Communication failures typically fall in to 2 categories:

  1. bad interconnecting wiring
  2. board faults

If you’re not using Belden 8162 or 8163, you run the risk of causing a communications problem that gets worse with time.

The CRU talks RS232 which then routes to a converter (RS232 to RS422) before the signal leaves the CRU. The transceiver receives the RS422 directly without a converter.

Here is the order of typical failures:

  1. RS232/RS422 converter in the CRU
  2. IO Plexor
  3. CPU board in the CRU

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