What is Multi-Drop when using OSDP readers?

What is Multi-Drop when using OSDP readers?

With older Wiegand credential readers, a controller input connection could support only one reader without issues. With OSDP readers, Multi-Drop lets you connect up to four (4) readers to a single OSDP-enabled port or controller.

How do I wire and configure an OSDP reader for Multi-Drop?

Wiring an OSDP reader is a little different compared to older Wiegand readers. This gets even more complicated when using OSDP's Multi-Drop function. With older Wiegand wiring, each reader is wired individually back to the controller, while OSDP readers let an installer daisy-chain multiple OSDP readers to the controller. The installer will also need to note the serial number on the Red Reader so you can confirm which reader is being configured.

NOTE: If Readers are connected in a star pattern, an installer must place the OSDP jumper for the reader port on the PDK Red Controller.

Below, we will outline how to connect multiple OSDP readers to a single controller port.

Daisy-Chain Connection:

1. Connect the wiring from the reader port on the Red controller to the first OSDP reader.
2. Add the first reader to the PDK system. 
   Select OSDP for the Protocol, then click the gear icon next to OSDP.
   Set the OSDP Address to a value other than the default of 0.
3. Connect the wiring for the second reader to the wiring connectors on the first OSDP reader.
4. Add the second reader to the PDK system. 
   Select OSDP for the Protocol, then click the gear icon next to OSDP.
   Set the OSDP Address to a value other than the previously added reader.
5. Repeat the process above for each additional reader (up to a maximum of four) to the previously installed reader, and add the readers to the PDK system.