Daktronics

FL-2000/4000: How to run loopback tests on displays with direct wire communication.

Potential Symptoms

  • FL/DF 2000 and FL/DF 4000 system  using direct wire communication
  • Loopback test with DM-100

Environment

  • Product: Gas Price or Petroleum Displays, FL-2000, FL-2100, FL-2109, FL-2300, FL-4000, DF-2000, DF-2009, DF-2100, DF-2109, DF-2300, DF-4000
  • Component: Fuelink Direct 2000 (FLD-2000)
  • Control System: DM-100 handheld (ED-13374 revision 5.4, 5.8)

Resolution

Tools Required:
  1. 2 paper clips or small conductors
  2. Small flathead screw driver (eyeglass or jeweler's size)
  3. Phillips head screw driver for opening j-boxes

Step 1: Set DM-100 in loopback mode.

  • DM-100 - ED-13374 (Rev 5.4 or higher). (This is displayed on the boot up of the handheld).
    1. Press MENU.
    2. Using the arrow buttons, scroll to DIAGNOSTICS and press Enter.
    3. Using the arrow buttons, scroll to PORT TESTS and press Enter.
    4. Using the arrow buttons, scroll down to CURRENT LOOP and press Enter. (If loopback is not already in place, DM-100 will tell you which pins to connect; these pins are only for testing the DB9 output on the DM-100 and on the RS232 Cable).

Step 2: Put loopback in place at the desired test point. Test points are listed below.

DM-100 and RS232 cable
  • To test the DB9 output on the DM-100, connect pins 6 & 8 and 5 & 9.
  • To test the DB9 RS232 cable, connect pins 6 & 8 and 5 & 9.
  • Verify the loop back test is passing on both. (DM-100 will display "Loop back pass"). (Indicates good DM-100 and RS232 cable). 
Note: Paper clips or another conductor can be inserted into the DB9 female port on the DM-100 or the DB9 RS232 cable to connect the pins.
 
Indoor surge card
  • To test the indoor surge card, first open up the indoor j-box.
  • Make note of the wiring going into the terminal block. (The wiring should match figure 2 below).
  • Remove the wiring from the terminal block.
  • Connect one conductor to pins 6 & 8.
  • Connect the second conductor to pins 5 & 9.
  • Verify the loop back test is passing. (DM-100 will display "Loop back pass"). (Indicates good j-box card).
  • Note - If loopback test passes, remove the loopback and test again to ensure test fails.

8-22-2014 2-41-11 PM.jpg
Wiring from store to surge card

  • Make note of the wiring going into the terminal block. (The wiring should match the diagram below).
  • Remove the wires going into TB1.
  • Twist the wires together for TX+ and RX+. Do the same for TX- and RX-.
  • Run the loopback from inside.
  • Verify the loop back test is passing. (DM-100 will display "Loop back pass"). (Indicates wiring from store to surge card is good).
  • Note - If loopback test passes, remove the loopback and test again to ensure test fails.

8-22-2014 3-13-22 PM.jpg


Surge card

  • Remove wires from TB2 if present or cable from J2. Make note of the wiring on TB2 if wires are present.
  • Connect one conductor to pins 2 & 4.
  • Connect the second conductor to pins 3 & 5.
  • Run the loopback from inside.
  • Verify the loop back test is passing. (DM-100 will display "Loop back pass"). (Indicates surge card is good).
  • Note - If loopback test passes, remove the loopback and test again to ensure test fails. 

8-22-2014 3-43-03 PM.jpg
 

KB ID: DD2059166

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