Garmin 15L-F, 15H-F, 15H,15L Specifications

GPS 15H & 15L
TECHNICAL

SPECIFICATIONS

®

Garmin International, Inc.

1200 E. 151

Olathe, KS 66062 USA

190-00266-01, Revision D

February 2006

st

Street

© Copyright 2004–2006 Garmin Ltd. or its subsidiaries
Garmin International, Inc.

1200 East 151

st

Street, Olathe, Kansas 66062, U.S.A.
Tel. [phone] or 800/800.1020
Fax [phone]

Garmin (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9DL, U.K.
Tel. [phone]
Fax [phone]

Garmin Corporation
No. 68, Jangshu 2

nd

Road, Shijr, Taipei County, Taiwan
Tel. [phone]
Fax [phone]

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organization of such changes or improvements. Visit the Garmin Web site (

www.garmin.com) for current

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Garmin

®

, AutoLocate®, and MapSource® are registered trademarks and WAAS Enabled™ is trademark of

Garmin Ltd. or its subsidiaries and may not be used without the express permission of Garmin.
Web site address: www.garmin.com

RECORD OF REVISIONS

Revision Revision

Date

A 8/16/02 Initial Release -­B 10/22/04 Revised and Redrawn 28110
C 12/27/04 Revised and Redrawn 28960
D 2/17/06 Revised and Redrawn 36010

Description ECO #

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

Page ii

TABLE OF CONTENTS

1 Introduction..................................................................................................................1

1.1 Cautions ............................................................................................................................................1

1.2 Limited Warranty..............................................................................................................................2

1.3 Overview...........................................................................................................................................3

1.4 Features.............................................................................................................................................3

1.5 Technical Specifications ...................................................................................................................4

1.5.1 Physical Characteristics......................................................................................................................... 4

1.5.1.1 Size............................................................................................................................................ 4

1.5.1.2 Weight....................................................................................................................................... 4

1.5.1.3 Available Connector Options.................................................................................................... 4

1.5.1.4 Antenna Connector.................................................................................................................... 4

1.5.2 Electrical Characteristics....................................................................................................................... 4

1.5.2.1 Input Voltage............................................................................................................................. 4

1.5.2.2 Input Current............................................................................................................................. 4

1.5.2.3 GPS Receiver Sensitivity .......................................................................................................... 4

1.5.3 Environmental Characteristics............................................................................................................... 4

1.5.4 GPS Performance.................................................................................................................................. 5

1.5.4.1 Receiver..................................................................................................................................... 5

1.5.4.2 Acquisition Times ..................................................................................................................... 5

1.5.4.3 Update Rate............................................................................................................................... 5

1.5.4.4 Accuracy................................................................................................................................... 5

1.5.5 Interfaces............................................................................................................................................... 6

1.5.5.1 GPS 15H & 15L Electrical Characteristics................................................................................ 6

1.5.5.2 Port 1 Protocols ......................................................................................................................... 6

1.5.5.3 Port 2 Protocols ......................................................................................................................... 6

1.5.5.4 PPS............................................................................................................................................ 6

1.5.6 Antenna Specifications.......................................................................................................................... 6

2 GPS 15H & 15L Wire Descriptions and Wiring Diagrams .....................................8

2.1 GPS 15H & 15L Wire Descriptions..................................................................................................8

2.2 GPS 15H & 15L Wiring Diagrams...................................................................................................9

3 Mechanical Characteristics & Mounting.................................................................10

4 GPS 15H & 15L Software Interface.........................................................................11

4.1 Received NMEA 0183 Sentences...................................................................................................11

4.1.1 Almanac Information (ALM)...............................................................................................................11

4.1.2 Sensor Initialization Information (PGRMI)..........................................................................................12

4.1.3 Sensor Configuration Information (PGRMC)......................................................................................12

4.1.4 Additional Sensor Configuration Information (PGRMC1) ..................................................................13

4.1.5 Output Sentence Enable/Disable (PGR MO) ........................................................................................13

4.1.6 Tune DGPS Beacon Receiver (PSLIB)................................................................................................14

4.2 Transmitted NMEA 0183 Sentences...............................................................................................15

4.2.1 Sentence Transmission Rate.................................................................................................................15

4.2.2 Transmitted Time.................................................................................................................................16

