Black Box Universal RS-232 to RS-422/485 Converter, 2-Port Transceiver, 2000V Opto-Isolation, Auto Driver Control, RoHS TAA Compliant - IC821A (1 Year Warranty)

Black Box IC821A RS-232 to RS-422/485 converter showing DB9 connector, terminal blocks, and status LED indicators against white background-alternate-image1
Black Box IC821A RS-232 to RS-422/485 converter showing DB9 connector, terminal blocks, and status LED indicators against white background-alternate-image1
Black Box IC821A RS-232 to RS-422/485 converter showing DB9 connector, terminal blocks, and status LED indicators against white background-alternate-image1
Black Box Universal RS-232 to RS-422/485 Converter, 2-Por...
Black Box IC821A RS-232 to RS-422/485 converter showing DB9 connector, terminal blocks, and status LED indicators against white background-alternate-image1

Black Box Universal RS-232 to RS-422/485 Converter, 2-Port Transceiver, 2000V Opto-Isolation, Auto Driver Control, RoHS TAA Compliant - IC821A (1 Year Warranty)

Black Box IC821A

563.00 SR 831.00 SR Save 268 SR
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  • 1 Year Warranty
  • 30 Day Returns
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Product Key Features

  • 🔄 Universal RS-232 to RS-422/485 signal conversion
  • ⚡ 2000-VAC isolation protection
  • 🔌 2 ports with DB9 female connector for RS-232
  • 🛠️ Selectable RS-422 and RS-485 operation modes
  • 🔁 Auto RS-485 driver control without external software
  • 🔀 Supports 2-wire half-duplex or 4-wire full-duplex
  • 📦 Compact size: 1.7" x 0.9" x 3.9"
  • 🏆 TAA Compliant and RoHS certified
  • 🔋 Terminal block power connection
  • 🛡️ 1-year limited warranty
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Black Box

IC821A

Black Box Universal RS-232 to RS-422/485 Converter with Opto-Isolation

Transform your serial communication capabilities with the Black Box IC821A Universal RS-232 to RS-422/485 Converter. This professional-grade converter features 2000-VAC opto-isolation and seamlessly converts RS-232 signals to RS-422/RS-485 signals and vice versa, requiring no external software for data flow control.

Advanced Communication Features

  • Robust 2000-VAC isolation protection
  • Selectable RS-422 operation modes
  • Versatile RS-485 configuration for 2-wire half-duplex or 4-wire full-duplex
  • Automatic RS-485 driver control
  • DB9 female connector for RS-232 DCE interface
  • Removable terminal block for RS-422/RS-485 connections

Technical Specifications

Specification Detail
Dimensions 1.7" (H) x 0.9" (W) x 3.9" (D)
Form Factor External
Port Configuration 2 Ports (RS-232 and RS-422/485)
Power Interface Terminal Block

Compliance and Warranty

This TAA-compliant device is manufactured in the United States and meets RoHS environmental standards. Backed by a comprehensive 1-year limited warranty, ensuring reliable performance for your industrial communication needs.

The BLACK BOX® Universal RS-232 to RS-422/485 Converter with Opto-Isolation isolates and converts RS-232 signals into RS-422/RS-485 signals and vice versa. Unlike other converters, external software is not required to control data flow. The RS-232 input is wired for DCE through a DB9 female connector, and RS-422/RS-485 signals are interfaced through a removable terminal block. To supply external power to the terminal block, you need our 120-VAC/12-VDC Wallmount Power Supply (PS1003).

For RS-232, the connection requires RD, TD, and Signal Ground.

In RS-422 mode, the driver is always enabled for full-duplex communications. A twisted pair is required for transmit, and a twisted pair is also required to receive. A ground reference wire is also needed. Switch settings are Switch 1: RS-422; Switch 2: Echo On; Switches 3 and 4: 4 Wire.

In both RS-485 modes, the RS-485 driver is automatically enabled during each space state by the presence of an RS-232 signal. When the RS-232 data is in a mark or idle state, the RS-485 driver is disabled and the RS-485 data lines are held in a mark state by the bias provided by a 4.7-ohm resistor; the value of this resistor may need to be changed, depending on the termination you use.

To connect to several RS-485 devices with minimal wire, select the unit's 2-wire, half-duplex RS-485 mode. When data is requested, the addressed device transmits and then reverts back to receive status. Switch settings for this mode are Switch 1: RS-485; Switch 2: Echo Off; Switches 3 and 4: 2 Wire.

