SimCom T900 User manual

T900_User Guide_V1.02

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T900_User Guide_V1.02 2 2013-05-22
Document Title T900 User Guide
Version 1.02
Date 2013-05-22
Status Release
Document Control ID T900_User Guide_V1.02
General Notes
SIMCom offers this information as a service to its customers, to support application and engineering efforts that
use the products designed by SIMCom. The information provided is based upon requirements specifically
provided to SIMCom by the customers. SIMCom has not undertaken any independent search for additional
relevant information, including any information that may be in the customer’s possession. Furthermore, system
validation of this product designed by SIMCom within a larger electronic system remains the responsibility of the
customer or the customer’s system integrator. All specifications supplied herein are subject to change.
Copyright
This document contains proprietary technical information which is the property of SIMCom Limited, copying of
this document and giving it to others and the using or communication of the contents thereof, are forbidden
without express authority. Offenders are liable to the payment of damages. All rights reserved in the event of grant
of a patent or the registration of a utility model or design. All specification supplied herein are subject to change
without notice at any time.
Copyright © Shanghai SIMCom Wireless Solutions Ltd. 2013

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Contents
Contents.................................................................................................................................................................... 3
Version History ........................................................................................................................................................ 6
1Introduction....................................................................................................................................................... 7
2Key features....................................................................................................................................................... 7
3Terminal dimensions ........................................................................................................................................ 9
4Installation....................................................................................................................................................... 10
5Interface introduction......................................................................................................................................11
5.1 Overview .................................................................................................................................................11
5.2 T900 Functional Diagram....................................................................................................................... 12
5.3 Accessory information............................................................................................................................ 13
6Application Interface...................................................................................................................................... 13
6.1 Power Supply.......................................................................................................................................... 13
6.2 Serial Interface........................................................................................................................................ 15
6.3 10 PIN I/O interface ............................................................................................................................... 16
6.3.1 Audio interface.................................................................................................................................... 17
6.3.2 ADC channel....................................................................................................................................... 20
6.3.3 GPIO interfaces................................................................................................................................... 21
6.4 Antenna interface.................................................................................................................................... 21
6.4.1 Antenna connector .............................................................................................................................. 21
6.4.2 Antenna specifications ........................................................................................................................ 22
6.4.3 Antenna placement.............................................................................................................................. 22
6.5 LED indicator ......................................................................................................................................... 23
6.6 SIM Card Interface ................................................................................................................................. 23
7Electrical, Reliability and Radio Characteristics......................................................................................... 25
7.1 Absolute Maximum Ratings................................................................................................................... 25
7.2 Recommended Operating Conditions..................................................................................................... 25
7.3 Electro-Static Discharge ......................................................................................................................... 25
7.4 Operating frequency ............................................................................................................................... 26
7.5 Transmitter output power and receiver sensitivity ................................................................................. 26
8Software/ Firmware Upgrade ........................................................................................................................ 26
8.1 Tool introduction .................................................................................................................................... 26
8.2 Illustration of software updating............................................................................................................. 26
Appendix ................................................................................................................................................................ 32
A. Related Documents.......................................................................................................................................... 32
B. Terms and Abbreviations ................................................................................................................................. 32
C. Safety Caution ................................................................................................................................................. 34

