Axxon LF755KB Kurulum Kılavuzu - Sayfa 15

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Installation Guide for Axxon LF755KB PCI Express (PCIe) 4 Port RS422 SMPTE I/O Card (Low/Standard Height Mounting)

5 USING THE SERIAL DRIVER

The serial drivers for Windows make use of a number of enhanced 95x UART features, and are highly

configurable. This section describes the configuration utilities, accessible through Device Manager, which can be

used to enable and configure the various features

The driver will install the correct number of serial ports and Windows will assign COM numbers to them (e.g.

COM5). You can then attach modems etc. to the ports and make use of them in the same fashion as any other

generic port. The serial driver has extra configuration options available over and above the standard 'settings' tab

supplied with the generic 16550 drivers. To adjust any of the UART parameters, follow these steps:

1. Click on Start / Settings / Control Panel

2. Double click "System" to bring up the system properties dialog box

3. Select the "Device Manager" tab of this dialog (with the "View devices by type" option selected

4. Now click on the [+] next to the "Ports (COM & LPT)" icon to show the list of installed COM ports

5. Double click on an PCI port to display the settings dialog for that port

The enhanced features are configurable through three dialog pages:

Settings

- Standard port settings found on normal COM port settings pages

Data Rate

- Advanced data rate selection options

FIFOs

- Device mode selection and FIFO trigger level settings

Settings

This page contains the standard Baud rate / Data bits / Parity / Stop bits and Flow control options found on most

COM port settings pages. These settings modify the default settings used by Windows. Most applications that use

COM ports will override these settings with their own comms parameters.

Data Rate

This page provides a list of common crystal values used with COM ports. Select "Detect crystal frequency" to

detect the input clock frequency to the UART. (This requires that the port be not currently in use by another

application).

The baud rate can optionally be adjusted according to the data rate required. To enable the advanced baud rate

configuration options, deselect the "Use default baud rate" box. In normal operation, the driver will generate the

desired baud rate from the crystal frequency. The quad speed option will multiply all application selected baud

rates by 4 by utilising the OX16C95x Times clock register (TCR). The driver can multiply this baud rate, or divide it

using the Clock Prescaler register (CPR).

The clock pre-divisor is used to divide the input clock prior to baud rate generation. This means a high-speed

crystal (E.g. 50MHz) can be pre-divided to generate standard baud rates (In this case 50 / 27.125 = 1.8433 MHz,

which will emulate a 1.8432 MHz crystal with less than 0.01% bit rate error). Alternatively, the pre-divisor could be

switched off to allow data rates up to 12.5Mbps to be generated.

Axxon Computer Corporation

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