Interface Siemens A50 with Microc.

• Feb 11, 2004

• #1

G

gorkin

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siemens a50 at commands

Hi brothers!
I have a cellular A50 Siemens and would like interface with any microcontroller for sending SMS messages and data.
Would be possible some colleague to send such information or same one link so that it can search?

Thanks a lot, Gorkin! :wink:

 

• Feb 12, 2004

• #2

C

C-Man

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siemens a50 at command

Hello Gorkin,

if your microcontroller runs on 3.3V you can interface the ports directly to the A50.

If you are operating at 5V you need some kind of "interface" (a simple level converter).

If you need a level converter I can post a self made design later today when I am at work.

best regards

 

• Feb 12, 2004

• #3

G

gorkin

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interface siemens

Hi C-MAN!
Thanks for reply-me, but I have more question about the interface like:
- My microcontroller can by powered with 3.3 or 5V
- I need the schematic of the interface with pin description of the A50 serial connector.
- My application is for remote monitoring, then I need the list of the AT commands and explanation about the SMS.

In past, I see the link in german site, but I am lost the link...


It´s possible Your help-me?
Thanks a lot, Gorkin

 

• Feb 12, 2004

• #4

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C-Man

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siemens a50

OK I understand.

You should look here (sorry in German):

http://www.nobbi.com/steck_s25.htm
http://www.nobbi.com/phones.htm
**broken link removed**

and here:
**broken link removed**
**broken link removed**
**broken link removed**

But as far as I know you can not send SMS with A50 using the connector (i tried it myself).

This phone has no modem built in :-(

If you want to send SMS you will have to use one of these Siemens phones:
C35, M35, S35, C45, S45, ME45, SL45(i), C55, S55, M50, MT50

hope this helps

 

• Feb 12, 2004

• #5

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gorkin

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siemens a50 comandos at

Ok C-MAN! But with A50 I can send digital data like a modem?
Thanks, gorkin

 

• Feb 12, 2004

• #6

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C-Man

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a50 siemens at commands

You can send voice data using mic-in and speaker out on the connector but this is not the same as using a modem because it works via the sound channels and not via the data channels.

It is much easier to use one of the Siemens phones I mentioned above because they have a built in modem and accept standard AT commands.

best regards

 

• Feb 22, 2004

• #7

fireplus

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at command a50

dear c-man ,

how are you ?

please i want to ask about nokia 6150 if it has a built in modem or not

i was try with it via the serial port by sending at <cr>-->enter
but there was no responce if you know any thing about this please help


could you please to tell me how can i use a mu of 5v with 3v devices ?
[hr:ff9c9364fc]


Fire in the Wire :sm2:

 

• Feb 22, 2004

• #8

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C-Man

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eboard sms

Sorry I do not know much about Nokia phones as I only use Siemens phones.

But as far as I know most Nokias have an Fbus and an Mbus connection and I believe they use a propriatory protocol which is generated from their driver software in the PC.

If you have to interface a 3.3V phone to 5V RS232 you will have to use a level converter like the one I have attached.

Using Google I found this link for you
https://www.gnokii.org/download/

I also attached a little bit of knowledge about the nokia protocols extracted from above link.

hope this helps and best regards

 

• Feb 28, 2004

• #9

fireplus

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siemens a50 pin

dear c man ,

how are you ?
thanks for uesful information

the interface" (a simple level converter) you upload befor
not complete( the wire which connect the lm393(ic6a)(4),22k resistor ,100nf (c3) together )

could you please upload it again

anthoer q? want to ask if Siemens c25 have gsm modem or not ?

thank you


Fire in the Wire :sm2:

 

• Feb 29, 2004

• #10

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connector serial siemens a50

Oooops sorry the GND must also be connected to the Siemens connector pin 1 (power GND) and pin 7 and pin8 (both indicate that accessories are present in our case RS232 and headset).

As far as I know the S25 has no modem built in (or at least does not understand AT commands like the other Siemens phones). I had no luck using it.

best regards

 

• Mar 9, 2005

• #11

G

gorkin

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pdu siemens c35 c55 m35

What difference between the C35 and C35i mobile phones? I can send sms and use data calls for boths?

Thanks a lot guyes!
Gorkin.

 

• Mar 10, 2005

• #12

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C-Man

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interfaceamento celular microfone 100nf

gorkin said:

What difference between the C35 and C35i mobile phones? I can send sms and use data calls for boths?

Thanks a lot guyes!
Gorkin.

Click to expand...

Yes you can send SMS with both (using PDU format)

If I remeber correctly the C35i has internet functionality built in??

best regards

 

• Mar 10, 2005

• #13

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irfansyah

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at command siemens a50

Wait, i want to confirm here. Is it compulsory to use 3 volts to communicate with the phone? Or is it okay to use 5 volts, coz i see the schematics (previous post) use 5 volts.

So? Is it fine to use 5 volts? And can the usual 5 volt MAX232 accept 3v logic level from the phone?

Please do not double post

See my answer here:


C-Man

 

• May 14, 2007

• #14

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at commands for siemens a50

maybe u can use this

 

• May 14, 2007

• #15

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C-Man

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at command+a50

@suriadin01

what sense does it make to answer a 2 years old thread??

 

• Sep 25, 2007

• #16

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anhtam

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c35 c45 c55 rs-232

Can you give me schematic "interface Nokia 6610 to MCU"
Thanks!