Hemisphere GPS Crescent A100 User manual

C OPYRIGHT N OTICE
Hemisphere GPS (Satloc LLC) Precision GPS Applications
© Copyright Hemisphere GPS (Satloc LLC) (2006). All rights reserved.
No part of this manual may be reproduced, transmitted, transcribed, stored in a retrieval
system or translated into any language or computer language, in any form or by any
means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without
the prior written permission of Hemisphere GPS (Satloc LLC).
T RADEMARKS
Hemisphere GPS and the Hemisphere GPS logo, Satloc and the Satloc logo, and CSI
Wireless and the CSI Wireless logo are trademarks of Hemisphere GPS (Satloc LLC), CSI
Wireless, Inc. and CSI Wireless LLC. Other trademarks are the properties of their
respective owners.
N OTICE TO C USTOMERS
Contact your local dealer for technical assistance. To find the authorized dealer near you,
call or write us at:
Hemishpere GPS
7650 E. Redfield Road, Suite B
Scottsdale, AZ 85260
Telephone number:
Fax number:
E-mail address:
[phone]
[phone]
[email protected]

Crescent A100 User Guide
i
1: Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
RS232 Serial Port 3
LED 3
Radar-Simulated Pulse Output 3
CAN 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cable Interface 6
Extension Power/Data Cable 7
Crescent A100 Placement 7
Mounting the Crescent A100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Powering the Crescent A100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Connecting the Crescent A100 to External Devices . . . . . . . . . . . . . . . . 15
Environmental Considerations 18
2: GPS Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
GPS Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
GPS Operation 20
Differential Operation 21
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
A: Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

ii
B: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
D: Crescent A100 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
E: Surface Mount Template . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

1: I NSTALLATION
Features
Installation
Mounting the Crescent A100
Powering the Crescent A100
Connecting Crescent A100 to External Devices

2
1: Installation
I NTRODUCTION
Congratulations on buying Hemisphere GPS’ new Crescent A100.
The Crescent A100 is a smart antenna that tracks GPS and SBAS
(WAAS and EGNOS) signals. The Crescent A100 provides sub-
meter performance with50 centimeter accuracy 95% of the time.
This chapter provides information on the following:
• Features
• Installation
• Mounting the Crescent A100
• Powering the Crescent A100
• Connecting the Crescent A100 to external devices

Crescent A100 User Guide
3
F EATURES
The Crescent A100 has several new features that will enhance your
product’s performance. The main features are:
• 2 RS232 serial ports
•LED
• Radar-simulated pulse output
• CAN communication
RS232 Serial Port
The RS232 serial is used for NMEA 0183, Hemisphere GPS interface
protocol, RTCM SC-104 and upgrading firmware. See the general
GPS technical reference at www.hemispheregps.com for more
detailed information.
LED
The Crescent A100 uses one tri-colored LED:
• Red indicates the power is on
• Amber indicates a GPS lock
• Flashing green indicates DGPS is being acquired
• Green indicates a DGPS solution
Radar-Simulated Pulse Output
The radar-simulated pulse output provides accurate ground speed.
The Crescent A100 uses pin 12 for the speed out pin. Pin 12 will
output a square wave with a 50% duty cycle. The frequency of the

4
1: Installation
square wave varies directly with speed. 94 Hz represents a speed
of 1 meter per second, or a 28.65 pulse per foot traveled.
CAN
The Crescent A100 features Controller Area Network (CAN) to
handle communication between CAN-based devices.
The Crescent A100 supports a selection of NMEA 2000 messages
that can be broadcast on a CAN bus. Table 1-1 provides a listing of
the NMEA 2000 commands that are used.
Note: Pin 12 does not have any form of isolation or surge
protection. You are STRONGLY encouraged to incorporate
some form of isolation circuitry into your supporting
hardware if you wish to utilize the Speed Radar Pulse
output.
Table 1-1: NMEA 2000 commands
PGN 129029 GNSSPositionData
PGN 129025 GNSSPositionRapidupdate
PGN 129026 NMEACogSogData

Crescent A100 User Guide
5
I NSTALLATION
The Crescent A100 is a smart antenna that tracks GPS and SBAS
(WAAS and EGNOS). It utilizes Hemisphere GPS’ exclusive
COAST™technology during differential outages. The Crescent
A100 is also capable of using Hemisphere GPS’ e-Dif®and L-Dif®
technology. Figure 1-1 provides a front view of the deutsche
connector receptacle’s numbering.
Figure 1-1. Deutsche connector receptacle numbering
Table 1-2 provides the Deutsche connector’s pin-outs.
Table 1-2: Deutsche connector’s pin-outs
Pin-Out Function
1 Manual mark in
2TxB
3RxB
4CANhigh
5
10
8
12
7
6
9
1
2
11
3
4

6
1: Installation
Cable Interface
The cable options include:
•DB9serial
•Speed
•CAN
•Power
Additional extension cables may be purchased, as necessary, for other
installations. This allows the Crescent A100 to be quickly and easily
moved form one installation to another. If an extension cable is
damaged in the field, it can be replaced without returning the complete
Crescent A100 system.
Other power cables are available as accessories to fit a wide variety
of applications. See Appendix E for a list of Crescent A100
accessories.
5 Signal Ground
6TxA
7OnePPS
8RxA
9CANlow
10 Power in (12 V)
11 Power ground
12 Speed out
Table 1-2: Deutsche connector’s pin-outs
Pin-Out Function

Crescent A100 User Guide
7
Extension Power/Data Cable
The Crescent A100 system is quickly installed with one of the
various extension cables. The location of the extension cable
should be made with the following requirements in mind:
• Power leads at the “Y” end must reach a power source.
• The data connector communication port must reach to
connect to a data storage device or guidance system.
When choosing a route for the Crescent A100 extension cable:
• Avoid running cables in areas of excessive heat
• Keep cables away from corrosive chemicals
• Do not run the extension cable through door or window
jams
• Keep the cables away from rotating machinery
• Do not bend excessively or crimp the cables
• Avoid placing tension on the cables
• Remove unwanted slack from the extension cable at the
receiver end
• Secure along the cable route using plastic wraps
Crescent A100 Placement
Placement of the Crescent A100 is crucial to the system’s
operation. The GPS engine inside the Crescent A100 computes a
position based upon measurements from each satellite to the
Warning:
Improperly installed cables near machinery can be
dangerous.