To RS-232 serial port’s TXD and TXD signals into balanced two lines of half duplex RS-485 signals No external power supply, can be directly from the RS232 port of the 3 foot breaking point, from 7 feet at the same time send a request (RTS), 4-pin data terminal ready (DTR) to HEXIN-III auxiliary power supply, automatic flow control so that you do not have to re-setup, hardware and installation is very simple SKU: 60.0110 Categories: CABLES & ADAPTERS, Serial & Parallel