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SIM300S_V6.01 - problem with sending AT commands

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sidhu_roy2005

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sim300s_v6

hi,

iam using SIM300S_V6.01 module,in that iam using serial port 1 all signals.iam trying to send AT commands to the module.but it is not sending any response to that particular commands.pls hep me regarding this issue.
 

SIM300S_V6.01

Can you provide more details on what you are sending? What platform (PC or microcontroller)? How do you know the module is receving the data - have you verified with a scope?
 

Re: SIM300S_V6.01

the AT commands are sended through 16-bit uc via CPLD.iam sending the command only AT to GSM.this signal is seen through the scope.but iam not getting the response from the module.the pk-pk voltage is 3.3Vmax.in idle state the TXD signal is high(3.3V approx).SIM300 module supply is approx of 4.2V.

when i send Reset signal the module is turned on.this can be verified by SIM_CLK signal and SIM_VDD 2.9V generation.

help me regarding this issue.
 

Re: SIM300S_V6.01

sidhu_roy2005 said:
iam sending the command only AT to GSM.
Click to expand...
Are you sending a Carriage Return after the "AT"?
sidhu_roy2005 said:
when i send Reset signal the module is turned on.this can be verified by SIM_CLK signal and SIM_VDD 2.9V generation.
Click to expand...
When you say "Reset" signal, do you mean the "PWRKEY" pin? The "VDD_EXT " pin will go high when the module has powered-up. Also the "Network LED" pin should start toggling.
 

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