User's Manual

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17 Appendix
17.1 i-PORT Printed Circuit Boards
The i-PORT consists of three PCBs, the Power Supply Board, the
Computer Board, and the LED Board.
17.1.1 The Power Supply Board
This circuit board incorporates the following functional groups and
components:
Bridge Rectifier for AC Input Power
Self-resetting Fuse
30V Switching Power Supply (internal)
12V Switching Power Supply (internal & auxiliary user access)
5V Switching Power Supply (internal & auxiliary user access)
3.3V Switching Power Supply (internal)
6V Battery Charger Switching Power Supply (external)
Real Time Clock Backup Voltage Supply (internal)
Quadruple Antenna Multiplexer, software controlled
CPU Reset Circuit, monitoring 3.3V and RESET pushbutton
Selector Slide Switch for Serial Bus Standard, RS-232 or RS-485
Serial Driver Chips for RS-232 and RS-485
Opto isolators and Over voltage Protection for all Inputs & Outputs
4 User definable Solid State Relays, SPST
Piezo Buzzer, software controlled
17.1.2 The Computer Board
This circuit board incorporates the following functional groups and
components:
Main CPU, Type 486; running OS Windows CE®
Onboard DRAM
Four PCMCIA slots for PC Cards Type II (see also ‘PC Cards
Description’)
Diagnostic Connector
LCD Line Drivers and Connectors (LCD Panel with Touch-Screen is
optional)
17.1.3 The LED Board
This circuit board incorporates the following components:
System Master Reset Pushbutton
30 LED’s to indicate the operational status of the i-PORT (see LED
description)