# Getting Connected

This is only a very brief explination on how to get your QCM200 connected, and assumes that you have already mounted the quartz crystal into your probe. Refer to the QCM200 manual for details, especially on how to mount the quartz crystal into the probe.

## PC Serial Communication Connection

| Plug the cable supplied with the instrument to a free serial (COM) port on your PC. The COM port will have 9 pins on it and will look something like the image on the left.

The two ports labeled 1 and 2 are serial ports. Note that simply unplugging a cable from a serial port does not necessary mean that port is now available. Any software application that was using that port must be closed.
Once you attach the serial cable to the PC, attach the other end of the cable to the QCM200.

## Macintosh Serial Communication Connection

The modern Mac does not come with a standard RS-232 port. A USB to serial adapter must be used to connect a Mac with a QCM200. SRS successfully tested an adapter made by IOGear (model number GUC-232A) with a Mac G5.

## Probe Connection to QCM25

| A BNC connector is used to make the electrical connection between the QCM25 probe controller and the probe itself. The B in the acyronym BNC stands for bayonet. The bayonet action of the connector means you must insert the probe's BNC connector fully into the QCM25 BNC receptacle, then twist the receptacle to lock the mating connectors.

## QCM25 Connection to the QCM200

| Plug the supplied RJ45 (ethernet type) cable into the QCM200 and into the QCM25 probe. You should hear a positive click as the RJ45 connector locks into both the QCM25 and into the QCM200.