User manual

PCL-734 User Manual 16
A.1 Register Format
Programming the PCL-734 is extremely simple. Each output channel corresponds to
a bit in the card's registers. To turn on an output channel you write a ‘‘1” to the corre-
sponding bit.
The card requires four I/O register addresses. The address of each register is speci-
fied as an offset from the card's base address. For example, BASE+0 is the card's
base address and BASE+2 is the base address + two bytes. If the card's base
address is 300h, the register's address is 302h. See Chapter 2 for information on set-
ting the card's base address.
Register assignments are as follows:
Table A.1: Register Assignment
Address Write Read
BASE + 0 IDO bits 0-7 N/A
BASE + 1 IDO bits 8-15 N/A
BASE + 2 IDO bits 16-23 N/A
BASE + 3 IDO bits 24-31 N/A