 FIFO Interrupt Trigger Levels:
- Receive Buffer
- If you decrease this value, more interrupts are sent to the processor, slowing bytes into the UART. If you increase this value too high, characters may overrun the FIFO/buffer.
- Transmit Buffer
- The Transmit Buffer slider supports various values. For example, with our 16950 UART serial cards, it can be set between 0 and 127.
If you experience problems uploading files and you have it set high, decrease the value. The more you decrease it, the more interrupts are sent to the processor, slowing down the rate at which bytes are sent into the UART Transmit buffer, reducing serial overruns. The higher the number, the fewer interrupts are sent, increasing system performance during uploads.
- Some of our cards have an additional setting of "Receiver FIFO Flow Control Trigger Levels".
If the driver you are using has this option, the following explains how it works.
Receiver FIFO Flow Control Trigger Levels:
- The serial port will accept data until the Flow Off level is reached. It
will then begin accepting data again when the Flow On level is reached.
For example, if you have Flow On set at 64 and Flow Off set at 120 then
when the FIFO/buffer reaches 120 the serial port will stop receiving data
until the FIFO/buffer drops down to the Flow On point of 64.
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