Moxa Technologies PCI Express Board User Manual page 62

PCI Express Boards
7. Select an Rx FIFO Trigger from the Rx FIFO Level drop-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.
8. Select a Tx FIFO Level from the Tx FIFO Level drop-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.
9. If you use the CP-118EL-A, CP-114EL, CP-114EL-I, CP-132EL, CP-132EL-I, select Interface (RS-232,
RS-422, RS-485-2W, or RS-485-4W) and Termination Resistor (120Ω, Enable, or Disable) to configure.
We use the CP-114EL to illustrate. The following figure shows the settings for configuring the port for
RS-422 and no Termination Resistor (select Disable).
10. Click OK to save the port settings, and then click OK in the Property window to finish the port settings
procedure.
Tx FIFO Rx FIFO
High 128 120
Middle 64 60
Low 1 1
Unit: Bytes
3-46
Software Installation