S.I. Tech, Inc. RS-232/RS-422 Optical Isolator Modems
     
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  Optical Isolators are used to protect data lines while making RS-232/RS-422 connections. Shown below are the Opto Isolators offered by S.I. Tech.

Opto Isolator Bit-Drivers®

Product Protocol Key Features
2281
HTML | PDF 		Optical Isolate
RS422 to RS422 		External Power, (Requires 2121 Power Supply)
Isolation - 1000VAC between the DTE port and the DCE and power ports
2282
HTML | PDF

Photo

 Optical Isolate
RS232 to RS232 		External Power, (Requires 2121 Power Supply)
Isolation - 1000VAC between the DTE port and the DCE and power ports

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