SIM A7670c UART communication is not working

[sandeepvasekara]

I am using the SIM A7670c module with Arduino UNO to establish UART communication. In the serial monitor, initialization messages like

*ATREADY: 1

+SMS FULL

+CGEV: EPS PDN ACT 1

+CGEV: ME PDN ACT 8,1

can be seen. But, there is no response from the module when trying to send AT commands through the serial monitor. While using the logic analyzer, it can be seen that data is being sent from Arduino to the gsm module and not vice-versa. Any leads on the issue is much appreciated. TIA

[Railroader]

Not enough of information posted.
Her's what forum asks for: How to get the best out of this forum - Development Tools / IDE 1.x - Arduino Forum

[J-M-L]

how do you power it? how did you wire the UART part? are GND joined? is your module 5V compatible?

That's the type of questions we would have...

[gilshultz]

@sandeepvasekara

Any leads on the issue is much appreciated

How to Get the Right Help Faster:

You can spend weeks spinning your wheels, or you might get lucky and solve your problem quickly. To avoid unnecessary delays, it’s crucial to provide an annotated schematic of your circuit as you have it wired, showing all connections, including power, ground, and supplies.

Why Detailed Information Matters:

• Annotated Schematics: These are essential because they show exactly how your circuit is set up. Without them, it's difficult for anyone to understand what you’ve done, which makes troubleshooting nearly impossible. Fritzing diagrams or unclear pictures are not enough.
• Technical Information: Many modules look similar and may even have the same name, but they can function differently. This is why we always ask for links to detailed technical information—not just sales pages like those on Amazon, which often lack the specifics we need.
• Show All Connections: It’s important to include every connection, especially power and ground, in your schematic. Missing these details makes it hard to determine if a setup issue might be causing your problem.

My Process:

When I see a question, I spend a moment assessing it. If it’s missing critical information, I might ask for it. However, if it's repeatedly lacking important details, I may assume the questioner is not serious and move on to another query.

What You Need to Consider:

We don’t know your skill level or what resources you have available. If you’re missing key technical details or seem unprepared, it may indicate that you need to spend more time learning the basics before starting your project.

Providing the right information upfront will help you get the best possible assistance and avoid the frustration of running into dead ends. Let us help you by sharing what you have clearly and completely!