The Single-Pole Single-Throw Topology

The single-pole single-throw (SPST) topology is composed of one-pole, one-throw relays. Refer to the NI Switches Help for more information about SPST relay forms.

Note  You can resize the Switch Device window to see more SPST relays.

Refer to the schematic below for an example of the NI PXI-2564 in the 16-SPST topology.

Make an SPST Connection

Click on an individual relay to make an SPST connection. The Switch SFP translates this click into the appropriate channel connection and makes the connect call to the driver. To connect ch2 to com2, for example, click on the relay. The pole connects ch2 to com2. To break a connection, simply click the connection. The Switch SFP makes the appropriate connect/disconnect calls to the driver.