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Table Index
TABLE 1: T900 KEY FEATURES..................................................................................................................................... 8
TABLE 2: THE CONSUMPTION IN SLEEP MODE..................................................................................................... 14
TABLE 3: THE POWER LINE ASSIGNMENT.............................................................................................................. 14
TABLE 4: 9-POLE D-SUB (FEMALE) RS-232.............................................................................................................. 15
TABLE 5: SIGNAL ASSIGNMENT OF 10 PIN CABLE ............................................................................................... 17
TABLE 6: AUDIO OUTPUT CHARACTERISTICS ...................................................................................................... 18
TABLE 7: AT+CMIC CHANGE THE MICROPHONE GAIN LEVEL.......................................................................... 18
TABLE 8: AT+CLVL CHANGE THE SPEAKER VOLUME LEVEL............................................................................ 19
TABLE 9: ADC SPECIFICATION .................................................................................................................................. 20
TABLE 10: AT+CADC READ ADC................................................................................................................................20
TABLE 11: AT+SGPIO CONTROL THE GPIO........................................................................................................... 21
TABLE 12: ANTENNA SPECIFICATIONS.................................................................................................................... 22
TABLE 13: STATUS OF THE NETLIGHT INDICATOR (GREEN).............................................................................. 23
TABLE 14: AT+CSDT SWITCH ON OR OFF DETECTING SIM CARD..................................................................... 23
TABLE 15: ABSOLUTE MAXIMUM RATINGS........................................................................................................... 25
TABLE 16: RECOMMENDED OPERATING CONDITIONS ....................................................................................... 25
TABLE 17: THE ESD CHARACTERISTICS (TEMPERATURE: 25℃, HUMIDITY: 45 %) ....................................... 25
TABLE 18: OPERATING FREQUENCY........................................................................................................................ 26
TABLE 19: TRANSMITTER OUTPUT POWER AND RECEIVER SENSITIVITY .................................................... 26
TABLE 20: RELATED DOCUMENTS ........................................................................................................................... 32
TABLE 21: TERMS AND ABBREVIATIONS................................................................................................................ 32
TABLE 22: SAFETY CAUTION..................................................................................................................................... 34

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Figure Index
FIGURE 1: T900 OVERVIEW .......................................................................................................................................... 7
FIGURE 2: MECHANICAL DIMENSIONS OF T900（UNIT: MM）......................................................................... 10
FIGURE 3: INSTALLATION OF THE TERMINAL ...................................................................................................... 10
FIGURE 4: T900 INTERFACE FRONT VIEW............................................................................................................... 11
FIGURE 5: T900 INTERFACE BACK VIEW ................................................................................................................ 11
FIGURE 6: T900 FUNCTIONAL DIAGRAM ................................................................................................................ 12
FIGURE 7: ACCESSORY INFORMATION.................................................................................................................... 13
FIGURE 8: DIMENSIONS OF POWER LINE（UNIT: MM）..................................................................................... 14
FIGURE 9: POWER INTERFACE .................................................................................................................................. 14
FIGURE 10: PIN ASSIGNMENT RS-232 (D-SUB 9-POLE FEMALE) ........................................................................ 15
FIGURE 11: COM PORT PROPERTIES OF THE HYPER TERMINAL....................................................................... 16
FIGURE 12: SIGNAL ASSIGNMENT OF 10PIN I/O PORT ......................................................................................... 16
FIGURE 13: DIMENSIONS OF 10-LINE CABLE......................................................................................................... 17
FIGURE 14: AUDIO REFERENCE CIRCUIT................................................................................................................ 18
FIGURE 15: ANTENNA INTERFACE ........................................................................................................................... 22
FIGURE 16: INDICATOR LED....................................................................................................................................... 23
FIGURE 17: INSTALLATION OF SIM CARD .............................................................................................................. 24
FIGURE 18: MAIN UI..................................................................................................................................................... 27
FIGURE 19: PARAMETER SETTING ........................................................................................................................... 27
FIGURE 20: BROWSE THE SOURCE FILE ................................................................................................................. 28
FIGURE 21: CONNECT TO PC BY RS232 INTERFACE WITHOUT POWER UP ..................................................... 29
FIGURE 22: CLICK DOWNLOAD BUTTON WITHOUT POWER UP ....................................................................... 29
FIGURE 23: POWER UP THE TERMINAL................................................................................................................... 30
FIGURE 24: UPGRADE IN PROCEEDING................................................................................................................... 30
FIGURE 25: FINISH UPGRADING ............................................................................................................................... 31

