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wiki:rs-232_test_-_loopback_not_connected

When you have inserted the RS-232 plug first make sure that the RS-232 is functioning according to the specification, see: How to create a RS-232 loopback plug.

Then test the plug into you serial port on your computer or into a certified Tech2 USB-2-serial adapter. Download a serial terminal application like RealTerm to diagnose the loopback functionality.

Now plug your RJ-45 loop-back adapter into the Tech2 device and navigate to the RS-232 test. Depending on the software version there are various options to get to the RS-232 test menu.


While using the SAAB 44.000 software you need to follow this procedure;

  • Insert the loop-back plug into the RJ-45 port
  • Press PWR to turn on the Tech2
  • Title screen, press 'ENTER'
  • F2: Tools Options
  • F3: Field Services Diagnostics
  • F3: Selectable Main PCB
  • F2: RS-232 LoopBack

While using the SAAB 148.000 software you need to follow this procedure;

  • Insert the loop-back plug into the RJ-45 port
  • Press PWR to turn on the Tech2
  • Title screen, press 'ENTER'
  • F2: Tool Options
  • F0: Tech 2 Self Test
  • Press EXIT on the notification screen
  • F3: Selectable Main PCB
  • F2: RS-232 LoopBack

Now the Tech2 should respond with the following: RS-232 Test: Passed

If the Tech2 responds with RS-232 Test: LoopBack Not Connected or ADDRESS ERROR - PROCESSOR HALT the chances are high that the MAX202 or the MAX232 is borked, which means replacing the SMD RS-232 communications chip (SOIC type), noted as U202 on the main PCB.

wiki/rs-232_test_-_loopback_not_connected.txt · Last modified: 2016/11/14 13:25 by berry