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RS232 to current loop 20 mA convertor

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Thanks :)
I have this one,
But I leave in Bulgaria and there is not possible to find this parts on local market.
May be I'll try ti change it with more popular parts.
I'll be happy to see other ideas
 
I've started project for reading control electricity meter in my home. Device has 2 way for reading.
1. Serial interface 20 mA current loop
2. Standard optical port.
If someone know how to build my own optical reading head this be useful for me.
 
Does this circuit work in reverse? 20mA to RS232?

hi,
This circuit is only for digital communication using 20mA current loop, not the 4mA to 20mA 'analog' signal type.

If you require only 'two way' 20mA/RS232 digital communication, the circuit already shows how this is done.
 
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