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Black Box Async RS232 to RS422/485 Interface Converter IC821A

Black Box Async RS232 to RS422/485 Interface Converter IC821A
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General Information

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.

Interfaces/Ports
Total Number of Ports:2

Power Description
Power Source:Power Supply
Plug/Connector Type:Terminal Block

Physical Characteristics
Form Factor:External
Height:1.7"
Width:0.9"
Depth:3.9"

Miscellaneous
Additional Information:

Features:

  • Features 2000-VAC isolation
  • Selectable RS-422 operation
  • Select RS-485 for 2-wire half-duplex or 4-wire full-duplex
  • Auto RS-485 driver control.
Environmentally Friendly:Yes
Country of Origin:United States
TAA Compliant:Yes

Warranty
Limited Warranty:1 Year

WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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Shipping Restrictions
  • This item cannot be shipped to PO Boxes.
  • This item can be shipped only within the U.S.

Special Order Item

This item ships directly from the manufacturer and is not stocked in our warehouse. If stock is available at the manufacturer, the item will ship directly to you, usually within 7 - 15 business days.

Once the order has been sent to the manufacturer it can no longer be canceled.

If payment is made via credit card it will be charged before the order is sent to the manufacturer.

You must contact the manufacturer directly regarding returns and defective items.

We will contact you by email if the item is sold out or backordered (and we were unable to update the site before you placed the order) or if the item will be delayed longer than expected.

We have no control over the speed of the manufacturer's order processing, or whether they will honor your request to ship the item by any particular method.



  • UPC: 822088100348 
  • Mfr's Part #: IC821A