RS-422 and RS-485 communication repeater

摘要

This research is about the repeater of serial data communication system. Adding repeater to the communication system under the specifications of rs-4222 and RS-485 increases the number of communication offices that can be added between the above communication offices, and increases the transmission signal and output in the repeater In order to increase the transmission distance,The reverse and non reverse transmission signals transmitted outside the repeater are converted into signal levels and output to the internal circuit of the repeater,The signal transmitted by the internal line of the repeater is converted into a signal level and output to the first and second driver units (41, 44) on the external transmission channel;The first and second control signal generating units (42, 43) are composed of the control signal output of the driver unit corresponding to the transmission signal input from one of the first and second driver units (41, 44).On the other hand, the first and second control signal generating units (42, 43) adjust the visibility through externally recognized variable resistors and capacitors, and are characterized by generating control signals. The control signals output by the first and second control signal generating units (4243) are the first and second driver units (41, 44) is characterized by determining the receiving and transmitting directions.