Rhydo SIM 900 SIM 900 -TTL UART User manual

www.rhydolabz.com SIM900 GSM/GPRS TTL UART Modem - User Man al

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Page 1

Document :

Model

–

1936

Date :

DEC

-2011

SIM 900

SIM 900 SIM 900

SIM 900 -

-TTL

TTL TTL

TTL

UART

UARTUART

UART

SM/G

M/GM/G

M/GP

PRS

RSRS

User

Manua

Rhydo Technologies (P) Ltd.

(An ISO 9001:2008 Certified R&D

Company)

Golden Plaza, Chitoor Road,

Cochin – 6 201 , Kerala State, India

Phone : 0091- 4 4-2370444, 2371666

Cell : 0091- 99466 70444

Fa : 0091 - 4 4-2370579

E-mail : info@rhydolabz.com, sales@rhydolabz.com

WebSite : http://www.rhydolabz.com

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Page 2

GSM/GPRS TTL -Modem from rhydoLABZ is built with SIMC OM Make SIM900 Quad-band

GSM/GPRS engine, works on frequencies 50 MHz, 900 MHz, 1 00 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

50/ 900/ 1 00/ 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 50/ 900/ 1 00/ 1900 MHz

 GPRS multi-slot class 10/

 GPRS mobile station class B

 Compliant to GSM phase 2/2+

o Class 4 (2 W @ 50/ 900 MHz)

o Class 1 (1 W @ 1 00/1900MHz)

 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 + 5 °C\

Specifications for Fa

 Group 3, class 1

Specifications for Data

 GPRS class 10: max. 5.6 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

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 Java (cooperate with Iasolution)

 Embedded AT

Specifications for Voice

 Tricodec

o Half rate (HR)

o Full rate (FR)

o Enhanced Full rate (EFR)

 Hands-free operation

 (Echo suppression)

 AMR

o Half rate (HR)

o Full rate (FR)

Interfaces

 Analog audio interface

 Serial interface

 SMA Antenna Connector

 Seriel Port Pins (RXD,TXD) at 2mm Pitch

RMC

 Seriel Port Status and Controlling Pins at

2mm Pitch RMC

 DC Power pins at 2mm Pitch RMC

Compatibility

 AT cellular command interface

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DIMENSIONS

OPERATING CONDITIONS

IN/OUT

Supply Voltage -

VIN

Input 4.2 13 V

Current

Consumption

--- 40 590 mA

V_Inter ace Input 2.5 6 V

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PIN DESCRIPTIONS

PIN NAME

DIR

DETAILS

VIN Power Supply PWR

Power Supply Input (4.2-13V DC,1A)

GND Ground PWR

Ground Level o Power Supply

Inter ace

Inter acing

Voltage PWR

Inter acing Voltage Input or on board voltage level conversion (3V3 or 5V).

I the modem has to be inter aced with a 5V microcontroller, the input to this pin

should be 5V DC and i the modem has to be inter aced with a 3V3 microcontroller,

the input to this pin should be 3.3V DC.

TXD Transmit OUT Outputs data bytes at voltage Level same as the V_Inter ace Pin

– Usually connected to the Rx pin o the microcontroller

RXD Receive IN Receives data bytes at voltage Level same as the V_Inter ace Pin

– Usually connected to the TX pin o the microcontroller

GND Ground PWR

Ground Level o Inter acing Signals

/RESET Reset Input IN

Active low Reset pin to reset the modem , Pull down this pin to reset the modem using a

open collector output or switch- Normally leave open

-No on board level Conversion

RTS Request to

send IN Used For hardware low control. I needed ,can be shorted with CTS using J1 at bottom

side, in de ault le t open—With on board level Conversion

CTS Clear to send OUT Used For hardware low control. I needed , can be shorted with RTS using J1 at

bottom side, in de ault le t open-—With on board level Conversion

PWRKEY Power Key IN Pin or MODEM On/O externally using open collector transistor or Switch.

-No on board level Conversion

NETLIGHT Net Led OUT Open Collector output or connecting the Connection status LED externally

-Use 1k ohm resistor in series with LED

STS Status LED OUT Open Collector output or connecting the Status LED externally

-Use 1k ohm resistor in series with LED

RI Ring indicator OUT Pin to interrupt the Host / Microcontroller to indicate Call, SMS, Error ect.

-No on board level Conversion

DTR Data Terminal

Ready IN Input pin used to switch the modem to and rom the command mode

- Normally leave open

-—

With on board level Conversion

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OPERATING MODES

The table below briefly summarizes the various operating modes referred to in the following chapters.

