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How to interpret POST CARD codes?

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First post, by psaez

Posted on 
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Hi, about this post card: https://es.aliexpress.com/item/1005005450431935.html

The manual talks about codes of two digis, but the card has 4 digits, so codes have 4 numbers/letters. So I think the manual is wrong. Can you explain me how to identify the codes?

Also there are 8 leds, and the manual doesn't tell anything about how to interpret these leds

Thank you...

Reply 1 of 1, by paradigital

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The two left most digits are the current code. The right two are the previous code.

The LEDs indicate the status of various voltages and signals.

12v - Self explanatory
-12v - Self explanatory
5v - Self explanatory
-5v - Self explanatory
Clock - A valid clock signal.
Frame - Not sure.
Ready - High/On is good.
Reset - Typically held high (on) briefly, then should go low.

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