Usb Interface - Relay PW250 User Manual

PW250

3.5 USB interface

The USB device port of the PW250 is as a USB 2.0 connector type B available on the front of the housing.
Please use a USB cable with a type A plug on one end and a type B plug on the other side (not supplied) to
connect a PC. You must install the software driver for the virtual COM port before you can use the USB
interface. This simulates a serial port that you can use as usual in your M-Bus software. You can find the
driver on our CD "Tools & Docs", on our homepage www.relay.de or directly from FTDI Chip, the manufacturer
of the used USB chip: http://www.ftdichip.com/Drivers/VCP.htm (here you will also find drivers for Linux and
Mac OS). Please start the unpacking with administrator privileges after download. To do this click on the
downloaded file in the File Explorer with the right mouse button and select the menu item "Run as
administrator" (example file name is: CDM v2.12.06 WHQL Certified.exe). The software will be first unpacked
and then installed.
Now you can connect the PC. The USB driver for the PW250 is installed automatically and generates a new,
virtual COM port. The new COM port number of the USB serial port is displayed after the installation is finished
(here: COM29). You can look up this number at any time in the Device Manager under ports (USB Serial Port)
and - if desired – change it in the advanced settings of the driver. Please select the appropriate comport
number in your M-Bus software.
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