# Test Point Control ## What is a switching system {% embed url="" %} Switching system is hardware that allows you to create connections between test equipment and the device under test. Switching systems are needed because the test equipment channel count is often limited therefore one test equipment channel is used for multiple DUT test points

Example of an application with a switching system

## Supported Switching System **FunTEST Switching System Plugin**\ The most commonly used switching system with FunTEST is MX2400 (). How to use this plugin can be found here [Broken mention](broken://pages/2eF40t6GwB3Pi3mWu23f)

## How to use the switching system within a test sequence To implement a switching system into your test sequence you need to follow these three steps: ### Master Routing This is to connect your test equipment to the backplane buses of MX2400 The easiest way to do this is to utilize the user interface of the plugin. Go to **admin>devices** and click on MX2400 Matrix. In the newly opened window click routing. The following screen should appear:

Here you can intuitively create your desired interconnection by simply clicking on the schematics. When you reach your desired state copy the equivalent command located under the schematic view. This command can be used in your test sequence to set the switching system in you desired state. This can be repeated for any other configuration you need. To use this command in a test sequence, enter the copied command to MX column at desired test step.

### MX card routing MX card routing follows the same logic as master routing. In this case, we're connecting cards with our test points to the back panel buses. To create the command we'll switch to the tab Test-points within the MX plugin.

By clicking on the bottom schematics we can create our desired connection the same way as for the master routing and copy the equivalent command to our test sequence:

### Test Point Control Now that we have successfully routed both MX and Master Cards to the buses we can start controlling test points to connect the device under test and the test equipment. To do that you can use * **set**\ Example:\ set:10:15\ Leave currently connected TPs and connect moreover TP10 to LOW and TP15 to HIGH. * **cset**\ Example:\ cset:10:15\ Disconnect all TPs and connect TP10 to LOW and TP15 to HIGH bus * **clr**\ Example:\ clr:10:15\ Disconnect TP10 from LOW and TP15 from HIGH bus. Any other connected TP is leaved untouched. {% hint style="info" %} You can address test points directly by their automatically assigned number from the screenshot above but it's highly recommended to use aliases for test points to make your test sequence easy to read and maintain. Learn more [Test Station Setting](/funtest-documentation/test-station/test-station-setting.md) {% endhint %}

Simple test sequence to measure voltage at two different test points

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