Can anyone tell me how AT commands are implemented in mobile phones?
I need a advanced description.
There are some commands which interface through the keypad and those which bypass the keyboard to the modem.
For example AT+CKPD is being supported by Sony Ericsson & Siemens(no AT+CPIN support).It interfaces with the keyboard before reaching modem.
I want to write an application which will run on my PC and communicate to a mobile phone using AT commands.
Can this be made generic?
So how exactly is the design?
I require urgent help......:(
Moreover can cell phone display be captured using AT commands and checksum comparison done?
If so how?
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HI.........
i want to know how the AT command communicate withthe mobile.
The implementation side u see.........
how it talks to the mobile...and how mobile understands it & executes it.
so as u say....display annot be read using At command.Thanx for the i/p.
There are applicatuions which can capture LCD display of mobile phones .How r they implemented?any idea?
>> i want to know how the AT command communicate withthe mobile.
That sentence doesn't make much sense.
>> The implementation side u see.........
This a bit more though. Problem is, it depends on the mobiles. Let's take examples, it will be easier I hope :
- Case of a Siemens TC35, a GSM modem (not a phone)
(PC (your software)--(kernel serial port driver)--(16xxx on-board chip))
|
+--> (RS 232 cable)
|
+--> ((16xxx chip)--(AT parser)--(internal execution mechanism)-- GSM modem)
So, the parser for the commands you're sending from the PC is in the modem.
- Case of a Nokia phone with an infrared-interface
(PC (your software)--(virtual serial port driver created by Data Suite))
|
+--> (Nokia AT parser included in the Data Suite software)
|
+--> (commands translated into Nokia "dialect")
|
+--> (infrared interface)
|
+--> (command executed in the mobile phone)
Here, the AT parser is running in the PC, not in the equipment.
>> There are applicatuions which can capture LCD display of mobile phones .How r they implemented?any idea?
It must be using manufacturer specific APIs/interfaces/protocols,
hi........
i'll tell u what i am trying to do.........:)
i am trying to analyse if i can write a tool which uses AT commands.....which can help me to test mobile phones.
This tool has to be generic.........scripts once written should run on any phone..nokia,sony ericsson,siemens etc.No need to modify scripts/tool.
moreover i want to automate my testing in such a way that i generate keypresses & simulate user interacions.
The problem i face is that AT+CKPD is not implemented in all phones.
i studied the implementation of these...found that sony ericsson and siemens support AT+CKPD
Moreover most commands directly interact with the modem in the mobile phone and not through the keypad.
My scripts can contain some wrapper commands...which can be mapped to vendor specific At commands.
But how to solve the problem of AT commands not interfacing with the keypad?
Can you provide more light on this?
Although I believe that the asker's problem cannot be solved (a GSM modem is NOT required to have any kind of keypad or display, and consequently, the AT command set is NOT supposed to interact with these devices, even if a couple commands have been proposed and defined by the standards), I guess that a delete/refund is in order here.
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by: _nn_Posted on 2003-09-29 at 04:59:45ID: 9450642
>> I want to write an application which will run on my PC and communicate to a mobile phone using AT commands.
>> Can this be made generic?
Yes.
>> So how exactly is the design?
GSM AT commands normally follow this guidelines :
Test command
AT+CXXX=? The mobile equipment returns the list of parameters and value ranges set with the corresponding Write command or by internal processes.
Read command
AT+CXXX? This command returns the currently set value of the parameter or parameters
Write command
AT+CXXX=<...> This command sets user-definable parameter values.
So, you should just need to test if the command is available before using it, that's all.
>> Moreover can cell phone display be captured using AT commands
As far as I know, no.
>> and checksum comparison done?
I don't understand, please be more specific, what are you talking about ?