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I am working with SIMCom's SIM808 2G+GPS modem and trying to connect it to an SD card. I am following SIMCom hardware design docs, to save some data in SD memory.

The problem is: when I send command "AT+SD2PCM=1" to the module, it returns ERROR message. Can you help me to solve this problem? Thanks.

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  • \$\begingroup\$ I have read the relevant documentation.bat i reply error on"AT+SD2PCM=?" command.do you help me? please. \$\endgroup\$ – a.yazdekhasti Nov 30 '18 at 16:08
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Have you looked at this document ?

Setting mode = 1 means "PCM interface is valid".

Setting to 0 means SD card.

Also, in these cases, you should generally try the query command first - to see its response: AT+SD2PCM=?

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