User`s manual

PCI Express Board User's Manual Driver Installation: Windows Vista/2008
3-22
4. Select a COM number for the port from the Port Number pull-down list.
5. Select the Auto Enumerating COM Number option to map subsequent ports automatically. The port
numbers will be assigned in sequence. For example, if COM 3 is assigned to Port 1, then COM 4 (if not
already occupied) will be assigned to Port 2, etc.
6. Select an Rx FIFO Trigger from the Rx FIFO Level pull-down list. Rx FIFO trigger levels of High, Middle,
and Low are available, with the default set to High (120 bytes). Select Set the change to all ports option
to apply this Rx FIFO Trigger to all ports.
7. Select a Tx FIFO Level from the Tx FIFO Level pull-down list. Tx FIFO Levels of High, Middle, and Low
are available, with the default set to High (128 bytes). Select Set the change to all ports option to apply
the just defined Tx FIFO Size to all ports.
Tx FIFO
Rx FIFO
High
128
120
Middle
64
60
Low
1
1
Unit: Bytes
8. If you use the CP-114EL, CP-114EL-I, CP-132EL, CP-132EL-I, CP-118EL-A, select Interface (RS-232,
RS-422, 2-wire RS-485, 4-wire RS-485) and Termination Resistor (120Ω, Enable or Disable) to configure.
Take CP-114EL for example. If you would like to configure as RS-422 and no Termination Resistor, please
see figures below.