Hello, I am working with an RC7620-1 connected to an MCU thru UART interface (all inside a more complex board with many other components and I/O). Now I have spent few days sending AT commands to the module and I don’t get any response.
Does anybody know what might be the problem?
I have followed the power up procedure, verified the Tx/Rx communication code and still cannot find a good reason for not getting answer from the module.
What I have assumed is that I can send AT commands by default using UART interface but have not found any documentation to confirm it.
I have access to UART Tx/Rx pins but I have not found the Windows 10 USB drivers to make tests using a serial communication application, so if anybody can provide the drivers or a link to it would be very helpful
Please, any help/suggestion would be greatly appreciated.
Hi migmel2006,
Welcome you to our community.
Do you know the firmware RC7620-1 version you are using?
You can try to download the Windows USB driver at the below link and retry.
https://source.sierrawireless.com/resources/legato/drivers-for-wp75xx_wp76xx_wp8548-series-modules---latest-release/#sthash.W1OkDIVF.dpbs
Hello, thank you.
I’m not sure about the firmware version.
After installing this should I see the AT COM port in device manager ? Because I cannot see any COM port besides the one I’m connected to
Hi migmel2006,
Yes, you should see the AT Modems COM port in the device manager. You need to connect to the module’s USB port.
hi @jyijyi
I want to send an AT command from the MCU and I want to Receive response from the RC7620 modem side.
i am trying with the STM32 board I am not able to receive an response from the modem
can you pls suggest me on this
Thanks and Regards
Manjunath
Are you using uart or usb to send AT command?
hi @jyijyi
I am using USB port which is assessable to give an AT commands to the RC7620 I am getting response from that.
But I want to send an AT command threw the MCU threw uart how can we do that I am using TXD and RXD pin of RC7620 is 8 and 10
hi @jyijyi
An source code is available to send the AT command from MCU to RC7620 and receive the response from RC7620?
Thanks
Manju
you can see the program “ATcmd_Test2.rar” inside this document: