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Black Box Async RS232 to RS422/485 Interface Converter - DB9 to Terminal Block (IC820A)

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.

Specs

Reviews

Model
Brand	Black Box
Series	Async
Model	IC820A
Part Number	IC820A
Converter Type	Async RS232 to RS422/485 Interface Converter

Performance
Color	Black

Connection
Other Connector	(1) DB9 (Female); (1) Terminal Block

Power
Power Supply	Barrel Connection from Power Supply sold separately or Interface

Specification
Specification	5 Years Double Diamond™ Warranty (Standard)

Feature
Feature	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.

Additional Information
First Listed on Newegg	March 17, 2026

Please contact the Seller directly for warranty information. Warranty information may also be found on the Manufacturer's website.
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