Measurement Computing DataShuttle - Manual (Page 76)

8-6 Installing the ACAO 11-12-01 DataShuttle and DynaRes
ACAO Board Number Switch Settings
Board
Number
Switch Positions*
5 6 7 8
0 (disabled) D D D D
1 U D D D
2 D U D D
3 U U D D
4 D D U D
5 U D U D
6 D U U D
7 U U U D
8 D D D U
9 U D D U
10 D U D U
11 U U D U
12 D D U U
13 U D U U
14 D U U U
15 U U U U
* U = Up D = Down
Setting the Base Address
The Base Address determines the logical system address where the personal computer expects to find all
data acquisition boards. Base Addresses must be the same on all boards.
The factory setting for all of our ACAO boards is B00H (in hexadecimal format). If you also have analog
input boards installed in your system, note that that they use the 300H base address. The two underlined
digits must be the same for all installed boards: B00H for ACAO and 300H for analog input boards. (Please
refer to the individual boards’ owner’ s manuals for further instructions.)
It is rarely necessary, but if you have difficulty getting the board to work, you can change these switches to
values different from the factory settings. (Another device in your PC, for example, might be trying to use
the same Base Address.)
Indications of this are: if the program reports it cannot find your board, or if it reports fewer boards than
you really have, or if another board starts to work improperly after you install the ACAO.
These problems indicate interference with another board using the same base address as the ACAO product.
Remedy the problem by changing the switches of all ACAO boards to an address that has no conflict.
Setting ACAO Base Address
To Set the Base Address
1. Locate the Address Switches Remove the cover of your computer over the data acquisition board, and
find the location of the Base Address switches. Refer to the board illustration on page 8 – 2 in this chapter
and find “Base Address Switches” on the ACAO diagram.
On the printed circuit board itself, these are located within a block of eight DIP switches; switches 1
through 4 represent the base address.
(NOTE: Depending on the space available in your installation, it might be necessary to remove the board to
reach the Base Address Switches. If so, please follow the same precautions as in “Physical Installation” on
page 8 – 2 in this chapter.)