User Manual

The combination of serial & parallel interface make the I/O expansion bus

very convenient & powerful for various industry applications. There are many

design examples given in “I/O Expansion Bus in the 7188X/7188E User’s

Manual”. All hardware circuit & software driver sources are OPEN for

modification. From these examples, the user can make new applications or

modify them for their special requirements. The system design steps are given

as follows:

Step 1: list all functions required

Step 2: for all functions, goto step 3. If all functions are solved  STOP

Step 3: if this function can be solved by 7000 module  goto step 2

Step 4: if this function can be solved by 7188X+X???  goto step 2

Step 5: user designed special hardware for I/O expansion bus

Step 6: user writes special software driver for this hardware

Step 7: combine the special hardware & software as a new module

Step 8: goto step 2

After the above steps, user can combine the standard 7000 modules &

special modules to solve all applications in the same RS-485 network. The

system is given as following:

7520

RS232

Host PC

RS485

Standard 7000 module

RS485

Customized 7000 module

(7188X+X???)

Customized 7000 module

(7188X+X???)

7521/2/2A/3/4/7 Series Hardware User’s Manual, Ver. 1.5 Sep/2002, 7Mh-001-15 -----57