Skip to main content

How Do I Wire and Configure an OSDP Reader


This article will explain how to setup an OSDP reader using the default values the baud rate (9600), RS485 reader address 0.  This reader is connected to the reader port, not the RS485 port on the controller.


Wire OSDP Reader
  • Red - V0
  • Black - Ground
  • Tan - DAT/D0
  • Red/Green - CLK/D1
EP Controller


LP Controller (Note 1k-ohm Resistor)
Reader 1 _ RED.jpg


  • According to a Mercury document there is a need for1K-ohm resistors (
  • From document:
    • 2.4.2 Are there specific installation requirements when attaching Mercury panels to HID OSDP-enabled readers? Yes, a 1K-ohm pull down resistor should be added between the Mercury DAT/TR- and GND lines on S3 interface modules and LP controllers. The pull down resistor should be installed at the panel.
Configure the Reader in BluSKY
  1. Navigate to Readers. Main Menu-> Setup-> System Setup-> Readers
  2. Use the  icon in the lower left side to create a new Reader.

BluINFO Create OSPD Reader.jpg

  1. First, pick the Controller that will manage the Reader.
  2. Select the SIO Board the Reader is attached.
    • Note: In some situations the SIO Board and Controller will be the same.
  3. Enter a name for the Reader in the Name text field. 
    • Note: Using good names can make the process of servicing and debugging much easier.
  4. Select the Reader Channel that corresponds with the Reader port on the SIO Board or Controller.
    • Note: This is the number that corresponds with which connection is used on the board.
  5. Choose the Reader Configuration.
  6. Click in the Card Data Format Flags field to bring up list of applicable Format Flags.
  7. Choose the Reader Setting from the dropdown menu.
  8. Choose the Keypad Mode.
  9. Select the appropriate Led Drive Mode set to OSDP Device Interface
  10. OSDP Address - Select the channel the reader is configured for.  Most single OSDP Readers are 0.  You can purchase readers with different channel numbers, and there are reader configuration cards that will change the channel.  If you do not know your channel start with 0 and work your way up.  Note: WIth OSDP you can now "daisy-chain" 4 readers to a single reader port on the SIO board.
  11. Set the OSDP Baud Rate - 4 speed options 9600 (default) 19200, 38400, 115200
  12. Enable OSDP Secure Channel allows for secure communication from Controller to Reader
  13. Enable OSDP Tracing This should be set to "No" unless directed by BluB0X support.  This setting will add OSDP reader information to Mercury debug logs, which would also need to be manually configured by BluB0X Support.
  14. Click in the Default LED Mode field to bring up list of applicable modes.
  15. Confirm the entry with the saveBtn.png button or because of the nature of this operation we provide a SaveAndNew.png button to move onto the next entry quickly.



  • Was this article helpful?