Axxon LF755KB Manual de instalação - Página 16

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

FIFOs

This page is used to configure the FIFO trigger levels, i.e. at what fill levels the device will generate an interrupt, or

apply automatic flow control. In addition, the FIFOs can be completely disabled; although this is not recommended

for normal operation.

The four sliders allow adjustment of the various trigger levels in 550 and 950 modes. These are described below:

•

Transmitter FIFO interrupt trigger level - When the level of data in the transmit FIFO falls below this

value, a transmitter interrupt is triggered. Setting this value to zero will not trigger an interrupt until the

transmitter is completely idle.

•

Receiver FIFO interrupts trigger level - When the level of data in the receiver FIFO reaches this value, a

receiver data interrupt is triggered.

•

Flow On flow-control limit - When the level of data in the receiver FIFO reaches this value as data is read

from the FIFO, a handshake is triggered to instruct the remote transmitter that it is free to transmit data

(E.g. Transmit an XON character to the remote machine).

•

Flow Off flow-control limit - When the level of data in the receiver FIFO reaches this value as it fills up, a

handshake is triggered to instruct the remote transmitter to stop sending data as the FIFO is becoming full.

(E.g. Transmit an XOFF character to the remote machine).

The FIFO trigger levels can be fine-tuned to gain optimum performance, depending on system performance, baud

rate used, levels of serial traffic etc.

5.1.2 Linux configuration

This adapter card design uses four (4) UART controllers with the following PCI IDs for a PnP enumeration under

Linux:

Vendor ID: 1415h

Device ID: 950Bh

Therefore, by design, this adapter card will be PnP enumerated and supported as an 4 channel RS422 adapter

card without add-on drivers, without kernel recompiles, without add-on modules.

By design, this adapter is PnP compatible with 2.4 and 2.6 kernels. In some cases, you will be required to expand

the # of serial ports to be larger than the default value of 4. The Grub loader may be used to expand this value at

boot time. Please contact Axxon technical support for assistance if the adapter card is not PnP supported for your

Linux distribution.

5.1.3 Apple configuration

By design, this adapter card is PnP supported on Apple MAC OS 9 and higher without the requirement of a device

driver. Simply power down your system -> remove the AC power cable to confirm that the power supply is

removed. Wait 30-60 seconds. Remove the computer case side panels on your chassis. Install our adapter card

into a free PCI Express expansion slot.

DO NOT confuse PCI Express (PCIe) with PCI. This adapter is NOT compatible with PCI slots.

DO NOT confuse PCI Express (PCIe) with PCI-X. This adapter is NOT compatible with PCI-X slots.

This design is compatible with x1, x2, x4, x8 and x16 lane PCI Express expansion slots.

Damage to the motherboard and/or this adapter can occur if the circuit board is forced to fit into a PCI or PCI-X

expansion slot. Such damage is not covered under warranty through Axxon. With the provided mounting brackets,

it is not possible to seat this circuit board into such a wrong expansion slot. Do not attempt to remove this

mounting bracket to force a fit into an expansion slot. If there is any doubt on the expansion slot to be deployed for

your installation, please contact us for assistance. A suggestion is to forward to our support staff details of your

computer system with make + model and if possible, a digital photo to clarify the chassis and slots.

Axxon Computer Corporation

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