# Encoder voltage level converter and optical isolator

**URL:** <https://forum.deltamotion.com/t/encoder-voltage-level-converter-and-optical-isolator/101>\
**Category:** General\
**Created:** [August 30, 2010, 9:38pm UTC](https://forum.deltamotion.com/t/encoder-voltage-level-converter-and-optical-isolator/101 "2010-08-30T21:38:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Jacob\_Paso](https://forum.deltamotion.com/letter_avatar_proxy/v4/letter/j/439d5e/32.png) [@Jacob\_Paso](https://forum.deltamotion.com/u/Jacob_Paso)\
**Post date:** [August 30, 2010, 9:38pm UTC](https://forum.deltamotion.com/t/encoder-voltage-level-converter-and-optical-isolator/101/1 "2010-08-30T21:38:35Z")

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The RMC quadrature encoder inputs require 5V differential (RS-422) signals. If your encoder has a higher voltage level, such as 24V, you can use the following device to convert the signal to the correct 5V differential level. This device also provides optical isolation. Notice that there are several part numbers. The one below is for converting 24V signals levels to 5V. Some other versions of these BEI converters can be used to convert encoders with Open Collector outputs to RS-422 signals.

Sensata Optical Isolator Module  
Part number: EM-DR1-IC-24-TB-28V/5 (60001-011)  
[http://www.sensata.com](http://www.sensata.com)

Automation Direct   
Part number: FC-ISO-D  
“_Signal conditioner, isolated, differential or single ended line driver input, differential line driver output, 24 VDC operating voltage, 35mm DIN rail or panel mount, removable screw terminal plugs._”  
[http://www.automationdirect.com/](http://www.automationdirect.com/)

For more details, or to suggest a product to be added to this list, send an email to [support@deltamotion.com](mailto:support@deltamotion.com).