Interface error

In the ‹Status› window under the ‹Diagnostic› menu there is a facility to look at the messages that have occurred due to an interface error. The source for the errors can be decoded from the following status messages.

·         $02 – buffer overflow.

·         $08 – longitudinal parity error.

·         $10 – framing error.

·         $20 – overrun error.

·         $40 – vertical parity error.

·         $80 – interface error (always set when an error has occurred).

For the PCL45USB hardware interface, normal pc testing techniques should be used to confirm the correct operation of the particular USB port.

With the PCL45 hardware interface, in case an interface error does occur some simple checks can be carried out:

·         Ensure the correct COM port has been selected.

·         Check the connections at both ends of PCL45.

·         Check the COM port has the capability to drive +/- 8V @ 3mA.