User’s Manual
GSM35
5
RTD Finland Oy
Table of Contents
List of illustrations and tables ................................ 6
Chapter 1 Introduction ............................................ 7
Features .................................................................................................. 7
GSM cellular modem............................................................................... 7
16C550 compatible UART....................................................................... 8
I/O interfaces ........................................................................................... 8
Mechanical description............................................................................ 8
Connector description ............................................................................. 8
What comes with your board?................................................................. 9
Using this manual.................................................................................... 9
When you need help ............................................................................... 9
Chapter 2 Board settings ...................................... 10
Factory configured jumper settings ....................................................... 11
Base address jumpers........................................................................... 12
Host interrupts ....................................................................................... 14
Chapter 3 Board installation ................................. 15
Board installation................................................................................... 15
General purpose digital I/O connector .................................................. 16
SIM card holder ..................................................................................... 17
Chapter 4 Hardware description ........................... 19
The GSM wireless modem module........................................................ 20
GSM antenna considerations ................................................................ 20
SIM card reader .................................................................................... 21
UART serial port circuitry ...................................................................... 21
Digital I/O .............................................................................................. 22