4.2.3 Global Positioning System Almanac Data (ALM)...............................................................................16

4.2.4 Global Positioning System Fix Data (GGA)........................................................................................16

4.2.5 GPS DOP and Active Satellites (GSA)................................................................................................17

4.2.6 GPS Satellites in View (GSV)..............................................................................................................17

4.2.7 Recommended Minimum Specific GPS/TRANSIT Data (RMC)........................................................17

4.2.8 Track Made Good and Ground Speed (VTG)......................................................................................17

4.2.9 Geographic Position (GLL)..................................................................................................................18

4.2.10 Estimated Error Information (PGRME)...............................................................................................18

4.2.11 GPS Fix Data Sentence (PGRMF).......................................................................................................18

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

Page iii

4.2.12 Map Datum (PGRMM)........................................................................................................................18

4.2.13 Sensor Status Information (PGRMT)...................................................................................................19

4.2.14 3D velocity Information (PGRMV).....................................................................................................19

4.2.15 DGPS Beacon Information (PGRMB).................................................................................................19

4.3 Baud Rate Selection........................................................................................................................20

4.4 One-Pulse-Per-Second (PPS) Output..............................................................................................20

4.5 Received RTCM Data.....................................................................................................................20

Appendix A: Earth Datums............................................................................................21

Appendix B: Binary Phase Output Format...................................................................24

Satellite Data Record .......................................................................................................................................24

Position Record................................................................................................................................................26

Receiver Measurement Record........................................................................................................................26

Sample C Code ................................................................................................................................................27

Appendix C: Changing the Baud Rate in Garmin Mode.............................................28

Appendix D: Ephemeris Data Download (Programming Example)...........................29

Synopsis...........................................................................................................................................................29

Garmin Binary Format Review........................................................................................................................29

Ephemeris Download Procedure......................................................................................................................30

TX Packet: Ephemeris Data Request .......................................................................................................30

RX Packet: Acknowledgement ................................................................................................................30

RX Packet: Number of Data Packets to Expect........................................................................................30

TX Packet: Acknowledgement.................................................................................................................30

RX Packet: Ephemeris Data.....................................................................................................................31

TX Packet: Download Complete..............................................................................................................33

Appendix E: Declaration of Conformity........................................................................34

LIST OF TABLES AND FIGURES

Table 1: Gain vs. SNR for Given Noise Figure.............................................................................................. 7

Table 2: GPS 15H & 15L Wire Descriptions................................................................................................. 8

Figure 1: Computer Serial Port Interconnection............................................................................................. 9

Figure 2: PDA Serial Port Interconnection..................................................................................................... 9

Figure 3: Basic NMEA Device Interconnection............................................................................................. 9

Figure 4: GPS 15H-F & 15L-F Dimensions................................................................................................. 10

Figure 5: GPS 15H-W & 15L-W Outline Drawing...................................................................................... 10

Table 3: NMEA 0183 Output Sentence Order and Size...............................................................................15

Table 4: Characters per Second for Available Baud Rates........................................................................... 15

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

Page iv

1 INTRODUCTION

1.1 CAUTIONS

Caution

The GPS system is operated by the government of the United States, which is solely responsible for its
accuracy and maintenance. Although the GPS 15H & 15L sensors are precision electronic NAVigation
AIDs (NAVAID), any NAVAID can be misused or misinterpreted, and therefore become unsafe. Use these
products at your own risk. To reduce the risk, carefully review and understand all aspects of these
Technical Specifications before using the GPS 15H & 15L. When in actual use, carefully compare
indications from the GPS to all available navigation sources including the information from other
NAVAIDs, visual sightings, charts, etc. For safety, always resolve any discrepancies before continuing
navigation.

FCC

Compliance

The GPS 15H & 15L sensors comply with Part 15 of the FCC interference limits for Class B digital devices
FOR HOME OR OFFICE USE. These limits are designed to provide reasonabl e pr ot ect i on agai nst har mful
interference in a residential installation, and are more stringent than “outdoor” requirements.

Operation of this device is subject to the following conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received, including interference that may
cause undesired operation.

This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radi o communications. However, there
is no guarantee that interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or televisio n recept i on , whi ch can be determined by turning the equipment of f
and on, the user is encouraged to try to correct the interference by one or more of the following measures:

•

Reorient or relocate the receiving antenna.

