Extending SCI Circuit of RS232to RS422based on PLA
Jun-Jie Huang · International Electronic Elements · 2004
Based on a PLA(programmable logic array)is introduced a hardware design method of extending SCI(serial communication interface)from one channel RS232to four channels RS422.The extending circuit don't change the hardware of PC and is a simple configuration.It can be used widely in the multi computer communiˉcation.