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2.1 – Capabilies
The Keyspan USB 4-Port Serial Adapter provides FOUR male DB9 serial ports which support RS-232 asynchronous
communicaons 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 Communicaons 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 rst unassigned (available) COM port
numbers in the Windows registry. For example, if COM1 and COM2 have already been assigned or set aside by any
soware or hardware, the Keyspan adapter will take the next available COM port number (COM3).
On Keyspan adapters that have mulple serial ports, the Keyspan soware 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
1
st
serial port, try to assign COM4 to 2
nd
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 soware (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 dierent COM port number.