Huawei Mg323 UART Interface

What do you use as a host?
Is it possible that you send extra characters after the AT command?

You have to send only AT<CR> because any other character after the CR typically stops the executon of previous command

Thanks for the answer!

I use a computer under Gnu/Linux, with GTKterm in hexadecimal mode.

So I can check precisely what is sent that is: "41 54 0D" What is <CR> is it 0D?

Hi

Yes OD is the hex representation of the <CR> (Carriage return) character

I searched for mg323 on the web, and I found out this code refers to an SOC. What is the code of the board the Mg323-b is soldered on?

Ps: My current config is 115200-8-N-1, but i've tried many without success.

What default config should be used to talk to the module the first time?

Custom Board.

Though I seem to have followed all specifications given in hardware design guide. (I'm used to design way more complex boards.)

You mean you built the board? Do you have a schematic?

I look quickly through the datasheet.

UART0 is for debug, so it's correct you get nothing

UART1 is the interface to use. It supports variable baudrate. The default is 115200,0dd,8,1

Take a look here for more details

http://download-c.huawei.com/download/downloadCenter?downloadId=14153

Thanks for the info and the document concerning default values. Though in the document they seem to say that default is 8 bits data, 1 bit stop, no parity.

Here is the schematic I used

I connected a battery Beetween P2.1 and P2.5, a pushbutton between P2.4 and P2.5 to power it on, and a led between P6.1 and ground which blinks at 1 hz when I power the module on, which is normal.

Concerning UART0 do you mean that in order to use it, it must be activated softwarly trhough UART1 before?

A problem that I could have is that my FT230X AUART To USB converter does not support DTR/DSR. On top of that I've noticed that if I let them unplugged, DTR is up (probably a pull up resistor), But DSR is low! Should it mean the module is not ready to communicate?

[EDIT] I also Connected a 200UF capacitor between VCoin and ground.

I feel a litlle bit shamefull about it, but I just noticed that There was an obvious soldering problem on TX. Sorry for bothering you.

Though I still have something strange: the modules keeps sending the same thing over and over again. I don't know if it is normal.

Don't worry! you are always welcome and I'm happy you worked out this issue!

What is the module sending out?

Yes Thank you.

Now everything is working fine (I had a last little solder bridge).