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.
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Overview
Specs
Reviews
Black Box Async RS232 to RS422/485 Interface Converter - DB9 to Terminal Block (IC820A)
Learn more about the Black Box Corporation IC820A
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
February 22, 2026
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Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
Please contact the Seller directly for warranty information. Warranty information may also be found on the Manufacturer's website.