AUTOMATIC HOST / SLAVE SWITCHING SYSTEM FOR RS485 COMMUNICATION

摘要

The present invention relates to an automatic host / slave switching system for RS485 communication and, more specifically, to an automatic host / slave switching system for RS485 communication, which is capable of configuring a communication control means for performing a role of a host device in an RS485 communication environment comprising a computer terminal and slave devices to allow the communication control means to transmit a data request command signal to the slave devices instead of the computer terminal if the computer terminal cannot transmit the data request command signal due to the power-off of the computer terminal, program error, computer failure, etc. to consecutively manage the status information of the slave devices. According to the present invention, the automatic host / slave switching system for RS485 communication has the effect of consistently upgrading the status information of slave devices despite the power-off of a computer terminal by configuring a communication control means for performing a role of a host device in an RS485 communication environment comprising the computer terminal and the slave devices to allow the communication control means to transmit a data request command signal to the slave devices instead of the computer terminal if the computer terminal cannot transmit the data request command signal due to the power-off of the computer terminal, program error, computer failure, etc. to consecutively manage the status information of the slave devices.;COPYRIGHT KIPO 2014;[Reference numerals] (100) Computer terminal; (300) Communication control means