The ex-47901 rs-232 to rs-485 converter is design for your pc. Workstation. Thin client or server to provides instant rs-485 serial port expansion via the standard rs-232 port. The ex-47901 equipped a db9 female connector that can be connected directly to the rs-232 connector from your pc. The ex-47901 converts unbalanced. Full-duplex rs-232 signals to balanced half-duplex rs-485 signals. The rs232 port. Configured as a dce port. Has a female db9 connector with pins 2 txd input . 3 Rxd output . And 5 signal ground supported. Pins 7 rts and 8 cts are tied together. And pins 6 dsr . 1 Cd . And 4 dtr are also tied together.