sherazi
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How you have solved the problem as i have the same issue with sim900d.It is ot responding to AT commands at all after power up.
Hi, I am using Simcom SIM900D. I just want to interface this module with PC hyper terminal. I have followed all the precautions and design mention in hardware design. When I power up the module it send "ΔΔΔΔ" on hyper terminal @ 9600 baud rate and send nothing on different baud. (It is mentioned in the manual that it should not send any data when using in auto baud mode). After that it stops responding. Any suggestion to solve this issue??
Thanks in advance
wasif
hello sir..i have the same problem..my sim900d is not responding to AT commands..its get hanged when i turn it on..it sends 4 delta on the screen..any help please..
sim900 is set to auto baud by factory default,
what i did was to send at+ipr=xxxx baudrate i am using continously until i got the response Ok,
Hi,
Question about voltage on RS232 input on the SIM900d module..
What kind of RS232 interface do you use between the PC and the SIM900d modem module. MAX232 is designed for
5V use and output and SIM900d has a limitation of max. 3.0V on its input.
Did you put in a voltage divider (resistors) between TX from MAX232 and the RX on the module or?
(I know there are MAX232 versions for use with 3v output but for my prototype I don't have this)
that s not true..my sim900 is working fine with elm317 and 7805..it is sending and receiving messages prfctly..
Is there any way to get current time from the network? If there is what are the AT commands for that?
Is there any way to get current time from the network? If there is what are the AT commands for that?
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