modbus_cli

Simple modbus client based on Qt framework

Install requirements

apt install qt5-default libqt5serialbus5-dev

Build:

git clone https://github.com/lirik90/modbus_cli.git
cd modbus_cli
qmake
make -j2

Run

./modbus_cli -h

Options:

  -h, --help                  Displays help on commandline options.
  --help-all                  Displays help including Qt specific options.
  -a, --address <adr>         Device address. Default: 1
  -t, --type <type>           Register type. Default: 4 holding_register
  -r, --read                  Read from device.
  -w, --write <values>        Write to device. Values comma separated. Example: 1,2,3
  --rw, --readwrite <values>  Write and read device.
  -s, --start <start>         Start value address. Default: 0
  -c, --count <count>         Values read count. Default: 1
  --repeat <repeat>           Repeat command. -1 is infinity. Default: 0
  --timeout <timeout>         Modbus response timeout in milliseconds. Default: 1000
  --raw <raw>                 Write raw data (hex)
  --func <func>               Function code for raw request
  --func_hex <func_hex>       Function code for raw request (hex)

Example

Read two holding registers from MTCP

./modbus_cli -r -t 4 -a 1 -s 1103 -c 2 mtcp://10.10.2.106:502

Read two holding registers from RTU

./modbus_cli -r -t 4 -a 1 -s 0 -c 2 rtu:///dev/ttyUSB0?baudRate=9600

Send raw request

./modbus_cli --address 1 --func_hex 10 --raw 00020001020002 rtu:///dev/ttyS0?baudRate=9600

Write values 15,24,35 to multiple holding registers and use full RTU connection string

./modbus_cli -w 15,24,35 -t 4 -a 1 -s 0 rtu:///dev/ttyUSB0?baudRate=9600&dataBits=8&parity=2&stopBits=1&flowControl=0

RTU Connection parameters

dataBits

Can use values 5, 6, 7, or 8

parity

• 0 is NoParity
• 2 is EvenParity
• 3 is OddParity
• 4 is SpaceParity
• 5 is MarkParity

stopBits

• 1 is OneStop
• 2 is TwoStop
• 3 is OneAndHalfStop

flowControl

• 0 is NoFlowControl
• 1 is HardwareControl
• 2 is SoftwareControl

Posible register type values

• 1 or discrete
• 2 or coils
• 3 or input_register
• 4 or holding_register