Measurement Computing CIO-DO24DD - Manual (Page 6)

2.0 SOFTWARE INSTALLATION
On the disk labeled InstaCal there is an installation program. Please run this program
and accept the defaults. Refer to th e Extended Software Installation Manual for
complete instructions. If you have purchased the Universal L ibrary for programming
language support, use that disk to install both InstaCal and the Universal Library.
InstaCal will guide you through switch and jumper settings you may need to make
before installing y our board. Detailed information on hardware settings is also
provided below.
3.0 HARDWARE INSTALLATION
3.1 BASE ADDRESS
The boards are setup at the factory with the base address set to 300h (768 decimal). If
there are no other devices installed in your computer that are using addresses 300h
through 304h (or 308h if using the CIO-DO48DD), do not change the base address.
The CIO-DO24DD employs the PC bus for power, communications and data transfer.
As such it draws power from the PC, monitors the address lines and control signals
and responds to it’s I/O address, and places data on the eight data lines.
The BASE address is the only user selectable bu s related feature of the
CIO-DO24DD. The base address identifies the registers that software writes to when
communicating with the CIO-DO24DD.
A block of eight (or seven) DIP switches are used for setting the base address. Each
switch position corresponds to one of the PC bus address lines. Placing a switch down
asserts that address bit.
A complete address is constructed by calculating the HEX or decimal number which
corresponds to all the address bits the board has been instructed to respond to. For
example, in Figure 3-1, (for CIO-DO24DD) address switches 9 and 8 for are DOWN,
all others UP. See Figure 3-2 for the address select switches for the CIO-DO48DD.
Address 9 = 200h (512D) and address 8 = 100h (256 decimal), when added together
they equal 300h (768 decimal).
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