Tagged: ec25 pi uart
29 April 2019 at 12:07 AM #37794
I have a :
Raspberry Pi 3G-4G/LTE Base Shield V2 – with short header
Quectel EC25 Mini PCle 4G/LTE Module – EC25-AU
connected via the headers to a R Pi 3 B.
I have tired:
Nothing I do gives me a local echo back. I have tried ATE1 and ate1 and at+e=1 and at+e1
I am out of ideas.
Matt29 April 2019 at 12:46 AM #37795kyleu1967Participant
Have you tried connecting the device to a PC through a USB cable and opening a terminal? If you can get this working, then it will narrow down where the issue is.
Download and install the USB serial drivers for your board and use the terminal of your choice (i use Putty on windows). On my BG96 module i could only get it to work with version 1 of the driver.
Install the drivers, connect the device and power it on.
Check device manager and see if it displays the modem.
Once it shows up start a terminal with a baud rate of 115200bps
Then try the echo command ATE1 and press enter.
– Kyle.29 April 2019 at 3:10 AM #37797
NICE, THANKS. That works in Windows nice and happy.
In LInux, on the PI, I:
Added the modem to the shield
Added the shield to the Pi
Followed this: https://sixfab.com/updated-tutorial-2-make-a-ppp-internet-connection-with-sixfab-gprs-shield-on-raspberry-pi/ excluding the PI/UART selection, as my sheild above, does not have a selector
Tried it with the USB connected and without, it didnt make any difference
Am I missing something?
29 April 2019 at 3:51 AM #37799
- This reply was modified 9 months ago by matt_benett. Reason: formatting
I have just hooked it up to the Pi on USB, and that also works. So its only when I connect via the headers that I cant make it work.29 April 2019 at 10:32 AM #37806
Please check the Status of GPIO26, If it is HIGH, You will not able to see the ttyUSBx…
As GPIO26 is PERST pin. You will need to pull the pin to LOW.
PERST – The pin is used to hardware reset the module, by pulling it HIGH.29 April 2019 at 11:22 PM #37818
To confirm, when I plug it into the USB only, I do see it as ttyUSBx.
But when I plug it into the headers only, I do not see it as serialx (or can not get a echo back, I suspect I am not connecting to it though).
As per your description, this would not be related would it?
In this instruction there is a USB/Pi switch, my hat does not have this? https://sixfab.com/sending-sms-with-sixfab-gsmgprs-shield
30 April 2019 at 3:26 PM #37837
- This reply was modified 9 months ago by matt_benett. Reason: clarification
The Tutorial was written using GSM/GPRS Shield. While you are using EC25 and BASE SHEILD.
The AT commands for both shields are same.
There is a switch in the GSM/GPRS Shield which is mentioned in the tutorial.
For the Base Shield, there is no such switch. In order to use the Serial of the Base shield, You will need to bridge the UART resistor pads available below the Shield.30 April 2019 at 10:18 PM #37844
ta, both sets of pads? straight across?1 May 2019 at 10:50 AM #37849
Yes, Please check the image below.6 May 2019 at 1:59 AM #37916
that did the trick, thank you.6 May 2019 at 10:57 AM #37922
Great yo know it helped you
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