2.2 COM Port Mapping and Board ID
The Board ID and COM port mapping are the same, which is set by the S1
DIP switch. The S1 DIP switch has different functions under different OS.
For
DOS
users, the S1 DIP switch acts as
Board ID
. When there are two or
more multi-port serial cards in a single system, it is difficult to identify individual
card number. For easier identification, the VXC series card includes a Board ID
function.
For
Windows
users, the S1 DIP switch acts as
COM port number selector
and the COM port number is depending on the Board ID. If the Board ID is 0,
then the driver finds a valid number for each port. If the Board ID is not 0, then
the driver uses the “
Board ID
” to be the first COM port number and uses the
“
Board ID +1
” to be the next COM port number and so on.
For
Linux
users, it’s the same as Windows users but for
TTY device
number selector
.
The configuration examples are as follows.
S1
Note:
It’s recommended to select a unique COM port number (Board
ID) by users. This helps users to identify and fix these cards and ports
in a system without confuses.
Note:
The port will not work if the COM port number is conflicted under
Windows or Linux system. In that case, users should try other COM port
numbers.
Usually, the COM1 and COM2 are reserved by systems. And it’s
recommended to reserve the COM3 and COM4 if you will have other
Plug&Play serial ports in the future. This prevents confliction.
ON
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VXC Cards User’s Manual (Ver. 1.1, 06/09.2005, pmh-012-01) -----11
