![]() Similar to Step 2 we will be twisting wires on the cable that connects to TB1 of the surge card together. This test can be preformed at the communication box located at the display.Step 3: Setup the Loopback test on the field run (cable running from the building to the surge card) If test fails follow: Serial Communication, unable to connect, failed signal converter.Using a conductor (paper clip or copper wire) jump pins 2 (RX-P) to 4 (TX-P) and then jump pins 3 (RX-N) and 5 (TX-N).Note: Write down which wire colors were connected to each pin.Use the spare green plug in the signal converter if available. Wires going to the display should be removed at this time and set aside. This test can be performed on J4 or J5 (only one jack at a time).Step 2: Setup the Loopback Test on the Phoenix Terminal Blocks. Follow: No communication between computer and signal converter, Failed serial port, DD2006911.Follow: Galaxy, No serial communication, Prolific or Moxa adapter/port locked up, DD2112087.Depending on which one is found follow one of the articles below: If test passes - a loopback test would need to be run on the serial output of the computer or may require the serial adapter be replaced.If the test still passes there is an issue with the test and should be preformed again. Remove the loopback jumper and run the test. If test pass be sure to test for fail.Perform steps in: How to perform a loopback test on a RS232 system.This setup may or may not be using a USB to serial adapter. Step 1: Setup the Loopback Test on Serial cable at computer. How to perform a loopback test to test a serial communication system using Tera Term, With or without a Lantronix box (Windows Vista, Windows 7).How do I perform a loopback test using HyperTerminal to test a serial communication system? (Windows XP).If using Venus 1500 v4 software, loopback testing will have to be done using a terminal program.If using Venus 1500 v3 software to control the sign, follow Venus 1500: How do I perform a loopback test with v3 software?.Utilize one of the following Software/Utility methods to preform the loopback test:
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