Advantech PCL-730, Руководство пользователя

Страница: 26 / 30

PCL-730 User Manual 18
A.1 Register Format
Programming the PCL-730 is extremely simple. Each I/O 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. To read an input port, you simply read from the register.
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 a 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.
Table A.1: Register Assignment
Address Write Read
BASE + 0 IDO bits 0-7 IDI bits 0-7
BASE + 1 IDO bits 8-15 IDI bits 8-15
BASE + 2 DO bits 0-7 DI bits 0-7
BASE + 3 DO bits 8-15 DI bits 8-15