Google Answers: SD Cards and RS-232

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Q: SD Cards and RS-232 ( No Answer, 1 Comment )

Question

Subject: SD Cards and RS-232
Category: Computers > Hardware
Asked by: beefsister-ga
List Price: $20.00

Posted: 08 Mar 2005 17:40 PST
Expires: 07 Apr 2005 18:40 PDT
Question ID: 487056

Is there a direct pinout "cross-conversion" from 9-pin, RS-232 to 9
pin SD (Secure Digital) cards?

Answer

There is no answer at this time.

Comments

Subject: Re: SD Cards and RS-232
From: neutron_coding-ga on 08 Mar 2005 18:18 PST

I'm assuming you want to directly connect your RS-232 serial port to an SD card. 

Firstly, the voltages are not compatible between the two. SD cards use
between 2.0 and 3.6 volts, where as RS-232 voltages range between -12
and +12 volts.
See:
http://www.sandisk.com/pdf/oem/SD_Physical_specsv101.pdf
http://www.arcelect.com/rs232.htm

Even with a converter that would convert the RS-232 signals into 2-3.6
volts (MAX 232 it's called, if I remember correctly) I believe you
would still need software to communicate with the SD card, since
RS-232 and SD SPI Bus mode aren't compatible.

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