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7 Proper Cabling in RS 485 and RS 422

6 Troubleshooting

1. The board is not found during or after installation

a) The card is not seated properly in the PCI slot. Re-install the card in the PCI slot.

2. Made wrong selection of “Cancel” during installation. When re-install the driver Windows

95/98/2000 doesn’t detect the card.

a) The driver installation is not complete. Install the card in another PCI slot to initialize

the installation again.

b) Alternatively you may try to run VSCLEAN to remove the falsely installed driver.

3. During installation, NT4.0 shows blue screen (white-text-on-blue-background)

a) In most cases, there is an IRQ conﬂict. The IRQ assigned to the board is in conﬂict with

other devices. The VScom PCI driver supports IRQ sharing. However, some devices

like network card or SCSI controller don’t share IRQ with other devices.

b) Be sure that your system has a free IRQ for the card. Enter “BIOS setup - PCI conﬁgu-

ration”, and set all IRQs to “PCI/ISA PnP” except for those non-PnP ISA components.

This will bring up the maximum number of free IRQs in the system.

c) Try to install the card to another PCI slot. To install the VScom PCI card to a diﬀerent

PCI slot will get a diﬀerent IRQ assignment. Or, you can exchange the PCI slot with

another card.

4. In the Event Viewer, error message shows “Another driver on the system, which did not

report its resources, has already claimed the interrupt used by LPTx”

a) Please refer to symptom (3) about the IRQ conﬂict problem, and the solution.

5. Using RS 485, the data transmission has errors

a) Please check your BIAS and Termination resistors. Termination reduces signal reﬂection.

BIAS helps in detecting the start of a new transmission.

b) Further check if the signal GND of transmitter and receiver are connected. RS 485 is

often referred to as “2-wire”, however connecting the GND is required. RS 485 deﬁnes

a so called “Common Voltage Range” of −7V to +12V. The only way to ensure this

parameter is by connecting pin 5 (GND) with the logic GND of the transmitter.

7 Proper Cabling in RS 485 and RS 422

This paragraph will provide a little bit of theory about RS 422 and RS 485 data transmission. It

is necessary to have this basic knowledge, to avoid or ﬁnd errors in data transmission. If you are

familiar with RS 485 and RS 422, do not skip this section, it covers common misunderstandings.

Failures in cabling are responsible for the vast majority of transmission problems.

July 2011 VScom Industrial Card User Manual 46

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Vision Systems VScom 200E PCIex Bedienungsanleitung Seite 46