EDW-ML8021 GSM GPRS Modem User’s Manual
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EDW-ML8021 GSM GPRS Modem User’s Manual
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EDW-ML8021 GSM GPRS Modem User’s Manual
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Content
EDW-ML8021 GPRS Modem User’s Manual .............................................................................................. 1
1. Introduction ....................................................................................................................................... 3
2. Product concept ................................................................................................................................. 3
3. Application interface ......................................................................................................................... 5
3.1Pin description .............................................................................................................................. 5
3.2 Operating modes ......................................................................................................................... 5
3.3 LED indication ............................................................................................................................ 6
3.3.1 Red Led is the power indicates. .......................................................................................... 6
3.3.2 Yellow Led is the RING indicates. ..................................................................................... 6
3.3.3 Green Led is the Working state indicates. ......................................................................... 6
4. Mechanical dimension ...................................................................................................................... 7
5. Product List........................................................................................................................................ 8
EDW-ML8021 GSM GPRS Modem User’s Manual
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1. Introduction
This document
defines the EDW-ML8021 module series and describes the hardware interface of the
EDW-ML8021 module that
connects to the customer application and the hardware interface.
This document can help customer quickly understand module interface specifications, electrical
and mechanical details. With the help of this document, associated application notes and user
guide, customer can use EDW-ML8021 module to design and set up mobile applications
quickly.
2. Product concept
The EDW-ML8021 is a Quad-band GSM/GPRS engine that works at frequencies
GSM850MHz, GSM900MHz, DCS 1800MHz andPCS1900MHz. The EDW-ML8021 features
GPRS multi-slot class 12 and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.
The EDW-ML8021 is integrated with Internet service protocols, which are TCP/UDP, FTP and HTTP.
Extended AT commands have been developed for customer to use these Internet service protocols
easily.
Table 1 Module key features
Feature
Implementation
Power supply
Single supply voltage 5.0V
– 12V.
Frequency bands
● Quad
-
band: GSM850, GSM900, DCS1800, PCS1900.
● The module can search these frequency bands automatically
● The frequency bands can be set by AT command.
● Compliant to GSM Phase 2/2+
Tr
ansmitting power
●Class 4 (2W) at GSM850 and GSM900
●Class 1 (1W) at DCS1800 and PCS1900
GPRS connectivity
● GPRS multi
-
slot class 12 (default)
● GPRS multi-slot class 1~12 (configurable)
● GPRS mobile station class B
Temperature range
● Normal
operation:
-
35°C ~ +80°C
● Restricted operation: -45°C ~ -35°C and +80°C ~ +85°C
1)
● Storage temperature: -45°C ~ +90°C
DATA GPRS:
● GPRS data downlink transfer: max. 85.6 kbps
● GPRS data uplink transfer: max. 85.6 kbps
● Coding scheme: CS-1, CS-2, CS-3 and CS-4
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CSD:
● Support the protocols PAP (Password Authentication Protocol)
usually used for PPP connections
● Internet service protocols TCP/UDP/FTP/HTTP/MMS
● Support Packet Switched Broadcast Control Channel (PBCCH)
● CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps non-transparent
● Unstructured Supplementary Services Data (USSD) support
SMS
● MT, MO, CB, Text and PDU mode
● SMS storage: SIM card
FAX
Group 3 Class 1 and Class 2
SIM interface
Port SIM card: 1.8V, 3V,Protected again
st ESD with a TVS diode
array.
Serial interface
● Support from 4800 bps to 115200 bps, default auto baud rate
● Support RS232
● Embed standard AT command（GSM07.05 and 07.07）
Phonebook
management
Support phonebook types: SM, FD, LD, RC, ON, MC
SIM
Application Toolkit
Support SAT class 3, GSM 11.14 Release 99
Physical characteristics
79*53*21mm
1) When the module works in this temperature range, the deviations from the GSM specification
might occur. For example, the frequency error or the phase error could increase.