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T900_User Guide_V1.02 6 2013.05. 22
Version History
Date Version Description of change Author
2012-05-3 1.00 Origin Honggang Ma
Demin Wu
2012-08-15 1.01 §6.3 Correct the PIN assignment Honggang Ma
2013-05-22 1.02 §6.3 Correct the signal assignment Honggang Ma

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1Introduction
This document describes features, functions and interfaces of T900 terminal in great detail.
T900 is a quad-band GSM/GPRS DTU that works on frequencies of GSM 850MHz, EGSM 900MHz, DCS
1800MHz and PCS 1900MHz, which is a ideal solution for wireless m2m applications, the terminal features
GPRS multi-slot class 10/ class 8 (optional) and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.
With the help of this document user can understand T900 interface specifications, electrical and mechanical
quickly.
Figure 1: T900 overview
Note: The T900 Terminal is fully complying with RoHS requirements of European standards.
2Key features
T900 terminal has the following features:
1. Standard AT commands set
2. SIMCom proprietary AT commands set
3. Watch-dog function
4. Short circuit protection
5. Voice call
6. GPIOs
7. ADC function
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Table 1: T900 key features
Feature Implementation
Power supply 5V ~ 30V
Power saving Typical power consumption in sleep mode is 70mW ( BS-PA-MFRMS=9 )
Frequency bands
zT900 Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. T900 can
search the 4 frequency bands automatically. The frequency bands also can be
set by AT command “AT+CBAND”. For details, please refer to document
[1].
zCompliant to GSM Phase 2/2+
Transmitting power
zClass 4 (2W) at GSM 850 and EGSM 900
zClass 1 (1W) at DCS 1800 and PCS 1900
GPRS connectivity
zGPRS multi-slot class 10（default）
zGPRS multi-slot class 8 (option)
Temperature range
zNormal operation: -30°C ~ +80°C
zRestricted operation: -40°C ~ -30°C and +80 °C ~ +85°C*
zStorage temperature -45°C ~ +90°C
Data GPRS
zGPRS data downlink transfer: max. 85.6 kbps
zGPRS data uplink transfer: max. 42.8 kbps
zCoding scheme: CS-1, CS-2, CS-3 and CS-4
zIntegrate the TCP/IP protocol.
zSupport Packet Broadcast Control Channel (PBCCH)
CSD zSupport CSD transmission
USSD zUnstructured Supplementary Services Data (USSD) support
SMS
zMT, MO, CB, Text and PDU mode
zSMS storage: SIM card
FAX Group 3 Class 1
SIM interface Support SIM card: 1.8V, 3V
External antenna SMA type RF connector
Audio features
Speech codec modes:
zHalf Rate (ETS 06.20)
zFull Rate (ETS 06.10)
zEnhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
zAdaptive multi rate (AMR)
zEcho Cancellation
zNoise Suppression
RS232 serial port
Serial port:
zFull modem interface with status and control lines, unbalanced,
asynchronous.
z1200bps to 115200bps.
zCan be used for AT commands data stream.
zSupport RTS/CTS hardware handshake and software ON/OFF flow control.
zMultiplex ability according to GSM 07.10 Multiplexer Protocol.
zAutobauding supports baud rate from 1200 bps to 57600bps.
Phonebook management Support phonebook types: SM, FD, LD, RC, ON, MC.
SIM application toolkit GSM 11.14 Release 99

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Physical characteristics Size: 98*60*23mm
Weight: 125g
Firmware upgrade Firmware upgradeable by RS232 interface
*T900 does work at this temperature, but some radio frequency characteristics may deviate from the GSM specification.
3Terminal dimensions
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Figure 2: Mechanical dimensions of T900（Unit: mm）
4Installation
The terminal can be fixed by two kickstands (Optional) that provided by SIMCom, the following figure is the
illustration.
Figure 3: Installation of the terminal
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5Interface introduction
5.1 Overview
T900 Terminal provides the following connectors for power supply, GPIOs, Audio, ADC, Serial port and
antenna:
zThe GSM antenna interface(SMA type female connector)
zThe 4 PIN I/O port for power supply
zThe 10 PIN I/O port for audio, GPIOs and ADC
zThe standard RS232 interface
zLED indicator for power (Red) and GSM Netlight (Green)
zSIM card holder
Figure 4: T900 interface Front view
Figure 5: T900 interface Back view
Note: For the I/O interface, SIMCom could provide 4-line cable and 10-line cable (optional) to assist
developers; it will be introduced at the following chapter.
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5.2 T900 Functional Diagram
The following figure shows a functional diagram of T900 and typical accessories.
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Figure 6: T900 functional diagram

