Added a subject !!!

> What program in asembler can send 4 bytes through rs422 port to  
> PIC16F627A

A lot of that depends on what kind of network the PIC is on. You
could write some very complex code for it to be a driver / receiver.
If the PIC is just listening, the code would be quite simple

> and then this pic
> send this bytes (4 x 8bits)to LEDs (8 LEDs in 4 groups).

Use 4 x 8-bit shift registers, eg 74HC164. Each output of each
shift register controls one LED

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist