1. Introduction
1.1 What is the I/O Expansion Bus?
The I-7188XA, I-7188XC, I-7188XB, I-7188XG, I-7188EX, I-
7188EG & 7521 all support I/O expansion buses. The I/O
expansion bus can be used to implement various I/O
functions such as D/I, D/O, A/D, D/A, Timer/Counter, UART,
flash memory, battery backup SRAM & other I/O functions.
Nearly all kinds of I/O functions can be implemented on this
bus.
1.2 Using I-7188 I/O Expansion Boards:
The I-7188X series can plug an I/O Expansion board inside
the main body. To install it, users have to loosen the screw
and remove the shell of I-7188XA / I-7188XC / I-7188XB / I-
7188EX / I7188XG / I7188EG. The supported I/O expansion
boards are as below. It will be more.
1.3 Overview:
Even though the 7000 family is so powerful, there are some
applications chart cannot be solved, such as:
High speed applications
Special hardware requirement applications
Special software requirement applications
Combine special hardware & software applications
So we developed an I/O expansion bus in the 7188X / 752N /
7188E family to solve all these applications above. The I/O
expansion bus can be used to implement various I/O
functions such as D/I, D/O, A/D, D/A, Timer/Counter, UART,
I/O Expansion Bus for 7188X/7188E User’s Manual, Jan/2005 v1.5, 7PH-000-15---5