Novatel VEXXIS GT7800 User manual

GNSS TIMING SYNCHRONIZATION RECEIVER
USER GUIDE
OM-20000174 Rev 1 August 2017
GT7800
The GT7800 is a GNSS Time Synchronization Receiver that uses NovAtel’s OEM729™ receiver to provide highly
precise timing when used on its own or connected with an external oscillator. Standard interfaces are provided through
conventional connectors, eliminating the need for hard to nd and expensive custom cables. The GT7800 also fea-
tures advanced Ethernet support for remote conguration and access of receiver data.
Capable of tracking all present and upcoming Global Navigation Satellite System (GNSS) constellations and satellite
signals, the GT7800 is a simple to use system that is software upgradable to provide the custom performance required
for your application.
Box Contents
The following is provided with your NovAtel®GT7800 receiver:
• GT7800 Receiver Enclosure
• DC power cable assembly (NovAtel Part #01019538)
• 2 m USB cable type A to micro B (NovAtel Part #60723119)
Additional Equipment Required
Depending on the application, some or all of the following will be required:
• 1 BNC-BNC (male) cable assembly for connecting to External Oscillator port
• 1 TNC-TNC (male) 50 ohm coaxial cable for connecting to the Antenna port
• 1.8 m null modem cable (NovAtel Part #01017658, may contain DEHP), DB-9 female/female to connect to COMs 1, 2 or 3.
User provided cables for COM1-RS422, CAN0 and CAN1 connection, as necessary.
• A Microsoft Windows-based computing device with a RS-232 DB-9, USB port or 10/100BASE-T port
• A +9 VDC to 36 VDC power supply, capable of supplying at least 10 W
• A quality antenna, such as NovAtel’s VEXXIS® GNSS-500 or GNSS-800 Series or our xed reference GNSS-750 Wideband
Chock Ring Antenna. Refer to our web site: www.novatel.com/products/gnss-antennas for details.
NovAtel User Documentation, PC Software and Drivers
The complete suite of NovAtel OEM7 user documentation can be found at:
docs.novatel.com/OEM7
Download the latest version of NovAtel Connect and the Windows USB driver from:
www.novatel.com/novatel-connect
NovAtel, OEM7 and VEXXIS are registered trademark of NovAtel Inc.
Content subject to change without notice.
GT7800
©Copyright 2007-2017 NovAtel Inc. All rights reserved.
Printed in Canada on recycled paper. Recyclable.
Weight: 960 g
Dimensions are in millimetres
GT7800 Dimensions
62.5 55.65
170.00
190.00
160.00

Installation & Powering Steps
1. Connect the antenna and oscillator cables using the TNC/BNC end of the coaxial cable.
2. Connect the event end cable to applicable EVENT connector.
3. Set external power supply to 9 V to 36 V.
4. Connect any communications equipment to be used.
5. Connect power cord and plug into external power supply.
LED Stack: Status LED States
Left LED Stack from Top Right LED Stack from Top
LED# Description Color LED# Description Color
6n/a 7n/a
4n/a 5n/a
2n/a 3POS_VALID GREEN
0ERROR RED 1POWER RED
CAN Ports DB9, Female (x2)
PIN# CAN0 CAN1
1 NC NC
2CAN_L CAN_L
3GND GND
4 NC NC
5GND GND
6GND GND
7CAN_H CAN_H
8 NC NC
9 12 V CAN power 12 V CAN power
COM Ports DB9, Male (x3 Active)
PIN# COM1 COM2 COM3
1 NC NC NC
2RXD1 RXD2 RXD
3 TXD1 TXD2 TXD
4 NC NC NC
5GND GND GND
6NC NC NC
7 RTS1 RTS2 NC
8 CTS1 CTS2 NC
9 NC NC NC
COM4 and COM5 are not active. Future use.
Antenna and External Oscillator
TNC GNSS
Antenna
Antenna Selection
Install a quality GNSS antenna in a location with
an unobstructed view of the sky.
BNC
OSC
(External
Oscillator)
External Oscillator
Some applications require greater precision than
that possible with the OEM7 VCTCXO, in which
case you may need to connect the OEM7 to an
external high-stability oscillator, which may run at
either 5 MHz or 10 MHz.
Contact NovAtel Customer Support
Log a support request with NovAtel Customer Support using one of the following methods:
Log a Case and Search Knowledge: Website: www.novatel.com/support
Log a Case, Search Knowledge and View Your Case History (login access required):
Web Portal: https://novatelsupport.force.com/community/login
E-mail: [email protected]
Telephone: U.S. and Canada: 1-800-NOVATEL (1-800-668-2835) International: [phone]
Federal Communications Commission (FCC) and Innovation, Science and Economic Development (ISED) Canada
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equip-
ment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with this instruction manual may cause
harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at their own expense.
COM1
EVENT
IN 1
EVENT
IN 2
EVENT
OUT 1
EVENT
OUT 2
COM2
COM3
RESET
EXT. OSC ANTENNA
STATUS
ETHERNET
USB1 USB0
COM4 COM5 CAN1
POWER
(9-36 VDC)
CAN0
EVENT Ports
2 Position, 50 Ohm BNC, 1 GHz Max (X4)
NOTE: EVENT OUT 1 & EVENT IN 2 not active.
Reset Button
Press to perform
reset of receiver RJ45
10/100 Base-T
USB0 Device Micro-AB
NOTE: USB1 is not active. Future use.
TNC
BNC
Green LED
Link/Activity
Yellow LED
Not used
LED Stack
6
4
2
0
7
5
3
1
COM Ports
DB9, Male Active: COM 1, 2 and 3
NOTE: COM 4 and COM5 are not active. Future use.
CAN Ports
DB9, Female (X2)
LED Stack Legend
Refer to Table