Axxon LF755KB Посібник з монтажу - Сторінка 10

Переглянути онлайн або завантажити pdf Посібник з монтажу для PCI карта Axxon LF755KB. Axxon LF755KB 19 сторінок.

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

V1.0

Typical Ports Environment for a 4 Port PCIe SMPTE Installation with Oxford Device Drivers (example only)

COM5 : P1, COM6 : P2, COM7 : P3, COM8 : P4

Timing Background

The serial ports found on the IBM personal computer have historical evolved around a clock source of 1.8432 MHZ

(industry standard). The Axxon MAP/950 PCI series is shipped by default with a 1.8432 MHZ clock source

(CLK/8). Such a clock source permits a logical 1:1 mapping of desired baud rate to a target serial port device.

Using the 16c95x UART internal clock multiplier(s) and pre-scalars in the provided device drivers, you may select

up to 460K-baud rate communication speed between the host PC and a serial port device (provided the target

device supports up to 460K-baud operation).

Select the DETECT CRYSTAL button in the device drivers to allow for the proper application requested baud rate

to hardware baud rate relationship. Select the QUAD BAUD RATE (option) to activate the X4 baud rates. When

active, this X4 option will map the application selected baud rate to target hardware baud rate by a ratio of X4. As

an example, when this option is SELECTED, 300 Baud in the Windows application will map to and run the serial

port at an actual value of 1200 Baud.

Crystal Detection for Input Clock

This configuration is required to allow the device driver to correctly calculate the Input Clock being fed into the

onboard UARTS. In most applications, this value will auto-detect to 1.8432 MHZ, which permits a 1:1 mapping

ratio relationship for Application Selected baud rate to Target Hardware baud rate.

Axxon Computer Corporation