Black Box Ic820A Universal Rs-232 To Rs-422/485 Bidirectional Converter

Allows You To Select 2-Wire Rs-485 Or 4-Wire Rs-485 Full-Duplex Operation. Selectable Rs-422 Operation With Transmit And Receive Always Enabled. Automatic Control Of The Rs-485 Driver, So It Works Without Any Special Programming For Handshake Signals. Also Allows The Transmitter To Operate The Rs-232 Td Signal And The Receiver To Operate When Not Transmitting. Built-In Jumper Switches For 2- Or 4-Wire Operation With No External Jumpers To Configure. Set The Operating Mode With Four Switches. Converts Using 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 Protocol Lines Are Available. _Delete_