User's Manual

Document Number/Ref.-No. Issue
00-6383A01 1.0
(113491 2)
Page 10 of 26
Copyright  2000 by Harris Corporation, RF Communications Division
All rights reserved. No part of this publication may be reproduced or transmitted in
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writing by
Harris Corporation, RF Communications Division,
Rochester, New York, USA
•
Plug the unconnected end of the J2 (RX) cable into the 9 pin D-Connector labeled GPS TIME
MARK
This completes the connecting of the LAAS Receiver and the LAAS Transmitter to the LAAS Host Simulator.
4.2 File Placement
The LAAS Host Simulator consists of the following three (3) files:
•
hostlaas.exe - application
•
hostlaas.cfg - configuration file for LAAS Host Simulator (address of Counter I/O ISA card and
calibration constant for crystal oscillator on the Counter I/O ISA card)
•
laashelp.txt - online help text file
The above listed files must be installed in a common directory.
4.3 How to configure and execute the LAAS Host Simulator
The LAAS Host Simulator is a DOS program, therefore the PC used to execute this program must be booted as a
DOS machine. The following configuration is required to be done:
•
change the line labeled
address=value
to the address of the Counter I/O card, this only has to be done if
the address of the Counter I/O card is not 0x300, because the LAAS Host Simulator defaults to an address
of 0x300
•
change the line labeled
CountsPerSecond=value
to the value determined by executing the procedure
described in Section 4.4 of this document, in order to generate accurate time marks
4.3.1 Installing the Counter I/O ISA card
Perform the following steps to install the Counter I/O ISA card:
1. Set the address of the Counter I/O ISA card to 0x300 unless it is known that this address conflicts with a
card already installed in the PC. If so, pick one of the other valid addresses, set the Counter I/O card to
that address and update the
address=
line in the LHS configuration to the selected address.
2. Set the IRQ to be used by the Counter I/O card to 7.
3. Set the number of wait states to no wait states.
4. Remove the cover from the PC.
5. Identify an empty ISA slot that provides enough room on the outside of the cabinet to plug a cable into the
D-connector located on the Counter I/O ISA card.
6. Install the Counter I/O ISA card into the empty ISA slot.
7. Replace the cover on the PC.
4.3.2 Determining if the Counter I/O ISA card is properly installed
From the directory containing the files listed in Section 4.2, type in the following command from the DOS prompt:
hostlaas