User's Manual

SIM900B Hardware Design
1 Introduction
This document describes the hardware interface of the SIMCom SIM900B module that connects to the specific
application and the air interface. As SIM900B can be integrated with a wide range of applications, all functional
components of SIM900B are described in great detail.
This document can help you quickly understand SIM900B interface specifications, electrical and mechanical
details. With the help of this document and other SIM900B application notes, user guide, the user can use
SIM900B module to design and set-up mobile applications quickly.
1.1 Related Documents
Table 1: Related documents
SN Document name Remark
[1] SIM900_ATC SIM900_ATC
[2] ITU-T Draft new
recommendation
V.25ter:
Serial asynchronous automatic dialing and control
[3] GSM 07.07: Digital cellular telecommunications (Phase 2+); AT command set for GSM
Mobile Equipment (ME)
[4] GSM 07.10: Support GSM 07.10 multiplexing protocol
[5] GSM 07.05: Digital cellular telecommunications (Phase 2+); Use of Data Terminal
Equipment – Data Circuit terminating Equipment (DTE – DCE) interface for
Short Message Service (SMS) and Cell Broadcast Service (CBS)
[6] GSM 11.14: Digital cellular telecommunications system (Phase 2+); Specification of the SIM
Application Toolkit for the Subscriber Identity Module – Mobile Equipment
(SIM – ME) interface
[7] GSM 11.11: Digital cellular telecommunications system (Phase 2+); Specification of the
Subscriber Identity Module – Mobile Equipment (SIM – ME) interface
[8] GSM 03.38: Digital cellular telecommunications system (Phase 2+); Alphabets and
language-specific information
[9] GSM 11.10 Digital cellular telecommunications system (Phase 2)； Mobile Station (MS)
conformance specification； Part 1: Conformance specification
[10] AN_Serial Port AN_Serial Port
1.2 Terms and Abbreviations
Table 2: Terms and Abbreviations
SIM900B_HD_V1.03 24.06.2010
8