UPS25 13
RTD Embedded Technologies, Inc
Base address jumper (Factory setting: 300h)
The UPS25 is I/O mapped into the memory space of your host computer. The
board occupies a consecutive memory window of 2 bytes starting from the base
address.
The most common cause of failure when you are first setting up your
module is address contention. Some of your computers I/O space is already
occupied by other devices and memory resident programs. When the UPS25
attempts to use it's own reserved memory addresses (which are being already
used by another peripheral device) erratic performance may occur and the data
read from the board may be corrupted.
To avoid this problem make sure you set up the base address by using the three
jumpers marked “J14”, this allows you to choose from a number of different
addresses in your host computer’s I/O map. Should the factory-installed setting of
300h be incompatible to your system configuration, you may change this setting
to another using the options illustrated in Table 2-2 (overleaf). The table shows
the jumper settings and their corresponding values in hexadecimal form. Ensure
that you verify the correct location of the base address jumpers. When the
jumper is removed it corresponds to a logical "0", connecting the jumper to a "1".
When you set the base address of the module, record the setting inside the back
cover of this manual.
