Tripp Lite USA-49WG Windows Owner's Manual for USA-49WG 4-Port USB Serial Adap - Page 3

2.1 - Capabilities The Keyspan USB 4-Port Serial Adapter provides FOUR male DB9 serial ports which support RS-232 asynchronous communications at data rates up to 230 Kbps. Keyspan USB 4-Port Serial Adapter Ports The four DB9 ports on the Keyspan Adapter are seen as COM ports by Windows. The Keyspan COM ports are interfaced via the "Win32 Communications API" and are then available to any program that accesses COM ports via this API. By default, the COM port numbers assigned to the Keyspan adapter are the first unassigned (available) COM port numbers in the Windows registry. For example, if COM1 and COM2 have already been assigned or set aside by any software or hardware, the Keyspan adapter will take the next available COM port number (COM3). On Keyspan adapters that have multiple serial ports, the Keyspan software will assign a COM port number to each serial port on the Keyspan adapter. In the above example, the Keyspan adapter will get COM3 for the 1st serial port, try to assign COM4 to 2nd serial port, etc. It is possible to have an adapter with COM3, COM8, COM9, and COM10. The COM port number(s) of your Keyspan serial port(s) can be accessed via your serial device's software (Palm's HotSync Manager, Wacom tablet control panel, etc.). Note: You can connect more than one Keyspan USB 4_Port Serial Adapter to your USB equipped Windows computer. The DB9 ports on subsequent adapters will have a different COM port number. 3