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Questions tagged [at-commands]

AT commands are used to control MODEMs, such as GSM/GPRS/bluetooth modules.

21
votes
5answers
8k views

Why do people use AT commands in serial communication?

I need to know why people in embedded systems use AT commands? When I have asked people say that it is a standard. So my question is: What does "AT" means? Why do people keep saying it's a standard?
14
votes
4answers
2k views

Why AT command set?

Frankly, Why do all communication ICs(or at least many of them or most famous or popular) such as Bluetooth or WIFI or GSM or etc support AT command set? why don't they have a simple pin for D/C(Data ...
11
votes
9answers
46k views

What AT command should be sent to modem to get time?

I am using SIM800E. I want to know what AT command should be sent to the modem to get time? This modem has a RTC. But I need to set it automatically through cell tower. The tower can send the time to ...
11
votes
1answer
3k views

AT Commands to transmit data through TCP/IP stack with LTE network

I need to design an embedded sotfware that will drive a LTE cellular device (like u-Blox TOBY L2 Series) and its TCP/IP stack to transmit some data toward a distant server. I'm waiting for the device ...
5
votes
3answers
8k views

Trying to find location in GSM network

I am using a GSM modem by Simcom SIM 800E. I'm interfacing it over the serial link. I am passing command AT+CSCB to get the location. But I am not getting it. I ...
3
votes
2answers
13k views

Posting to php server using SIM900 GPRS with AT commands

I am using a SIMCOM SIM900 GSM/GPRS module in an embedded hardware application. Rather than sending device data to a server by SMS (what I've been doing so far) I want to switch and start using GPRS ...
3
votes
2answers
2k views

SIM card for SIM908 module

I just got this SIM908 dev board, and I'm trying to get it working. However, it keeps telling me "SIM not inserted": AT+CPIN? +CME ERROR: SIM not inserted which ...
3
votes
1answer
13k views

GSM Modem will not register to network

After getting two modems (dev boards) Siemens TC35 and SIM900A I cannot get them to send SMS. From the research it seems that somehow SIM cards will not register to network. I bought three SIM cards ...
3
votes
3answers
29k views

SIM900 Error on AT Command AT+SAPBR=1,1

I intend to send some information through GET method to a php page using the SIM900 module. I tried the following sequence of commands with success. ...
3
votes
1answer
910 views

Establish connection between analog and GSM modem

I want to know if I can call a GSM modem (a SIEMENS MC55) from a normal analog (PSTN) modem. If so, how do I have to configure the GSM and the analog device? I've read about the +FCLASS and +CSNS ...
3
votes
1answer
89 views

What are AT commands ? When to use them?

I read some articles about the AT commands but I am still unable to understand something. As the article says "AT commands are instructions used to control a modem." I used a while ago an Bluetooth ...
3
votes
1answer
453 views

Receiving empty data from gprs module? [closed]

I am trying to send a string from a Huawei MU509 GPRS modem to a Linux server over the internet. I am using an AT command tester to simulate AT commands. After giving the ...
3
votes
2answers
1k views

Using BLE module by blueradios

I want to use the bluradios BLE module. Here is what I am talking about, Another link for the material available on the site. Now, I would like to use AT command set to program the module. The site ...
2
votes
6answers
14k views

HC-05 Bluetooth module not responding to certain commands

I've got a problem with my HC-05 BT module. I'm talking to it from my PC via USB/UART converter. When it's in slave mode I can link it with another device, send data using module's and converter's ...
2
votes
1answer
481 views

is 'Ok' important when sendin AT commands to modem

I'm currently using VHDL to program the FPGA Spartan 3AN Kit-set. The objective is create a programme to send an SMS to a mobile phone, using the Kit-set via the modem. I'm done with the transmit ...
2
votes
1answer
228 views

Signal the MCU using GPRS

I am working on a project with a GPRS and MCU. I am feeding the data to my server via GPRS, it's socket server. I was wondering if there is a way ( AT Command ) to do the reverse, I mean I like to ...
2
votes
1answer
544 views

SIM808 registration denied for new SIMs

I have a SIMCom SIM808 2G GSM module on a custom PCB based upon the Adafruit FONA. I got a bunch of 2G SIM cards from Aeris.net. The problem is when I first put the SIM cards in my device, I get "...
2
votes
1answer
2k views

SIM800 - HTTP Get request time out

I've been working on a weather station project, and I used a SIM 900 module to upload the data to a web server. Recently I started using a SIM800-DS for the same purpose and I had to rewrite the code ...
2
votes
1answer
405 views

How to handle nested final result code in AT-command text?

