[GreenKeys] 60 ma current loop to RS232 converter

[Paul Birkel]

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Jerry Murphy
Sent: Saturday, February 24, 2018 11:59 PM
To: Green Keys
Subject: Re: [GreenKeys] 60 ma current loop to RS232 converter

 

Regarding the Black Box Current Loop Interface Unit - 232/CL-E:

There are two versions of the 232/CL-E.  The first is the CL050A which is intended for low
voltage use.  Low voltage means that it is looking to key a selector magnet driver.  It should
not be used to directly key the magnets.  The CL050A can supply an 18 volt loop at either
20 or 60 ma.  As a passive device, it can key a loop as long as it does not exceed 30 volts.
Here's the link to the manual for the Black Box CL050A:
    http://ftp.blackbox.com/manuals/C/CL050A.pdf

…  The CL050A can be made to work with high voltage loops by the addition of a few
outboard components. …

I've used the Black Box CL050A and it works just fine.

Jerry Murphy

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I’m ever-curious Jerry.  Would you mind elaborating on “addition of a few outboard components”?  Guessing that there’s a solid-state relay involved …

 

Thank you,

paul

 

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