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PCI Quad 422/485 Card Chapter 8 Windows NT 4.0 Installation.
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Advanced Port Settings.
When the
Advanced
button of Port Settings is selected the following dialogue
is displayed:
Settings available in this window are:
FIFO settings.
Receive Trigger Level - These settings allow the selection of a receiver FIFO
trigger setting. Selecting a low value will allow the interrupt to be serviced
quicker, which is good for slow machines. If you have a fast machine, setting a
high value will give you more time for multi-tasking operations.
Software Transmit Limit - These settings allow the selection of a transmitter
FIFO trigger setting. Selecting a low value will send fewer data-bytes per
interrupt, and this is recommended if you are communicating to a slower
machine. Selecting a high value will send more data-bytes per interrupt, and will
give more time for multi-tasking operations.
FIFO Off - turns the selected ports FIFO buffer on or off. It is strongly
recommended that the FIFO for all ports is left enabled.
485 Mode offers the options:
Half Duplex / Full Duplex(default) - are used in conjunction with the RS485
Multiplex Jumper Settings.
NOTE: These software settings must match the RS485 Multiplex Jumper
configuration, as described in the section "