Taiwan Commate Computer Inc. PV-DDR User Manual page 12

2.4.2 Infrared Connector (5-pin JIR)
This connector supports the optional wireless transmitting and receiving
infrared module, with this module and application software such as Laplink or
Win95 Direct Cable Connection, user can transfer files to or from their laptops,
notebooks, PDA, PCs and printers. The connector supports IrDA (115.2Kbps, 2
meters) and ASK-IR (56Kbps). An optional consumer infrared (CIR) set
connects to the CIR and SIR connectors simultaneously for both wireless
transmitting and remote control functions through one external infrared
module. Install infrared module onto Infrared connector and configure the
setting through "UART Mode Select" in Integrated Peripherals to select
whether UART is directed for use with COM2 or Infrared.
2.4.3 System & CPU Fan Connectors (3-pin FAN)
Connect the fan's plug to the board taking into consideration the polarity of the
connector.