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README.md
nymea-modbus-cli
The nymea-modbus-cli tools is a command line tool for testing modbus TCP/RTU communication.
The tool allows to read or write registers in a generic way.
Following options are available:
Usage: nymea-modbus-cli [options]
Tool for testing and reading Modbus TCP or RTU registers.
Copyright © 2016 - 2023 nymea GmbH <contact@nymea.io>
TCP
-----------------------------------------
Example reading 2 holding registers from address 1000:
nymea-modbus-cli -a 192.168.0.10 -p 502 -r 1000 -l 2
RTU
-----------------------------------------
Typical baudrates:
- 1200
- 2400
- 4800
- 9600
- 19200
- 38400
- 57600
- 115200
Example reading 2 holding registers from address 1000:
nymea-modbus-cli --serial /dev/ttyUSB0 --baudrate 9600 -r 1000 -l 2
Options:
-h, --help Displays help on commandline
options.
--help-all Displays help including Qt
specific options.
-v, --version Displays version information.
-a, --address <address> TCP: The IP address of the
modbus TCP server.
-p, --port <port> TCP: The port of the modbus TCP
server. Default is 502.
--serial <port> RTU: The serial port to use for
the RTU communication.
--baudrate <baudrate> RTU: The baudrate for the RTU
communication. Default is 19200.
--parity <parity> RTU: The parity for the RTU
communication. Allowed values
are [none, even, odd, space,
mark]. Default is none.
--databits <databits> RTU: The amount of data bits
for the RTU communication.
Allowed values are [5, 6, 7, 8].
Default is 8.
--stopbits <stopbits> RTU: The amount of stop bits
for the RTU communication.
Allowed values are [1, 1.5, 2].
Default is 1.
--list-serials List the available serial ports
on this host.
-m, --modbus-address <id> The modbus server address on
the bus (slave ID). Default is
1.
-t, --type <input, holding, discrete, coils> The type of the modbus
register. Default is holding.
-r, --register <register> The number of the modbus
register.
-l, --length <length> The number of registers to
read. Default is 1.
-w, --write <data> The data to be written to the
given register.
-d, --debug Print more information.