Black Box IC820A Async RS232 to RS422/485 Interface Converter, DB9 to Terminal Block

Features:

• 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.

• Transmit data up to 115 kbps or at distancesup to 4000 ft.
• Operates in point to point or multipoint applications
• Operates 2-wire half-duplex or 4-wire half- or full-duplex.
• async (data leads) only.
• Up to 32 RS485 devices can be attached to create a large multi-drop network
• The RS485 driver is automatically enabled during each spacing state on the RS232 side.