PXL-500 RS-485 Network Wiring Test

PXL-500 RS-485 Network Wiring Test

1.0 Introduction

The RS-485 wiring test is provided for field testing of the RS-485 connection. The RS-485 wiring test is done in two steps. The first step tests the negative side of the RS-485 (TB-1 pin 1 and the second step tests the positive side of the RS-485 (TB-1 pin 2).

 

Make sure the RS-485 cable drain wire is connected to pin 3 on TB-1 on each controller in the network.

 

NOTE: The RS-485 wiring test will show if there are any PXL-250s that still have the R45 resistor. This resistor must be removed for the RS-485 wiring test to work properly. For information on how to test a specific controller and remove the R45 (2.2K) resistor, refer to the R45 (2.2K) Resistor Removal Application Note (P/N 01736-001).

 

 2.0 RS-485 Negative Test

  1. Make sure all controllers are powered up.
  2. Install the jumper across pins 1-2 on JP9 on the Primary controller ONLY.
  3. LED11 will illuminate RED continuously (it is ok for the green LED to be either off or flashing).
  4. Check each Secondary unit on the system. The following guide will inform you of that controller’s status.

 

• If LED11 is illuminated RED on every controller in the network, then the RS-485 negative wiring is ok.

• If LED12 is illuminated Green, then the + and - lines are reversed somewhere in the RS-485 wiring or at the

controller.

• If no LED is illuminated, then there is an open wire somewhere in the RS-485 wiring, at the controller, or the drain

wire.

• If both LEDs are illuminated on all controllers, then there is either a short in the wiring somewhere in the RS-485

wiring or at the controller, or there is one or more PXL-250s that still have the R45 resistor.

 

3.0 RS-485 Positive Test

1. Once all controllers on the network have been checked and are operating correctly, return to the Primary controller.

2. Switch the jumper on JP9 from pins 1-2 to 2-3 on the Primary controller ONLY.

3. LED12 will illuminate GREEN continuously (it is ok for the red LED to be either off or flashing).

4. Check each Secondary unit on the system. The following guide will inform you of that controller’s status

• If LED12 is illuminated GREEN on every controller in the network, then the RS-485 positive wiring is ok.

• If LED11 is illuminated RED, then the + and - lines are reversed somewhere in the RS-485 wiring or at the controller.

• If no LED is illuminated, then there is an open wire somewhere in the RS-485 wiring, at the controller, or the drain

wire.

• If both LEDs are illuminated on all controllers, then there is either a short in the wiring somewhere in the RS-485

wiring or at the controller, or there is one or more PXL-250s that still have the R45 resistor.

Once all controllers on the network have been checked and are operating correctly, return to the Primary controller.

5. Remove the jumper from JP9 (be sure to keep the jumper in a place where it may be used in future tests).

6. Either perform a reset on the Primary controller, or perform an Autoconfig in Doors.NET The test is complete and the system is in operating order.


Note: LEDs 11 and 12 blinking when not in RS-485 wiring test mode is normal.




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