I am writing a parser (a finite state machine to be more precise) for AT-commands and I don't see how to handle a particular corner case: Here is the specifications of the modem communication: When ...
2
votes
1answer
3k views

Sending Multiple Messages using Sim300 gsm/gprs module

I have interfaced SIM300 Gsm module with lpc2468 through UART. My main motive is to send SMS when some special sequence run. Now my requirement is that I should send the same messages to two numbers. ...
1
vote
2answers
5k views

ESP8266 Wifi Module - prints “ready” but not responding to AT commands

Just received my first ESP8266 wifi module with some excitement. However I've been unable to fully communicate with it. I have connected the module to my computer via a usb to serial cable and I'm ...
1
vote
2answers
3k views

Is it possible to send AT commands through TCP?

I have a SIM900 GSM/GPRS device, I can send AT commands through HyperTerminal and everything is fine. I can configure GPRS connection through AT commands: ...
1
vote
2answers
3k views

sim900 escape character error

I am trying to send some hex data over TCP using SIM900A module. But the sequence of data has a byte with value of 0x1B which is the escape character. As a result the module terminates the command ...
1
vote
3answers
5k views

How to call AT command on XBee from Arduino

I am trying to set the SM (sleep mode) register on the XBee radio. These registers can be set with so called AT Commands, listed from pg. 28 in the XBee/XBee Pro Product Manual. This can be done ...
1
vote
1answer
1k views

AT-Commands: Send E-mail with attachment

I purchased a telit GSM Click (GL865) to use in my project. The architecture is composed of PIC based board with two MikroBUS connectors, I used one for the Telit GSM click, and the second one for the ...
1
vote
2answers
2k views

AT+CSQ without Disconnecting PPP Connection in ARCH Linux

I have a Telit GL865 GSM/GPRS module which is connected to a SBC (running ARCH Linux.) via Serial Port. For GPRS connection, PPP connection as indicaten on this page. I want to read Cell Tower Signal ...
1
vote
1answer
6k views

Is it Possible to receive the phone calls through GSM Modem Interfaced with Computer in Computer?

Actually I am doing a Project. GSM Modem is interfaced with the PC. Remotely a mobile phone will dial to GSM Modem(SIM inserted). Is it possible to receive the voice signal trough the modem to PC? For ...
1
vote
1answer
615 views

Help with GSM Module from Telit GM862

I bought a GM862 module some while ago, I inserted the SIM card and made all the necessary configurations but I always get the: AT+CREG? +CREG: 0,2 response, ...
1
vote
2answers
2k views

GSM/GPRS AT command - hitting a link

I am trying to target a specific page (script) on my webserver using a GPRS modem. I can hit my domain, and get a reply back but then when I am trying to call my script it just won't let me: ...
1
vote
2answers
3k views

Testing a connection to a TCP socket through SIM5320A cellular module

I'm using a SIMCOM 5320A module like this one to try to establish a TCP connection. I'm going through SIMCOM's application note on TCP/IP as a reference. The AT commands I'm using may very well be ...
1
vote
2answers
9k views

HC-05 Bluetooth AT+INQ command not working

I have followed the directions from the site below for bluetooth comm between an Arduino board using the HC-05 and an smartphone. It works fine. The problem is that I need to measure the RSSI from my ...
1
vote
1answer
1k views

AT+CNBP command for SIM5216E cellular module [closed]

I am trying to use the the simcom AT command set to change the preferred band on my "SIM5216E" module. I know I need to use the AT+CNBP command, but I am unsure of what code I need to enter to select ...
1
vote
0answers
28 views

How do you get the call ringing response after sending ATD from gsm module?

