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RS422/485 SERIAL INTERFACE PLUS
Computer does not recognize any COM ports, or the system is “dead”
or non-responsive.
How to identify the problem: Use the SSD.COM Program (found on your
utility diskette).
Solution: Identify all COM ports installed on you computer and address the
RS422/485 Serial Interface Plus at a different address from those already
present.
Reason: Only one device can occupy an address location. If more than one
device tries to share an address space, a conflict will occur, preventing either
device from working.
The RS422/485 Serial Interface Plus’s address is not recognized
by the system.
How to identify the problem: Use the SSD.COM Program (found on your
utility diskette).
Solution: Verify that the RS422/485 Serial Interface Plus addresses are
correctly set.
Reason: If the board is incorrectly addressed, your application will not
respond.
The RS422/485 Serial Interface Plus transmits but does not receive.
The other side appears to receive, but you do not receive any characters
in your application.
How to identify the problem: Verify that the IRQ is set properly on your
RS422/485 Serial Interface Plus and is correctly set in your application
program.
Solution: Change the IRQs so that they are correct.
Reason: Most DOS application programs are “interrupt-driven” on receive. If
the IRQ is not set on the card to match those required by your application, it
will not receive characters, because the interrupt for the first character cannot
be serviced.
7. Troubleshooting