Black Box IC171C manual RS422/485 Serial Interface Plus

RS422/485 SERIAL INTERFACE PLUS

The RS422/485 Serial Interface Plus is setup to use the AT interrupts, but there’s no interrupt response.

How to identify the problem: Verify that the interrupt jumpers are correctly set. Verify that the card is inserted into a 16-bit or AT slot.

Solution: Use the program SLT (found on your utility diskette) to verify that the interrupts are set correctly. (Note that SLT requires that the transmit and receive signals on the connector be “looped back” or connected together.

This can be accomplished by setting SW2 4 and 5 ON.)

Reason: AT IRQs are not found on the 8-bit slots only on 16-bit slots. The higher level interrupts can never be used in a PC/XT compatible system or if the board is installed in an 8-bit slot.

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