I have a gsm module. I want to know which AT command can tell me if the target phone is ringing or not. I want to count time between start of ringing and user response Example: atd12345 ...
1
vote
1answer
102 views

how to send inter-operator sms via GSM/LTE module

I am using a GSM/LTE module (EC21 Quectel) to send and recieve sms with HyperTerminal application on computer by at-commands. I can send sms to devices with the same operator (intra-operator), but ...
1
vote
1answer
6k views

SIM800L not responding to AT commands

I am on a very exciting project, by the SIM800L module is resisting hard ! The hardware : clone arduino nano (dx.com) SIM800L module + antenna (dx.com) Lipo battery 3.7V 150mAh (letmeknow.com) The ...
1
vote
0answers
384 views

Error sending SMS to SIM900 in PIC

I am trying to interface SIM900 with PIC18F2520. I need to send SMS to a particular cell number. According to AT commands, ...
1
vote
1answer
800 views

hlk-m30 WebClient example

I have started working on HLK-m30 WiFi module. I am developing the simple client on the module using simple AT commands. I have Opened socket TCP client and then Write data using the command. ...
0
votes
2answers
471 views

DB9 Serial communication

I am getting some strange character displays on hyper terminal, after establishing communication with my GSM modem using the appropriate baud rate. When I type "AT", it appears to get repeated or ...
0
votes
2answers
2k views

GPRS HTTP 400 Bad request

I am facing some problem with GPRS Project. I am sending request to server through GPRS and receiving responce from the server. I have used AVR ATmega32 micro controller and SIM900 GSM/GPRS Module ...
0
votes
2answers
174 views

SIM808 always returns the same temperature

I have a SIMCom SIM808 module built up on my own breakout board. Whenever I query the temperature I get back the exact same temperature, 24.11 (deg C) despite the actual temperature in the room ...
0
votes
1answer
160 views

SIM900 SMS timestamps are not accurate enough

I'm experimenting a bit with a SIM900 module and a Raspberry Pi. I can communicate with it and receive/send SMS messages. However, there's a problem when a message that exceeds the 160 character limit ...
0
votes
4answers
6k views

How to Make Sure SIM900 modem will always give me +PSSUTTZ string?

I am using SIM 900 modem to enable GSM connection wirh my product. Micro-controller Communicates with SIM900 modem through a SET AT commands over UART. My product is time critical and i need to have ...
0
votes
1answer
3k views

How do I send data over TCP from a SIM5320A?

NOTE: I have been using this as a reference. After recently purchasing a SIM5320A breakout board (the board) I have been trying to connect it to a TCP server. After having to connect the board to an ...
0
votes
1answer
4k views

What does the GSM AT+CSQ command output signify?

So the command returns the received signal strength(RSSI) and bit error rate(BER). I see that the RSSI is obtained even if the SIM card is not inserted in the GSM module. So what does RSSI signify? ...
0
votes
1answer
714 views

GPRS modem gets stuck/hangs up when “AT” is entered

I started working on a U-blox LEON-G100 gprs modem connected to the PC terminal through UART. Whatever character I enter into the terminal gets echoed back except "AT". When I enter "AT", the modem ...
0
votes
1answer
597 views

UART - Writing and reading AT commands

I am working with a B-L072Z-LRWAN1 board and a 8pya00-simcom-evb v1.02 board with SIM7000E. This SIM module operates through AT commands and I need to send these commands through an UART connected ...
0
votes
1answer
98 views

How can I read/write bytes to SD card slot of MC60A?

I am working on a clickBoard with MC60 A GSM module from MikroEletronika company. This clickBoard has two slots: (1) one for SIM card and another (2) for micro SD cards. I have read all the available ...
0
votes
2answers
271 views

Fetching network time from simcon 800c gsm module [closed]

Is there any way to fetch the current time from the 800c GSM module. I tried the following commands: AT+CENG=2 AT+CLTS=1 AT+CCLK? Output: ...
0
votes
1answer
234 views

How to use hc-05 with pic32

I want to use Hc-05 bluetooth module with my pic32 controller for communicating with other bluetooth devices. I want to test the hc-05 module with my pic32 controller. I have made the hardware ...
0
votes
2answers
583 views

AT commands for GSM

I'am trying to interface a GSM module with flowcode for PIC and the Tutorial I'am following suggests a module SmartGM862 which is not available in my market but instead some other SIM900 series module ...