SIMCom SIM808 SD card problem


#1

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=?” and related commands for example AT+SD2PCM? , AT+SD2PCM=1 and Etc to the module, it returns ERROR message. Can anyone help me to solve this problem? Thanks.


#2

Hi…I have problems with ma SIM808 GSM/GPS module. I have a custom made PCB where i am using SIM808 module to send some data to my web server.
I have produced around 100 pcs of PCB.
On a few pieces of PCB i have a problem that after some period of time (6 months - 1 year), the module can not (or it is very hard, must reset few times or wait for few minutes) register to the GSM network anymore.

printed circuit board


#3

Check with network if they have blacklisted the modules IMEI due to improper activity.