For 4-wire master/slave circuits, select the unit's 4-wire, full-duplex RS-485 mode. In this mode, addressed devices can receive data while transmitting data from a previous request. When used as a master in a single-master system, Switch 1 may be selected because the unit is the only transmitter in the system. When used as an RS-485 slave, the RS-232 device must provide addressability. Biasing in a master/slave system is provided by the end-of-line slave. Switch settings for this mode are Switch 1: RS-485; Switch 2: Echo On; Switches 3 and 4: 4 Wire.

Return Policy

Time to Return

Standard Return Policy

We offer a hassle-free 30-day returns policy for domestic (US) orders, excluding non-refundable items. Refund or Replacement within 30 days of the delivery date. All products that fall under the Standard Return Policy qualify for our 30-Day Hassle-Free Returns. Please see the section above for more details.

Replacement Only Return Policy

Replacement within 30 days of the delivery date.

Manufacturer Only Return Policy

Covered by the manufacturer's warranty. Please refer to the terms and conditions for the manufacturer's warranty or contact the manufacturer.

Holiday Extended Return Policies

Extended Holiday Return Policy.

Qualifying purchases of products displaying the " Extended Holiday Return Policy ", from November 1st, 2023 to December 25, 2023, are eligible for a Refund or Replacement until January 31, 2024.

Extended Holiday Replacement-Only Return Policy

Qualifying purchases of products displaying the " Extended Holiday Replacement-Only Return Policy ", from November 1st, 2023 to December 25, 2023, are eligible for a Replacement until January 31, 2024.

Black Box IC821A RS-232 to RS-422/485 converter showing DB9 connector, terminal blocks, and status LED indicators against white background

Industrial-Grade Signal Conversion with 2000V Isolation Protection

The IC821A converter delivers reliable RS-232 to RS-422/485 signal conversion with built-in 2000V isolation protection. Its robust design features clear terminal labeling and status indicators for TD and RD signals, ensuring proper connection and monitoring of data transmission. The compact form factor houses sophisticated circuitry that enables automatic RS-485 driver control and flexible configuration options through DIP switches. The removable terminal blocks provide secure connectivity while allowing for easy installation and maintenance in industrial environments.

Technical Specifications

  • 2000V AC isolation protection for equipment safety
  • Dual interface support with DB9 female connector and terminal blocks
  • Auto-sensing RS-485 driver control for optimal data flow

Applications

  • Industrial automation systems requiring signal conversion
  • Manufacturing equipment integration with legacy serial devices
  • Process control systems with mixed RS-232 and RS-422/485 protocols
FAQ
The Black Box Universal RS-232 to RS-422/485 Converter features 2000-VAC isolation, selectable RS-422 operation, RS-485 support for both 2-wire half-duplex and 4-wire full-duplex modes, and automatic RS-485 driver control. It doesn't require external software for data flow control and comes with a DB9 female connector for RS-232 input and a removable terminal block for RS-422/RS-485 signals.
The converter has compact dimensions measuring 1.7 inches in height, 0.9 inches in width, and 3.9 inches in depth. It features an external form factor design that makes it easily accessible and installable.
In RS-485 mode, the driver is automatically enabled during each space state by RS-232 signal presence. When RS-232 data is in mark or idle state, the RS-485 driver disables and data lines are held in mark state by a 4.7-ohm resistor. It supports both 2-wire half-duplex and 4-wire full-duplex operations, with specific switch settings for each mode.
The converter requires external power supplied through a terminal block connection. It specifically needs a 120-VAC/12-VDC Wallmount Power Supply (PS1003, sold separately) to function properly.
The converter is RoHS certified and TAA compliant. It's environmentally friendly and manufactured in the United States, meeting various regulatory standards for electronic equipment. The 2000-VAC isolation certification ensures robust protection between input and output circuits.
For RS-422 mode configuration, set Switch 1 to RS-422, Switch 2 to Echo On, and Switches 3 and 4 to 4 Wire. In this mode, the driver is always enabled for full-duplex communications, requiring a twisted pair for transmit, another for receive, and a ground reference wire.
The Black Box Universal RS-232 to RS-422/485 Converter comes with a 1 Year Limited Warranty, providing coverage against manufacturing defects and ensuring customer support during this period.
In 2-wire half-duplex RS-485 mode, the device allows connection to multiple RS-485 devices with minimal wiring. The configuration requires Switch 1 set to RS-485, Switch 2 to Echo Off, and Switches 3 and 4 to 2 Wire. In this mode, devices transmit data when requested and then return to receive status.

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