Mode Function

Normal

operation

GSM/GPRS

S EEP

Modem

will automatically go into S EEP m

ode if DTR is set to high level

and there is no on air and no hardware interrupt (such as data on serial

port). In this case, the current consumption of GSM Modem will reduce to

the minimal evel.

In S EEP mode, the Modem can still receive paging message and SMS from

the system normally.

GSM IDLE

Software is active.

Modem

has registe

red to the GSM networ , and the

modem is ready to send and receive.

GSM TALK

Connection between two subscribers is in pr

ogress. In this case, the

power consumption depends on networ settings such as DTX off/on,

FR/EFR/HR, hopping sequences, antenna.

GPRS

STANDBY

Modem

is ready for GPRS data transfer, b

ut no data is currently sent or

received. In this case, power consumption depends on networ settings

and GPRS configuration.

GPRS DATA

There is GPRS data transfer (PPP or TCP or

UDP) in progress. In this

case,power consumption is related with networ settings (e.g. power

controllevel), uplin / downlin data rates and GPRS configuration (e.g.

used multi-slot settings).

POWER

DOWN

Normal shutdown by sending the “AT+CPOWD=1”

command or using the PWRKEY. The

power management ASIC disconnects the power supply from the baseband part of the

GSM Modem. Software is not active. The serial port is not accessible. Operating voltage

remains applied to the internal circuitry

Minimum

functionality

mode

(withoutremove

power

supply)

Use the “AT+CFUN” command can set the modem to a minimum functionality mode

without remove the power supply. In this case, the RF part of the modem will not wor

or the SIM card will not be accessible, or both RF part and SIM card will be closed, and

the serial port is still accessible. The power consumption in this case is very low.

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1.1 Turn on GSM Modem Using the PWRKEY Pin (Power on)

You can turn on the Modem by driving the PWRKEY to a low level voltage for a short time (2-3 sec) and then

release. This pin has pulled up to 2.9V in the GSM Modem. The simple circuit illustrates as the following figures.

1K PWRKEY

4.7K

BC547B

Turn on impulse

47K

Fig 6: Turn on GSM Modem using Open collector circuit

1.2 Turn Off GSM Modem

Following ways can be used to turn off the GSM Modem:

• Normal power down procedure: Turn off GSM Modem using the PWRKEY pin

• Normal power down procedure: Turn off GSM Modem using AT command

• Over-voltage or under-voltage automatic shutdown: Take effect if over-voltage or under-voltage is

detected

• Over-temperature or under-temperature automatic shutdown: Take effect if over-temperature or

under-temperature is detected

1.2.1 Turn Off GSM Modem Using the PWRKEY Pin (Power down)

You can turn off the GSM Modem by driving the PWRKEY to a low level voltage for a short time (2-3 sec) and then

release. Please refer to the turn on circuit above.

The power down scenario illustrates as following fig: 8.This procedure lets the modem log off from the network

and allows the software to enter into a secure state and save data before completely disconnecting the power

supply.Before the completion of the switching off procedure the GSM Modem will send out result code:

“NORMA POWER DOWN”

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After this moment, the AT commands can’t be executed. The modem enters the POWER DOWN mode. POWER

DOWN can also be indicated by STATUS pin, which is a low level voltage in this mode.

1.3 Turn Off GSM Modem Using AT Command

You can use the AT command “AT+CPOWD=1” to turn off the modem. This command lets the GSM Modem log off

from the network and allows the GSM Modem to enter into a secure state and save data before completely

disconnecting the power supply. Before the completion of the switching off procedure the GSM Modem will send

out result code:

“ NORMAL POWER DOWN”

After this moment, the AT commands can’t be executed. The GSM Modem enters the POWER DOWN mode, only

the RTC is still active. POWER DOWN can also be indicated by STATUS pin, which is a low level voltage in this

mode.

1.4 Restart GSM Modem Using the PWRKEY Pin

You can restart GSM MODEM by driving the PWRKEY to a low level voltage for a short time(2-3 sec) and then

release, the same as turning on GSM MODEM using the PWRKEY pin. Before restarting the GSM MODEM, you

need delay at least 500ms from detecting the STATUS low level on. The restarting scenario illustrates as the

following figure.

1.5 Power Saving

There are two methods for the GSM Modem to enter into low current consumption status. “AT+CFUN” is used to

set GSM Modem into minimum functionality mode and DTR hardware interface signal can be used to lead system

to be in S EEP mode (or slow clocking mode).

