User's Manual

Document Number/Ref.-No. Issue
00-6383A01 1.0
(113491 2)
Page 8 of 26
Copyright  2000 by Harris Corporation, RF Communications Division
All rights reserved. No part of this publication may be reproduced or transmitted in
any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in
writing by
Harris Corporation, RF Communications Division,
Rochester, New York, USA
3 LAAS Host Simulator Hardware Requirements
The LAAS Host Simulator needs the following hardware:
•
An Intel (or equivalent) based PC
•
ComputerBoards, Inc. CIO-CTR05 Counter I/O ISA card
•
An Interface Box with power supply
•
A LAAS VHF Extended Dynamic Range Receiver or a LAAS VHF receiver
•
A LAAS VHF Transmitter
•
A cable to connect the Counter I/O ISA card to the Interface Box
•
Shielded RS-232 cables to connect the PC COM ports to the Interface Box
•
Shielded RS-232 cables to connect the Interface Box to the LAAS receiver and the LAAS transmitter
•
The adapter cabling shown in Appendix C may be used to allow the connection of the LAAS Host Simulator
to the VDR-2205 hardware platform used for the LAAS Enhanced Sensitivity Receiver
The following sections provide a brief description of the PC System Requirements, a brief description of CIO-CTR05
Counter I/O ISA card and a brief description of the purpose of the Interface Box. The other items listed above will not
be described because these items do not require any specific setup or their purpose is self explanatory.
3.1 PC System Requirements
Windows 95 running in DOS mode (not a DOS window)
(Note: The LAAS Host Simulator may run under Win98, but has not been tested.)
16 Megabytes of RAM
One available ISA slot
IRQ7 available
Two serial ports available (COM1, COM2)
Pentium @ 133 MHz (or equivalent)
3.2 ComputerBoards CIO-CTR05 Counter I/O ISA card
To meet the control requirements of the LAAS receiver and LAAS transmitter, a Counter I/O ISA card manufactured
by ComputerBoards, Inc. is installed in the PC. This is a half-length card, and occupies one ISA slot. The default
location of the card in the PC I/O space is 0x300. This may be changed by reconfiguring jumpers on the card. An
interrupt generated by the Counter I/O card is mapped to IRQ7. This IRQ is normally associated with the parallel port
of the PC. This Counter I/O ISA card is used to generate the simulated Global Positioning System (GPS) time marks
used by the LAAS receiver and the LAAS transmitter.
3.3 Interface Box
The LHS communicates to the LAAS receiver and the LAAS transmitter via two serial ports, COM1 and COM2. All
signals from the PC (COM ports and Counter I/O card) are routed through an interface box before going to the LAAS
receiver and the LAAS transmitter. This interface box serves two purposes, it shifts the RS-232 and TTL signal levels
to RS-422 signal levels, and it routes the Counter I/O ISA card signals as required by the LAAS Host Simulator.