[SOLVED] Unable to connect 900a GSM module with PC

[djeceymca]

Hello Guys,

I have just purchased a 900a GSM module and I am trying to connect it to my Laptop via RS232 to USB convertor.

First of all, When I switch on the GSM module, it's receiving calls. I hope that means GSM module is working fine

But when i connect it to my Laptop, I am facing issues:
1. USB connection kept disconnecting.
2. Error in putty, Unable to connect to COM3 port

Could guys please help me out here, I am totally stuck.

Regards,
Dev

 

[djeceymca]

Its solved now, Problem was with RS232 to USB convertor.

 

[djeceymca]

Unable to connect 900a GSM module with PIC micro controller

Hello Guys,

I purchase a GSM SIM900a modem. I connected it to PC using RS232 port and able to give command to GSM modem via PC and GSM modem sending message as expected.

When I try to fire same set of commands to GSM modem via PIC microcontroller. No message is getting sent to outside world.

1. I have checked RX, TX pin connection. (CROSSED connection with GSM modem).
2. GND is also common.

Could you please suggest, How can I troubleshoot whats going wrong?

Regards,
Dev

 

[tasuki]

Re: Unable to connect 900a GSM module with PIC micro controller

Hi
1) check with baud rate if both module has same.
2) Need to check with code (if you wanted to share)