User's Guide
Table Of Contents
- Chapter 1 – Product Description and Specification
- Chapter 2 – Mechanical Specifications
- Chapter 3 – Electrical Characteristics
- Chapter 4 – SocketModem Interfaces
- Chapter 5 – SocketModem Test Board
- Chapter 6 – Application Considerations
- Appendix A – Safety Precautions & Regulatory Stan
- Appendix B – Sources for Peripheral Devices
- Appendix C – AT Command List
- Appendix D – Acronyms and Abbreviations
- Index
Chapter 4 - SocketModem Interfaces
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Chapter 4 – SocketModem Interfaces
This chapter describes the SocketModem interfaces.
· Flashing LED
· SIM Interface
· RF Interface
Flashing LED
The flashing LED signal is used to indicate the working mode of the SocketModem.
LED and SocketModem Status
Signal SocketModem Status
OFF Download mode or switched OFF>
Continuously lit Switched ON (not registered on the network)ON
Flashing Switched ON (registered on the network)
SIM Interface
The internal SIM interface of the SocketModem supports 3V SIMs only.
Note: This interface is fully compliant with GSM 11.11 recommendations concerning the SIM functionality.
Five Signals Are Available
SIMVCC: SIM power supply.
SIMRST: reset.
SIMCLK: clock.
SIMDATA: I/O port.
SIMPRES1 SIM card detect.