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5.3 Accessory information
Figure 7: Accessory information
A: T900 Terminal
B: GSM Antenna
C: Male to Female DB9 Line
D: 5V Adapter
E: Two kickstands (Optional)
F: 10-Line cable (Optional)
G: 4-Line power line (Optional)
6Application Interface
6.1 Power Supply
Customer can use the DC adapter that SIMCom provides as the power source.
If customer does not use the adapter, then DC source should be satisfied with the following requirements.
zInput voltage range 5-30V
zNormalvoltage 12V
zCurrentability 1A
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Table 2: The consumption in sleep mode
T900 @5V @12V @15V
Sleep current 14.5mA 7.75mA 5.02mA
The following chapter introduces the power line that SIMCom provides to customers, customer can power the
terminal by connect the terminal to the DC source via this line.
The power line includes four lines as the following figure shows, and table 3 gives a detailed description.
Table 3: The power line assignment
PIN Number Colour Item
1white NC
2Red Power
3Yellow NC
4Black Ground
Figure 8: dimensions of power line（Unit: mm）
Figure 9: Power interface
When a valid power appears the terminal will power up automatic, for the MCU that inside the terminal processed
the power up part, MCU also acts as a Watch Dog, when the terminal runs wrong, MCU will cut off the power
and recover it immediately to restart the terminal.
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6.2 Serial Interface
T900 provides one asynchronous RS232 serial port (female).The RS232 standard interface serves to connect a PC,
Data Terminal Equipment (DTE) or other application, which acts as host controller of the T900 Terminal with all
its functions. Through the RS232 interface it can be used as GSM/GPRS modem for sending and receiving of
SMS, Data and Fax calls.
Figure 10: Pin assignment RS-232 (D-Sub 9-pole female)
Table 4: 9-pole D-Sub (female) RS-232
Pin no Signal name I/O Function
1 DCD O Data Carrier Detected
2 RXD O Receive Data
3 TXD I Transmit Data
4 DTR I Data Terminal Ready
Attention: The ignition of T900
Terminal is activated via a rising
edge of high potential (+3 ... +15 V)
5 GND - Ground
6 DSR O Data Set Ready
7 RTS I Request To Send
8 CTS O Clear To Send
9 RING O Ring Indication
Note: T900 supports autobauding, Autobauding allows T900 to automatically detect the baud rate of the host
device. User can use AT command “AT+IPR=x” to set a fixed baud rate and the setting will be saved to
non-volatile flash memory automatically. After the configuration is set as fixed baud rate, the URC such as
"RDY", "+CFUN: 1" and "+CPIN: READY” will be reported when T900 is powered on.
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Hyper terminal usually as the PC software tool to operate T900; customer can set up a connection between PC and
terminal, configure the port properties as the figure 9 shows.
Figure 11: COM port properties of the hyper terminal
6.3 10 PIN I/O interface
T900 provides a 10 PIN I/O interface for customer use, including Audio, GPIOs and 1 ADC channel.
The following figure gives a brief view of signal assignment.
Figure 12: signal assignment of 10PIN I/O port
To make the usage conveniently, SIMCom provides a cable for customer, it can be inserted to the 10 PIN I/O port
so customer can develop their application by connecting some devices.
Figure 13 shows the specification of the cable.
