Black Box IC821A Leaflet

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

04/13/2010 

#26796

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  Converts RS-232 to 4-wire RS-422 or to 2- or 4-wire 

RS-485.

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  Bidirectional data conversion.

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  Select RS-485 2-wire half-duplex or RS-485 4-wire  

full-duplex operation.

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  Optically isolated circuits protect it from overvoltage 

damage caused by ground loops, surges, and spikes.

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  RS-422 operation with transmit and receive always 

enabled.

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  Set operating mode with four switches.

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  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.

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  Built-in bridging switches for 2- or 4-wire operation 

with no external jumpers to set.

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  Converts using either port power or power from  

an external 120-VAC/12-VDC power supply (PS1003, 
ordered separately). No external power is required  
if two RS-232 output handshake lines are available.

Interface — RS-232, 4-wire RS-422, or 2- or 4-wire RS-485

Connectors — (1) DB9 female; (1) 5-wire connector for TD A(-), TD B(+),  

RD A(-), RD B(+), and GND; (1) 2-wire connector for Power and GND

Indicators — (2) LEDs: (1) TD, (1) RD

Power — From the interface or from optional 120-VAC/12-VDC wallmount 

power supply

Size — 1.7"H x 3.9"W x 0.9"D (4.3 x 9.8 x 2.3 cm)

Weight — < 0.1 lb. (< 0.1 kg)

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

       

 

  120-VAC/12-VDC Wallmount Power Supply