Simply Modbus - Data Communication Test Software - Simply the easiest way to test and debug Modbus systems

Modbus tester for serial communication diagnostics

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Data Communication Test Software

Simply the easiest way to test and debug Modbus systems

RTU/ASCII Slave Emulator

Slave screenshot

No install program. Just download, unzip and run.

Free demonstration version with full functionality.
requires a program restart to send more than four replies to requests.

Features

· Functions as a Modbus RTU or Modbus ASCII Slave

· Monitors for requests from an RTU/ASCII Master devices
using Modicon 984 (5 digit addressing) protocol

· Settings are entered and displayed in one window with a 2nd window for the data.

· Displays the traffic on the serial port.

· Set the data types and byte and word ordering of the reply with a click

· Supported Function codes:

Function Code	Action	Table Name
01 (01 hex)	Read	Discrete Output Coils
05 (05 hex)	Write single	Discrete Output Coil
15 (0F hex)	Write multiple	Discrete Output Coils
02 (02 hex)	Read	Discrete Input Contacts
04 (04 hex)	Read	Analog Input Registers
03 (03 hex)	Read	Analog Output Holding Registers
06 (06 hex)	Write single	Analog Output Holding Register
16 (10 hex)	Write multiple	Analog Output Holding Registers

· 4 data blocks for registers.
· 2 data blocks for coils.

· each data blocks can have a different data type

· Supports Standard Modbus and Enron Modbus registers.

· Allows adding random noise to the data so each response is unique.

· Allows saving and restoring configuration settings to a csv file.

· Save the communication log to a text file.

and more...

Try the demo before you buy.

See the tutorial on How Modbus Works