OrangePi 2G-IOT cellular modem problem

danoz

Hi,

I have Ubuntu image downloaded from the site
"OrangePi_2G-IOT_Ubuntu_GSM_Package.rar "


I have tested the cellular modem using the picocom app, and also by writing python script (using pySerial commands).
when I send the AT command "AT+CSQ=?" to the cellular modem, it returns 20,99. first value varies between 17-25, but the second value is always 99 - that means that the RXQUAL is not detecatble.
I see that the modem is not registered to the network.
I did't succeed sending messages, strat calls etc.

I must admit I managed to send SMS and make a call only 2 times with the picocom app, but most of the time it fails and returns CME error:58 I think.

*tried with differe OrangePi 2G-IOT board - same probelm
* tried with different SIM - same probelm
* checked the SIM card volatge, it is 1.8V steady
* tried in different rooms - same probelm (I don't think it is signal power reception problem)

maybe it is a FW problem?
please help...
Dan

Reinhard

To use the cellular modem, you must activate it with the command at +cfun=1

1. at +cfun=1 [ENTER]
   
2. 
   
3. OK
   
4. +CTZV:17/7/22,16:30:10,8
   
5. +CIEV: service,  1
   
6. +CIEV: roam, 0
   
7. +CREG: 1

Copy code

See http://www.orangepi.org/orangepi ... 31&highlight=2g-iot
or http://ec.hobbykompetenz.de/index.php/2017/05/26/gprs-modem-test-orange-pi-2g-iot/
The second quality value is determined only with an active connection. In standby mode the value is always 99.

Very important for sms communication is to use the correct service center

1. at +CSCA="49xxxxxxxxx" [ENTER]

Copy code

Change the value "49xxxxxxxxxx"  with the SMS service center phone number of your provider

cmrahman

I am not able to get any output from TTL with putty set for 115200 baud rate.  Any idea? Do i need to do anything to the dip switch?

Reinhard

cmrahman replied at 2017-7-23 22:16
I am not able to get any output from TTL with putty set for 115200 baud rate.  Any idea? Do i need t ...

You already see nothing during booting?
Also no hieroglyphs? Then check the function of your USB to TTL adapter.Note: Some distributions use baud rate 921600.
The DIP switches are used to assign the USB ports and have no influence on the serial data transfer.

cmrahman

I have replaced the USB to TTL. I am using 921600 and I am able to get some garbage but I am not able to boot. I am using sandisk 8 gig.  Any other hint?

crossmax

cmrahman replied at 2017-8-14 12:50
I have replaced the USB to TTL. I am using 921600 and I am able to get some garbage but I am not abl ...

Don't you get any clarify message from serial port?
The OrangePi 2G is very special (for not say other uncool word) with microSD. If you can, test with othr microSD.

mkgokp7s

cmrahman replied at 2017-8-14 12:50
I have replaced the USB to TTL. I am using 921600 and I am able to get some garbage but I am not abl ...

Have you tried using a CR2102 chip based Adapter USB->UART?
This is the only one working on my IoT-2G not CH340 and not PL2303

daviddavid

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