Modbus Client
Windows 7/8/10/11
v2.38
This client is fully compliant with Modbus specifications, it allows to read and write registers through both Modbus RTU and TCP protocols. The main window contains the basic information to configure the protocol comunication. A USB-485 converter is required to query RTU slaves. Starting from version v2.38 the client implements the new standard Modbus Secure.
Read/write coils
Read and write functions of digital outputs.
Read inputs
Read functions of digital inputs.
Read/wire holding register
Read and write of analog outputs
Read input registers
Read of analog inputs
Supported functions:
FC01
Read Coil Status
Read digitali outputs
FC02
Read Input Status
Read digital inputs
FC03
Read Holding Register
Read input/output registers
FC04
Read Input Register
Read input registers
FC05
Force Single Coil
Write single output
FC06
Preset Single Register
Write single register
FC15
Force Multiple Coils
Write multiple outputs
FC16
Preset Multiple Registers
Write multiple registers
Diagnostic functions
In the diagnostics tab, diagnostic commands can be sent to the queried device, be aware that not all devices respond to the FC08 function:
FC08
Diagnostic
Supported diagnostic functions:
- 00 Return Query Data
- 01 Restart Comunications Option
- 02 Return Diagnostic Register
- 03 Change ASCII Input Delimeter
- 04 Force Listen Only Mode
- 10 Clear Counters and Diagnostic Register
- 11 Return Bus Message Count
- 12 Return Bus Comunication Error Count
- 13 Return Bus Exception Error Count
- 14 Return Slave Message Count
- 15 Return Slave No Response Count
- 16 Return Slave NAK Count
- 17 Return Slave Busy Count
- 20 Clear Overrun Counter and Flag
Modbus Secure
TLS v1.2 with x.509 certificate
Starting with version 2.38, support has been introduced for the ModBus Secure standard, according to the specifications described in the document MB-TCP-Security-v21_2018-07-24.