Applies to: NOP-IC2

Summary

This article explains the purpose and configuration of hardware jumpers on the NOP-IC2 controller. These jumpers are used for power source selection, RS-485 bus termination, and reader voltage configuration.

Prerequisites

Before changing jumper settings:

• Power down the controller.
   
• Confirm the controller model and installation requirements.
   
• Confirm the power source being used.
   
• Confirm RS-485 devices are wired in a daisy-chain configuration.
   
• Confirm the controller is located at the end of the RS-485 bus.
   
• Confirm the required reader voltage.

NOP-IC2 Jumper Reference

Configuring NOP-IC2 Jumpers

To configure NOP-IC2 jumpers:

1. Power down the controller.
    
2. Identify the jumper to be configured.
   
   Verify the wiring layout and confirm whether the port is located at the end of the RS-485 bus. 
    
3. Place the jumper in the required position.
    
4. Confirm the jumper is fully seated.
    
5. Restore power to the controller.
    
6. Verify controller, reader, and downstream communication status.
    

7. If communication issues occur, confirm that termination is only enabled at the correct end points of the RS-485 chain. 
   
   Enable the termination jumper when: 
   The controller port is at the physical end of the RS-485 bus. 
   No additional downstream RS-485 devices continue past that point. 
   
   Leave the termination jumper OFF when: 
   The device is in the middle of the RS-485 chain. 
   Additional devices continue downstream from the same bus.

   IMPORTANT: Enabling termination on too many devices can cause RS-485 
   communication issues. Termination should generally be applied only at 
   the two physical ends of the RS-485 bus.