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Current Loop to RS232 Converter

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Shaun22

New Member
Hi,

I would like to build a current loop to RS232 converter but have been batteling to find a circuit. I am looking for anything from 25mA to 40mA as I would like to finish a project I am working on. Does anyone know where I can find a circuit and parts list for such a device or does anyone have one? Any assistance will be greatly appriciated

Thanks in advance
 

Nigel Goodwin

Super Moderator
Most Helpful Member
Shaun22 said:
Hi,

I would like to build a current loop to RS232 converter but have been batteling to find a circuit. I am looking for anything from 25mA to 40mA as I would like to finish a project I am working on. Does anyone know where I can find a circuit and parts list for such a device or does anyone have one? Any assistance will be greatly appriciated

Thanks in advance

It used to be quite common, but I haven't seem a circuit for many, many years - I can't even remember now what the current used actually was (although 20mA sounds vaguely familiar!).

I did have a nice simple circuit at home somewhere, I'll see if I can find it, but I'm fairly doubtful that I can now.

From what I can remember, it's quite easy to do - I'm sure someone else will have more recent info.
 

Shaun22

New Member
Hi Nigel,

Thanks for the response, yes a 20mA circuit is an industry standard although I require a higher current rating, I dont think it will be too difficult to modify the circuit to suit the current. Thanks anyway.
 
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