Table 2 Coding schemes and maximum net data rates over air interface
Coding scheme
1 Timeslot
2 Timeslot
4 Timeslot
CS-1: 9.05kbps
18.1kbps
36.2kbps
CS-2:
13.4kbps
26.8kbps
53.6kbps
CS-3:
15.6kbps
31.2kbps
62.4kbps
CS-4:
21.4kbps
42.8kbps
85.6kbps
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3. Application interface
3.1Pindescription
Table 3 Pin description
PIN Name
1
,4,6,7,8,9
NC 2
TXD
3
RXD
5
GND
3.2 Operating modes
The table below briefly summarizes the various operating modes referred to in the following
chapters.
Table 4 Overview of operating modes
Mode
Function
Normal
operation
GSM/GPRS
SLEEP
The module will automatically go into SLEEP mode if
DTR is set to high level and there is no interrupt (such
as GPIO interrupt or data on serial port).
In this case, the current consumption of module will
reduce to the minimal level.
During SLEEP mode, the module can still receive
paging message and SMS from the system normally.
GSM IDLE
Software is active. T
he module has registered to the
GSM network, and the module is ready to send and
receive.
GSM TALK
GSM connection is going. In this mode, the power
consumption is decided by the configuration of Power
Control Level (PCL), dynamic DTX control and the
EDW-ML8021 GSM GPRS Modem User’s Manual
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working RF band.
GPRS IDLE
The module is not
registered to GPRS network. The
module is not reachable through GPRS channel.
GPRS
STANDBY
The module is registered to GPRS network, but no
GPRS PDP context is active. The SGSN knows the
Routing Area where the module is located at.
GPRS
READY
The PDP
context is active, but no data transfer is going
on. The module is ready to receive or send GPRS data.
The SGSN knows the cell where the module is located
at.
GPRS DATA
There is GPRS data in transfer. In this mode, power
consumption is decided by the PCL, working RF band
and GPRS multi-slot configuration.
POWER
DOWN
Normal shutdown by sending the “AT+QPOWD=1”
command, using the
PWRKEY pin. The power management ASIC disconnects the power
supply from the base band part of the module, and only the power supply
for the RTC is remained. Software is not active. The serial interfaces are
not accessible. Operating voltage (connected to VBAT) remains applied.
Minimum
functionality
mode (without
removing power
supply)
Use the “AT+CFUN” command can set the module to a minimum
functionality mode without removing the power supply. In this case, the
RFpart of the module will not work or the SIM card will not be accessible,
or both RF part and SIM card will be closed all, but the serial port is still
accessible. The power consumption in this case is very low.
Note: The module is set to auto baud rate mode (AT+IPR=0) in default configuration. In the auto
baud rate mode, the URC “RDY” after powering on is not sent to host controller. AT command
can be sent to the module 2-3 seconds after the module is powered on. Host controller should
firstly send an “AT” or “at” string in order that the module can detect baud rate of host controller,
and it should send the second or the third “AT” or “at” string until receiving “OK” string from
module. If you need to using fixed baud rate, Then an “AT+IPR=x;&W” should be sent to
module and save the configuration to flash memory of module. After these configurations, the
URC “RDY” would be received from the Serial Port of module every time when the module is
powered on. Refer to Chapter “AT+IPR” in AR command manual.
3.3LED indication
3.3.1 Red Led is the power indication.
3.3.2 Yellow Led is the RING indication.
3.3.3 Green Led is the Working state indication.
The Working state of this LED is list in the table 6.
Table 6 Working state indication
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state
Module Function
Off The
module is not running(Power Off)
64ms On/800ms Off
The module is not synchronized with network
64ms On/2000ms Off
The module is synchronized with network
64ms On/600ms Off
GPRS data transfer is ongoing.
4. Mechanical dimension
EDW-ML8021 GSM GPRS Modem User’s Manual
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5. Product List
Name
Unit Quantity
Describe
Picture
EDW-ML8021
Item 1 Module
Antenna
Item 1 Standard Supply
Power Adapter
Item 1 DC 5V2A
RS-232 Cable
Item 1 Standard Supply
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