Black Box IC820A serial converter/repeater/isolator RS-232 RS-422/485

Quick Facts - Converts RS-232 to 4-wire RS-422 or to 2- or 4-wire RS-485. - Bidirectional data conversion. Further Details - Enables you to select RS-485 2-wire half-duplex or RS-485 4-wire full-duplex operation. - Selectable RS-422 operation with transmit and receive always enabled. - Automatic RS-485 driver control, so it works without any special programming for handshaking signals. Also enables transmitter from RS-232 TD signal and receiver when not transmitting. - Built-in bridging switches for 2- or 4-wire operation with no external jumpers to set. - Set operating mode with four switches. - Converts using either port power or power from an external 120-VAC/12-VDC power supply (sold separately). - No external power is required if two RS-232 output handshake lines are available.