SIM900A GSM GPRS Module with RS232 Interface and SMA Antenna Documentation

Component Name

SIM900A GSM GPRS Module with RS232 Interface and SMA Antenna

Overview

The SIM900A GSM GPRS Module is a compact, wireless communication module designed to enable cellular connectivity in a wide range of IoT applications. With its RS232 interface and SMA antenna, this module provides a versatile and reliable solution for transmitting data over GSM/GPRS networks.

Functionality

The SIM900A module is a quad-band GSM/GPRS module, operating at frequencies of 850/900/1800/1900 MHz. It supports GPRS class 10, with a maximum data transfer rate of 85.6 kbps. The module's primary function is to enable wireless communication between devices and cellular networks, allowing for the transmission of data, voice, and SMS.

Key Features

Quad-Band GSM/GPRS Support: The module operates on four frequency bands, ensuring global compatibility and roaming capabilities.
RS232 Interface: The module features an RS232 interface for easy communication with microcontrollers, computers, and other devices.
SMA Antenna: The module comes with an integrated SMA antenna, providing a compact and reliable solution for wireless communication.
GPRS Class 10: Supports high-speed data transfer rates of up to 85.6 kbps.
SMS and Voice Support: Enables the transmission and reception of SMS and voice calls.
TCP/IP Stack: The module has a built-in TCP/IP stack, supporting a range of IP-based protocols, including HTTP, FTP, and SMTP.
AT Command Set: Supports the AT command set, allowing for easy configuration and control of the module.
Power Supply: Operates on a supply voltage of 3.2-4.8 V, with a typical current consumption of 30 mA in standby mode.
Small Form Factor: Measuring 24 x 24 x 3 mm, the module is compact and lightweight, making it suitable for integration into a variety of devices.
Industrial Temperature Range: Operating temperature range of -40C to +85C, ensuring reliable operation in harsh environments.

Applications

M2M (Machine-to-Machine) Applications: Ideal for remote monitoring, tracking, and control systems.
Industrial Automation: Suitable for industrial automation, process control, and monitoring systems.
Wireless Sensor Networks: Enables wireless communication between sensors and gateways in sensor networks.
Telemetry Systems: Ideal for remote data collection and transmission in telemetry systems.
Smart Home and Building Automation: Enables wireless communication in smart home and building automation systems.

Interfaces and Pinouts

The SIM900A module has the following interfaces and pinouts
RS232 Interface

+ TX (Transmit)

+ RX (Receive)

+ GND (Ground)

Power Supply

+ VCC (Supply Voltage)

+ GND (Ground)

Antenna Interface

+ SMA (Antenna Connector)

Certifications and Compliance

The SIM900A module complies with the following certifications and regulations

CE (Conformit Europene)

FCC (Federal Communications Commission)

RoHS (Restriction of Hazardous Substances)

REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals)

Documentation and Resources

Datasheet

User Manual

AT Command Set Documentation

SDK (Software Development Kit) and API (Application Programming Interface) documentation

Ordering Information

The SIM900A GSM GPRS Module with RS232 Interface and SMA Antenna is available for purchase through authorized distributors and online marketplaces. Please contact the manufacturer or supplier for pricing and availability information.

