Galaxy: How do I perform loopback testing on a Galaxy display using Gen 2 serial radio system?

Topic

  • How do I run a loopback test at different points on a Generation 2 serial radio setup?
  • How to test serial radios.

Environment

  • Product: Galaxy
  • Components: Gen 2 and Gen 3 Serial Radios
  • Control System: Venus 1500, Radio Config Utility, M2Config

Steps

  • Follow the instructions below to perform loopback testing.

Note:  Prior to starting the loopback test we can run Radio Config Utility in an attempt to poll the server and client radios

Step 1: Locate proper software that can perform needed functions for loopback testing.

Step 2: Start loopback testing. There are different areas that the test can be ran on to help isolate where the communication failure is located.

Step 3: If loopback passes at test points, remove the loopback and test for it to fail.

  • After each test point it is important to reconnect everything before moving to next test point.
  • If at any point the loopback test fails, please contact Daktronics Technical Support at 1-888-325-7446.

Step 4: Do loopback test on com port of the computer, serial cable or on the USB to serial adapter by jumping pins 2 & 3 on the 9pin male or female end. Refer to the image below.

  • A small flat blade screwdriver can be used to jump the pins on the male end of the serial cable.

dd2127080_1_serial_loopback[1].jpg 

Step 5: Do a loopback test on the signal converter (Radio TX Interface J-Box). Remove wires on TX-p, RX-P, TX-N and RX-N and jumper pins TX-P and RX-P together and TX-N and RX-N together. Refer to the image below.

   DD2032686_2[1][1].jpg            

Jbox and Server radio image:

Step 6: Do a loopback test on the cable coming into the server radio by disconnecting and twisting together TX-P and RX-P, as well as TX-N and RX-N wires.

  • Color of cable may vary. It is important to note the pinout prior to removing cable from TB2.
  • The cable color in the image below is recommended Daktronics installation as per: Serial Communication Radio Manual, ED-13932.
  • Red wire below is ground, Green wire below is power
DD2032686_3[1][1].jpg
 
Step 7: Do a loopback test through the server radio testing the signal output.
  • Power the display down before performing this loopback test.  Having the client radio powered up may affect testing conditions as it will continue to transmit/receive signal.
  • Note: While powering off the display/client radio may be needed, move forward with the loopback test on the server radio output at TB1. If the loopback fails, power off the display and run the test again.
  • Connect RX to TX(pins 5 and 6) on TB1 signal out.
    • This socket will be empty.

                                                                           

Capture[1][1].png 

Step 8: Do a loopback at client radio. Remove wires from TB1, RX (pin5) and TX (pin6), place jumper into TB1 RX (pin 5) to TX (pin 6) on the radio. Refer to the image below.

  • Note: Color of cable may vary. It is important to note the pinout prior to removing cable from TB1.

client TB1.png

Step 9: If loopback testing passes out of the client radio loopback test at the controller

KB ID: 000004964


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