1.6 Minimum Functionality Mode

Minimum functionality mode reduces the functionality of the GSM Modem to a minimum and, thus, minimizes the

current consumption to the lowest level. This mode is set with the “AT+CFUN” command which provides the

choice of the functionality levels <fun>=0，1，4

• 0: minimum functionality;

• 1: full functionality (default);

• 4: disable phone both transmit and receive RF circuits;

If GSM MODEM has been set to minimum functionality by “AT+CFUN=0”, the RF function and SIM card function

will be closed. In this case, the serial port is still accessible, but all AT commands correlative with RF function or

SIM card function will not be accessible.

If GSM MODEM has been set by “AT+CFUN=4”, the RF function will be closed, the serial port is still active. In this

case all AT commands correlative with RF function will not be accessible.

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After GSM MODEM has been set by “AT+CFUN=0” or “AT+CFUN=4”, it can return to full functionality by

“AT+CFUN=1”.

For detailed information about “AT+CFUN”, please refer to document [1].

1.7 Sleep Mode (Slow Cloc Mode)

We can control SIM900 GSM Modem to enter or exit the S EEP mode in customer applications through DTR signal.

When DTR is in high level and there is no on air and hardware interrupt (such as GPIO interrupt or data on serial

port), GSM MODEM will enter S EEP mode automatically. In this mode, GSM MODEM can still receive paging or

SMS from network but the serial port is not accessible.

Note: For GSM MODEM, it requests to set AT command “AT+CSC K=1” to enable the sleep mode; the default

value is 0, that can’t make the GSM Modem enter sleep mode. For more details please refer to our AT command

list.

1.8 Wa e Up GSM MODEM from SLEEP Mode

When GSM MODEM is in S EEP mode, the following methods can wake up the GSM Modem.

• Enable DTR pin to wake up GSM MODEM.

If DTR pin is pulled down to a low level，this signal will wake up GSM MODEM from power saving mode.

The serial port will be active after DTR changed to low level for about 50ms.

• Receiving a voice or data call from network to wake up GSM MODEM.

• Receiving a SMS from network to wake up GSM MODEM.

1.9 Summary of State Transitions (except SLEEP mode)

The following figure shows how to proceed from one mode to another.

AT+CPOWD or Drive

PWRKEY to ground

Drive PWRKEY to ground

Normal Mode

PWR down

Mode

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2.0 Serial Interfaces

The GSM module is designed as a DCE (Data Communication Equipment), following the traditional DCE-DTE (Data

Terminal Equipment) connection. The GSM Modem and the client (DTE) are connected through the following

signal (as following figure shows). Autobauding supports baud rate from 1200bps to 57600bps.

Serial port

• TXD: Send data to the RXD signal line of the DTE

• RXD: Receive data from the TXD signal line of the DTE

serial port of the GSM engine supports autobauding for the following baud rates: 1200, 2400, 4800, 9600,

19200,38400 and 57600bps. Factory setting is autobauding enabled. This gives you the flexibility to put the

GSMengine into operation no matter what baud rate your host application is configured to. To take advantage

ofautobauding mode, specific attention should be paid to the following requirements:

Synchronization between DTE and DCE:

When DCE powers on with the autobauding enabled, user must first send “A” to synchronize the baud rate. It is

recommended to wait 2 to 3 seconds before sending “AT” character. After receiving the “OK” response, DTE and

DCE are correctly synchronized. The more information please refer to the AT command “AT+IPR”.

Restrictions on autobauding operation

• The serial port has to be operated at 8 data bits, no parity and 1 stop bit (factory setting).

• The Unsolicited Result Codes like "RDY", "+CFUN: 1" and "+CPIN: READY” are not indicated when you start

up the ME while autobauding is enabled. This is due to the fact that the new baud rate is not detected

unless DTE and DCE are correctly synchronized as described above.

Note: You can use AT+IPR=x to set a fixed baud rate and save the configuration to non-volatile flash memory.

After the configuration is saved as fixed baud rate, the Unsolicited Result Codes like "RDY" should be received

from the serial port all the time that the GSM MODEM is power on.

AT Command Syntax

When DCE powers on with the autobauding enabled, user must first send “A” to synchronize the baud rate. It is

recommended to wait 2 to 3 seconds before sending “AT” character. After receiving the “OK” response, DTE and

DCE are correctly synchronized The “AT” or “at” prefix must be set at the beginning of each Command. To

terminate a Command line enter <CR> , otherwise known as carriage return or \r.

Commands are followed by a response that includes <CR>< F><response><CR>< F>. Only the responses are

presented in the document here, <CR>< F> are omitted intentionally.

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