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Author Topic: need help about iec 62056-21 optical port  (Read 3715 times)
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pecpys
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« on: March 03, 2010, 07:32:31 07:32 »

Do you have any schematic diagram for optical communication following ICE 62056-21 for electronic meter?
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DreamCat
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« Reply #1 on: March 06, 2010, 10:21:57 10:21 »

want read value?
the IR tranciver part of meter is very simple, it usually use 38k carry. data speed 1200bps.
it according rs485 standard.
if you know the IR remote, you can draw it by yourself.
or I can draw for you .
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pecpys
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« Reply #2 on: March 09, 2010, 05:35:21 05:35 »

want read value?
the IR tranciver part of meter is very simple, it usually use 38k carry. data speed 1200bps.
it according rs485 standard.
if you know the IR remote, you can draw it by yourself.
or I can draw for you .

Please help me to show schematic diagram for IR communication.
Thanks you Wink
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DreamCat
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« Reply #3 on: March 10, 2010, 07:24:24 07:24 »

here is a example, use AVR chip ATMEGA8's UART. or you can other mcu, but note the pull resistor in some mcu.
since IR transmite need modulate at 38kHz, so need a carrier, this on pin of IC1 provid. it didn't use ppm modulate for low speed 1200bps.
the chip IC2 is a IR demodulate,center frequency is 38kHz.

if you want to use pc com port directly, you need a circuit to generate a 38kHz carrier, and TTL-RS232 convertor.
I don't know which kind is you need.

best reguads!

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