. For example, to send a read coils request every 2 seconds, you would do this: cargo run -p rodbus-client -- -p 2000 rc -s 10 -q 10