National Instruments PCI-8430 User Manual

WhydidmyUSBserialportsenumerate
backward?
Ifyouuseadual-bootsystem(WindowsXPandWindows2000),the
COMportsmayenumerateoutoforderafterswitchingoperating
systems.Thisisbecausethedevicefirmwareisdownloadedwhenthe
deviceisfirstpowered.Becausethefirmwareimagesforoperationunder
Windows2000andWindowsXParedifferent,andtheUSBbuspower
maynotbecycledduringareboot,itispossibletoruntheincorrect
firmwareforthecurrentoperatingsystem.Youcanfixthisby
disconnectingandreconnectingtheUSB-232orUSB-485fromtheUSB
portorhub(anddisconnectingpowerontheUSB-485/4)toforcethe
appropriatefirmwaretobedownloaded.

National Instruments PCI-8430 Specifications

General

Operating Temperature	0 °C to 55 °C
Data Bits	5, 6, 7, 8
Stop Bits	1, 1.5, 2
Interface Type	RS-232
Bus Interface	PCI
Data Rate	Up to 1 Mbit/s
Maximum Baud Rate	1 Mbit/s
Baud Rate	50 bps to 1 Mbps
Isolation Voltage	500 V
Parity	None, even, odd, mark, space
FIFO Buffer Size	128 bytes per port
Operating System Compatibility	Windows