Building security video subsystem with the use of Stratch VRC7008L video capture card one can install Sensor-Relay cards in order to connect external sensors and executive devices (relays) to the Server.

Connect the Sensor-Relay card as follows:

1. If sensors need power supply (active sensors), then set the SW1 jumper to 2 and 3 contacts, otherwise – to 1 and 2 contacts (passive sensors).

   The SW2 switch is used for the RS485 interface configuration. If two Sensor-Relay cards are in use, then the RS485 interface is disabled on the second card.

2. Make sure that the power of computer is off.

3. Connect the Sensor-Relay card to the vodeo capture card with the help of a loop bundled with the distribution kit. The loop is connected to the J1 and J2 connectors.
   

4. If it is necessary connect one more Sensor-Relay card. Connect the loop to the J3 connector on the first and to the J2 connector on the second Sensor-Relay card.
5. Install the Sensor-Relay card into a vacant motherboard slot and fix it in the casing.
6. Connect sensors and relays in accordance with the pinout of external pin of the Sensor-Relay card.

The Sensor-Relay is now connected.