The 485TBLED converts unbalanced, full duplex RS 232 signals to balanced, full or half duplex RS 422 or RS 485 signals. RS 485 is an enhanced version of the RS 422 Standard. It allows multiple drivers and receivers on a two wire or four wire system.
The RS 232 port, configured as a DCE port, has a female DB25 connector with pins 2 (TD input), 3 (RD output), and 7 (Signal Ground) supported. Pins 4 (RTS) and 5 (CTS) are tied together, and pins 6 (DSR), 8 ( CD), and 20 (DTR) are also tied together. Pins 1 (Frame Ground) and 7 (Signal Ground) are connected straight through to the RS 485 terminal blocks. The RS 485 terminal blocks support Transmit Data (A) and (B+), Receive Data (A) and (B+), Frame Ground, Signal Ground, and +12 VDC input.
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