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
Figure 13: Dimensions of 10-line cable
Table 5: signal assignment of 10 pin cable
Connecting diagram
Terminal signal
P1 Wire color and cutting
length Signal name I/O Comments
1 Green GPIO3 I/O
2 Yellow GPIO1 I/O
Configurable
by AT
commands
3 Black GND Ground
4 Orange SPK+ O
5 Brown MIC+ I
6 White GPIO4 I/O
7 Gray GPIO2 I/O
Configurable
by AT
commands
8 Red ADC I
9 Purple SPK- O
10 Blue
1007 26#
MIC- I
6.3.1 Audio interface
T900 has one pair of audio input and audio output; it can be connected to a handset directly.
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Figure 14: Audio reference circuit
Table 6: Audio Output Characteristics
Parameter Conditions Min Typ Max Unit
RL=32Ω
THD=0.1% - 91 - mW
RL=32Ω
THD=1% - 96 - mW
Output swing
Voltage
(single ended)
1.1 Vpp
Normal
Output(SPK)
Output swing
Voltage
(differential)
2.2 Vpp
Customer can set the terminal MIC gain level to make the sounds louder so that the listener can hear more clearly.
And if the sound a little lower on the terminal side, customer can use the “AT +CLVL” to make the sound higher
so that customer can hear clearly.
The AT commands should be send to the terminal by RS232 interface, and the following table shows the detail
commands.
Table 7: AT+CMIC Change the Microphone Gain Level
AT+CMIC Change the Microphone Gain Level
Response
+CMIC: (list of supported <channel>s),(list of supported <gainlevel>s)
OK
Test Command
AT+CMIC=?
Parameters
See Write Command
Read Command
AT+CMIC?
Response
+CMIC: (<channel0>,<gainlevel0>),…,(<channeln>,<gainleveln>)
OK
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Parameters
See Write Command
Response
OK
ERROR
Write Command
AT+CMIC=
<channel>,<gain level>
Parameters
<channel> 0 Main audio handset channel
<gain level> Int: 0 – 15
0 0dB
1 +1.5dB
2 +3.0 dB
3 +4.5 dB
4 +6.0 dB
5 +7.5 dB
6 +9.0 dB
7 +10.5 dB
8 +12.0 dB
9 +13.5 dB
10 +15.0 dB
11 +16.5 dB
12 +18.0 dB
13 +19.5 dB
14 +21.0 dB
15 +22.5 dB
Example: AT+CMIC=0,10
This command used to set the terminal MIC gain level to +15db.
Table 8: AT+CLVL Change the Speaker Volume Level
AT+CLVL Loud Speaker Volume Level
Response
+CLVL: (list of supported <level>s)
OK
If error is related to ME functionality:
+CME ERROR: <err>
Test Command
AT+CLVL=?
Parameter
See Write Command
Read Command
AT+CLVL?
Response
+CLVL: <level>
OK
If error is related to ME functionality:

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+CME ERROR: <err>
Parameter
See Write Command
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
Write Command
AT+CLVL=<leve
l>
Parameter
<level> 0-100 Integer type value with manufacturer specific range
(smallest value represents the lowest sound level)
Reference
GSM 07.07 [13]
Note
Please refer to document [1] and document [5] for details.
6.3.2 ADC channel
T900 provides an auxiliary ADC, which can be used to measure the voltage. User can use AT command
“AT+CADC” to read the voltage value.
Table 9: ADC specification
Parameter Min Typ Max Unit
Voltage range 0 - 2.8 V
ADC Resolution - 10 - bits
Sampling rate - - 200K Hz
Note: the maximum voltage that the ADC can gather is 2.8V
Table 10: AT+CADC Read ADC
AT+CADC Read ADC
Response:
+CADC: (list of supported <status>s),(list of supported <value>s)
OK
Test Command
AT+CADC=?
Parameters
<status> 1 Success
0 Fail
<value> Integer 0-2800
Response:
+CADC: <status>,<value>
OK
Read Command
AT+CADC?
Parameters
See Test Command