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6.If the card is working properly, the characters will appear on the
screen. If the characters do not appear, the card is not necessarily
defective. Examine the following possibilities (refer to
• Check the port settings in your software and on DIP switch S1. Are S1
and your software set to use the same address?
• Check the setting of jumper E1. If S1 is set to COM1:, is E1 set to
IRQ4? If S1 is set to COM2:, is E1 set to IRQ3?
• Is there a conflict between the port-address setting or interrupt
setting of the PC
No two cards in the same computer can use the same port address or
interrupt.
• Is the card's connector actually jumpered as shown in Figure 4-1?
If you eliminate any of these potential problems and the card still fails
its self-test, it is probably faulty. See the next section.
4.2 Serial Utility Diskettes
Two serial utility diskettes are supplied with the PC
Interface and will be used to eliminate common problems you may
encounter.
1. Identify all I/O adapters currently installed in your system. This
includes your onboard serial ports, controller cards, and sound cards.
The I/O addresses used by these adapters, as well as the IRQ (if any),
should be identified.
2. Configure your PC
with currently installed adapters. No two adapters can occupy the same
I/O address.
3. Make sure the Serial Interface is using a unique IRQ. While the
Interface does allow the sharing of IRQs, many other adapters do not.
The IRQ is typically selected via an onboard header block.
4. Make sure the PC
motherboard slot.
5. Use the supplied diskettes and this manual to verify that the
PC
422/485 Serial Interface is configured correctly. One of the
↔
supplied diskette contains a diagnostic program, SSD, that will verify if
an adapter is configured properly. Refer to the README.txt file on the
disk for detailed instructions on using SSD.
422/485 Serial Interface and that of another card?
↔
422/485 Serial Interface so that there is no conflict
↔
422/485 Serial Interface is securely installed in a
↔
CHAPTER 4: Troubleshooting
Chapter 3
422/485 Serial
↔
):
15
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