Black Box IC821A Universal RS-232 to RS-422/RS-485 Converter, Opto-Isolated

Black Box IC821A Async RS232 to RS422/485 Interface Converter, DB9 to Terminal Block
Model: IC821A
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Black Box IC821A Async RS232 to RS422/485 Interface Converter, DB9 to Terminal Block

The Universal RS-232 to RS-422/485 IC821A 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 a 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.

Key Features

  • 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
  • 1 Year Double Diamond™ Warranty (Standard) included

Note

Power Supply (PS1003) is not included, but is required. See the Product Accessories tab above.

Technology
CategorySerial Connectivity
Transfer Rate115.2 kbps
Serial Interface
CategorySerial to Serial
Power
ConnectionTerminal Block or Interface
Isolation Protection2000 VAC
Ratings
Operating Temperature32 to 158° F (0 to 70° C)
Download NameFile Size
Black Box IC821A Data Sheet187.55KB
Tags: IC821A