www.rhydolabz.com
SIM900 GSM/GPRS TTL UART Modem - User Manual
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GSM/GPRS TTL -Modem from rhydoLABZ is built with SIM C OM M ake S IM 900 Quad-band
GSM/GPRS engine, works on frequencies 850 MHz, 900 MHz, 1800 MHz and 1900 MHz. It is very
compact in size and easy to use as plug in GSM Modem. The Modem is designed with 3V3/5V TTL
interfacing circuitry, which allows you to directly interface to 5V microcontrollers( PIC,Arduino,AVR ect)
as well as 3V3 Microcontrollers ( ARM,ARM Cortex XX, ect) .The baud rate can be configurable from
9600-115200 through AT command. Initially Modem is in Autobaud mode. This GSM/GPRS TTL Modem is
having internal TCP/IP stack to enable you to connect with internet via GPRS. It is suitable for SMS as
well as DATA transfer application in M2M interface.
The modem needed only two wires (Tx,Rx) except Power supply to interface with
microcontroller/Host. The built in Low Dropout Linear voltage regulator allows you to connect wide range of
unregulated power supply (4.2V -13V). Yes, 5 V is in between !! .Using this modem, you will be able to send
& Read SMS, connect to internet via GPRS through simple AT commands.
FEATURES
High Quality Product (Not hobby grade)
Quad-Band GSM/GPRS
850/ 900/ 1800/ 1900 MHz
3V3 or 5V interface for direct
communication with MCU kit
Configurable baud rate
SMA connector with GSM L Type
Antenna.
Built in SIM Card holder.
Built in Network Status LED
Inbuilt Powerful TCP/IP protocol stack
for internet data transfer over GPRS.
Audio interface Connector
Most Status & Controlling Pins are
available at Connector
Normal operation temperature: -20 °C to
+55 °C
Input Voltage: 5V-12V DC
SPECIFICATIONS
Quad-Band 850/ 900/ 1800/ 1900 MHz
GPRS multi-slot class 10/8
GPRS mobile station class B
Compliant to GSM phase 2/2+
o
Class 4 (2 W @850/ 900 MHz)
o
Class 1 (1 W @ 1800/1900MHz)
Dimensions: 24*24*3mm
Weight: 3.4g
Control via AT commands (GSM 07.07
,07.05 and SIMCOM enhanced AT Commands)
Low power consumption: 1.0mA(sleep
mode)
Operation temperature: -40°C to +85 °C\
Specifications for Fax
Group 3, class 1
Specifications for Data
GPRS class 10: max. 85.6 kbps (downlink)
PBCCH support
Coding schemes CS 1, 2, 3, 4
CSD up to 14.4 kbps
USSD
Non transparent mode
PPP-stack
Specifications for SMS via GSM/GPRS
Point to point MO and MT
SMS cell broadcast
Text and PDU mode
Software features
0710 MUX protocol
embedded TCP/UDP protocol
FTP/HTTP
Special firmware
FOTA
MMS
