-232 -485 Apparatus for RS-232C and RS-485 Serial Communication using Common Communication Port

摘要

The present invention relates to a serial communication device, which can perform RS-232C communication and RS-485 communication through a common communication port and selectively use RS-232C and RS-485 communication without changing hardware or terminal wiring . The communication port converting means provided corresponding to each channel selects a signal received from the outside via an RS-232C driver and an RS-485 driver, an RS-232C driver or an RS-485 driver commonly connected to a communication port of the corresponding channel An RS-232C control unit for activating / deactivating the RS-232C driver, and an RS-485 control unit for controlling transmission / reception operations of the RS-485 driver.