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Windmill Modbus Driver

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New: Version 7 of Windmill and COMIML Modbus driver now available at special introductory prices of just £50! For Windows 7 64-bit and 32-bit, Vista, XP and earlier.

Modbus devices connect to the PC over a serial line using the Modbus protocol. Included in our Modbus package is not just a Modbus driver, but the Windmill programs to log data, chart data and control your Modbus device. You can also send data, in real-time, to other Windows software like Excel or Access.

The Modbus driver, called COMIML, supports any mix of digital and analogue inputs and outputs. These can be distributed across any set of Modbus slave devices. You can configure the slave device address and the parameter number (register number) for each channel individually.

The Modbus protocol defines two modes of transmission: ASCII and RTU (Remote Terminal Unit). The COMIML driver supports both modes. It handles devices connected to the RS232 COM port of the computer, as well as devices connected to an RS485 lead.

You enter all your Modbus communication settings with a program called ComDebug. ComDebug saves your settings in a file which is then used by the COMIML Modbus driver. To enable you to test whether Windmill will work with your device, you can download a free copy of ComDebug! You can also use ComDebug to troubleshoot your Modbus connection. To register for your copy fill in this form.

Register for Free Modbus Configuration and Troubleshooting Software

Our newsletter subscribers can download the Modbus ComDebug software for free.

Details of the Modbus protocol settings are both on our web site and in the ComDebug on-line Help. To install ComDebug...

1. Download the free ComDebug Modbus software.
2. Run setup.exe to install.
3. Run ComDebug
4. Enter the necessary settings, as detailed in the Modbus Settings page.

Ordering a Modbus Driver

You can buy the COMIML Modbus driver from our data acquisition catalogue. It is currently on special offer, reduced from £145 to £50. It comes with the Windmill suite of logging, charting and control applications plus free technical support for life and a money-back guarantee. See the converter below for the price in your currency.

Currency Converter

If you choose the buy the Modbus driver, your Credit Card Company will charge you in your local currency according to the exchange rate on that day. This currency converter is a guide to today's exchange rate, but note that the actual price charged by your Credit Card Company may be different to that shown.