Pin Configuration

SIM900A GSM GPRS Module with RS232 Interface and SMA Antenna: Pinout Explanation and Connection Guide
The SIM900A GSM GPRS module is a popular IoT component used for cellular communication in various applications. This module features an RS232 interface for serial communication and an SMA antenna for wireless connectivity. In this documentation, we will provide a detailed explanation of each pin on the module, along with a comprehensive connection guide.
Pinout Structure:
The SIM900A module has a total of 24 pins, arranged in two rows of 12 pins each. The pinout is as follows:
Row 1:
1. VCC (Power Supply, 3.5V to 4.5V): This pin is used to power the module. A voltage regulator or a power source within the specified range should be connected to this pin.
2. GND (Ground): This pin is the ground reference point for the module. Connect it to the ground of your circuit or system.
3. RXD (Receive Data, TTL Level): This pin is used for receiving serial data from the module. It should be connected to the TXD pin of your microcontroller or serial device.
4. TXD (Transmit Data, TTL Level): This pin is used for transmitting serial data to the module. It should be connected to the RXD pin of your microcontroller or serial device.
5. RTS (Request to Send, TTL Level): This pin is used for flow control in serial communication. It should be connected to the CTS pin of your microcontroller or serial device.
6. CTS (Clear to Send, TTL Level): This pin is used for flow control in serial communication. It should be connected to the RTS pin of your microcontroller or serial device.
7. DTR (Data Terminal Ready, TTL Level): This pin is used to indicate that the module is ready to transmit data. It can be connected to the DSR pin of your microcontroller or serial device.
8. DSR (Data Set Ready, TTL Level): This pin is used to indicate that the module is ready to receive data. It can be connected to the DTR pin of your microcontroller or serial device.
9. DCD (Data Carrier Detect, TTL Level): This pin is used to indicate the presence of a carrier signal. It can be connected to the DCD pin of your microcontroller or serial device.
10. RI (Ring Indicator, TTL Level): This pin is used to indicate incoming calls or messages. It can be connected to the RI pin of your microcontroller or serial device.
11. MIC+ (Microphone Positive): This pin is used for connecting the positive lead of an external microphone.
12. MIC- (Microphone Negative): This pin is used for connecting the negative lead of an external microphone.
Row 2:
1. VIO (I/O Voltage, 1.8V or 2.8V): This pin is used to set the I/O voltage level of the module. It should be connected to a voltage source or a voltage regulator.
2. SIM_VCC (SIM Card Power, 1.8V or 3.0V): This pin is used to power the SIM card. It should be connected to a voltage source or a voltage regulator.
3. RST (Reset, Active Low): This pin is used to reset the module. A low-level signal (0V) should be applied to this pin to reset the module.
4. PWRKEY (Power Key, Active Low): This pin is used to turn the module on or off. A low-level signal (0V) should be applied to this pin to turn the module on.
5. GPIO1 (General Purpose Input/Output 1): This pin can be used as a general-purpose input or output under software control.
6. GPIO2 (General Purpose Input/Output 2): This pin can be used as a general-purpose input or output under software control.
7. GPIO3 (General Purpose Input/Output 3): This pin can be used as a general-purpose input or output under software control.
8. GPIO4 (General Purpose Input/Output 4): This pin can be used as a general-purpose input or output under software control.
9. SMA (SMA Antenna Connector): This is the antenna connector for the module's GSM/GPRS functionality.
10. NETLIGHT (Network Status Indicator): This pin is used to indicate the network status of the module.
11. STAT (Status Indicator): This pin is used to indicate the status of the module.
12. Shield (Shield Ground): This pin is used to connect the shield of the SMA antenna connector to the ground of the module.
Connection Guide:
1. Power Connection:
Connect the VCC pin to a power source or a voltage regulator within the specified range (3.5V to 4.5V).
Connect the GND pin to the ground of your circuit or system.
2. Serial Communication:
Connect the RXD pin to the TXD pin of your microcontroller or serial device.
Connect the TXD pin to the RXD pin of your microcontroller or serial device.
Connect the RTS pin to the CTS pin of your microcontroller or serial device.
Connect the CTS pin to the RTS pin of your microcontroller or serial device.
3. Audio Connection:
Connect the MIC+ pin to the positive lead of an external microphone.
Connect the MIC- pin to the negative lead of an external microphone.
4. SIM Card Connection:
Insert a valid SIM card into the SIM card slot on the module.
Connect the SIM_VCC pin to a voltage source or a voltage regulator within the specified range (1.8V or 3.0V).
5. Antenna Connection:
Connect the SMA pin to an SMA antenna for wireless connectivity.
6. GPIO Connection:
Use the GPIO pins (GPIO1 to GPIO4) as general-purpose inputs or outputs under software control.
7. Reset and Power Key:
Connect the RST pin to a low-level signal (0V) to reset the module.
Connect the PWRKEY pin to a low-level signal (0V) to turn the module on.
Note: Ensure that all connections are made according to the recommended voltage levels and signal directions to avoid damaging the module or other components in your circuit. Additionally, consult the module's datasheet and relevant documentation for more detailed information on pinouts, connections, and usage guidelines.

Code Examples

SIM900A GSM GPRS Module with RS232 Interface and SMA Antenna Documentation

Overview

The SIM900A GSM GPRS Module is a compact, quad-band GSM/GPRS module designed for a wide range of IoT applications. It features an RS232 interface for easy integration with microcontrollers and other devices. The module also comes with an SMA antenna connector for efficient cellular connectivity.

Technical Specifications

Quad-band GSM/GPRS support (850/900/1800/1900 MHz)
 RS232 interface for serial communication
 SMA antenna connector for external antenna
 Power supply: 5V-12V DC
 Operating temperature: -40C to +85C
 Dimensions: 24mm x 24mm x 3mm

Code Examples

### Example 1: Sending SMS using Arduino Uno

In this example, we will demonstrate how to use the SIM900A module to send an SMS using an Arduino Uno board.

Hardware Requirements

SIM900A GSM GPRS Module
 Arduino Uno board
 Breadboard and jumper wires
 Power supply (5V-12V DC)

Software Requirements

Arduino IDE (version 1.8.x or later)

Code
```c
#include <SoftwareSerial.h>

// Define the serial pins for the SIM900A module
#define TX_PIN 10
#define RX_PIN 11

// Create a software serial object for the SIM900A module
SoftwareSerial sim900a(TX_PIN, RX_PIN);

void setup() {
  // Initialize the serial console
  Serial.begin(9600);

// Initialize the SIM900A module
  sim900a.begin(9600);
}

void loop() {
  // Check if the SIM900A module is ready
  while (!sim900a.available()) {
    delay(1000);
    Serial.println("Waiting for SIM900A module...");
  }

// Send an SMS using the SIM900A module
  sim900a.print("AT+CMGF=1
"); // Set the SMS mode to text mode
  delay(1000);
  sim900a.print("AT+CMGS=""+1234567890""
"); // Set the recipient's phone number
  delay(1000);
  sim900a.print("Hello from Arduino!"); // Send the SMS message
  delay(1000);
  sim900a.print(char(26)); // Send the SMS confirmation character
  delay(1000);

Serial.println("SMS sent successfully!");
  delay(5000);
}
```
### Example 2: Making a HTTP GET Request using Raspberry Pi (Python)

In this example, we will demonstrate how to use the SIM900A module to make an HTTP GET request using a Raspberry Pi board and Python.

Hardware Requirements

SIM900A GSM GPRS Module
 Raspberry Pi board
 Breadboard and jumper wires
 Power supply (5V-12V DC)

Software Requirements

Raspbian OS (version 10 or later)
 Python 3.x

Code
```python
import serial
import time

# Define the serial port for the SIM900A module
ser = serial.Serial('/dev/ttyUSB0', 9600, timeout=1)

# Define the APN settings for the cellular network
apn = "your_apn"
username = "your_username"
password = "your_password"

# Set the APN settings
ser.write(b'AT+CGDCONT=1,""IP"

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