•

Increase the separation between the equipment and receiver.

•

Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.

•

Consult the dealer or an experienced radio/TV technician for help.

The GPS 15H & 15L sensors do not contain any user-serviceable parts. Unauthorized repairs or
modifications could result in permanent damage to the equipment and void your warranty and your
authority to operate these devices under Part 15 regulations.

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

Page 1

1.2 LIMITED WARRANTY

This Garmin product is warranted to be free from defects in materials or workmanship for one year from
the date of purchase. Within this period, Garmin will at its sole option repair or replace any components
that fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts or
labor, provided that the customer shall be responsible for any transportation cost. This warranty does not
cover failures due to abuse, misuse, accident, or unauthorized alteration or repairs.

THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE E XCLUSIVE AND IN LIEU OF
ALL OTHER WARRANTIES EXPRESS OR IMPLIED OR STATUTORY, INCLUDING ANY
LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE, STATUTORY OR OTHERWISE. TH IS WARRANTY GIVES YOU
SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE.

IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR
CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE, OR
INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do not
allow the exclusion of incidental or consequential damages, so the above limitations may not apply to you.

Garmin retains the exclusive right to repair or replace the unit or software or offer a full refund of the
purchase price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE
REMEDY FOR ANY BREACH OF WARRANTY.

To obtain warranty service, contact your local Garmin authorized dealer or call Garmin Product Support at
one of the numbers listed below for shipping instructions and an RMA tracking number. The unit should be
securely packed with the tracking number clearly written on the
then be sent, freight charges prepaid, to any Garmin warranty service station. A copy of the original sales
receipt is required as the proof of purchase for warranty repairs.

outside of the package. The unit should

Garmin International, Inc.
1200 E 151st Street, Olathe, Kansas 66062 U.S.A.
Tel. [phone] or 800/800.1020
Fax. [phone]

Garmin (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9DL U.K.
Tel. [phone]
Fax [phone]

Online Auction Purchases: Products sold through online auctions are not eligible for rebates or other
special offers from Garmin. Online auction confirmations are not accepted for warranty verification. To
obtain warranty service, an original or copy of the sales receipt from the original retailer is required.
Garmin will not replace missing components from any package purchased through an online auction.

International Purchases: A separate warranty is provided by international distributors for units purchased
outside the United States. This warranty is provided by the local in-country distributor and this distributor
provides local service for your unit. Distributor warranties are only valid in the area of intended
distribution. Units purchased in the United States or Canada must be returned to the Garmin service center
in the United Kingdom, the United States, Canada, or Taiwan for service.

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

Page 2

1.3 OVERVIEW

The GPS 15H & 15L are part of Garmin’s latest generation of GPS sensor boards designed for a broad
spectrum of OEM (Original Equipment Manufacture) system applications. Based on the proven technolo gy
found in other Garmin 12-channel GPS receivers, the GPS 15H & 15L track up to 12 satellites at a time
while providing fast time-to-first -fix, one-second navigation updates, and low power consumption. The
GPS 15H & 15L also provide the capability of FAA Wide Area Augmentation System (WAAS) differential
GPS. Their far-reaching capabilities meet the sensitivity requirements of land navigation, the timing
requirements for precision timing applications, as well as the dynamics requirements of high-performance
aircraft.

The GPS 15H & 15L designs utilize the latest technology and high-level circuit integration to achieve
superior performance while minimizing space and power requirements. Critical components of the system,
such as the digital baseband processor, were designed by Garmin to ensure that the GPS 15H & 15L
provide the quality, performance, and capabilities that you have grown to expect from Garmin GPS
receivers. The elegant hardware design, combined with software intelligence, makes the GPS 15H & 15L
easy to integrate and use.

Because they are complete GPS receivers, the GPS 15H & 15L require minimal additional components
from an OEM or system integrator. A minimum system must provide the GPS receiver with a source of
power, a GPS antenna, and a clear view of GPS satellites within the 1.5 GHz band. For optimum
performance, the GPS antenna should be an active antenna with a gain between 10 and 30 dB. If cost
constraints prevent the use of an active antenna, a well-matched, efficient, passive antenna attached by a
short cable can be used instead.

The system may communicate with the GPS 15H & 15L via two RS-232 compatible receive channels and
one transmit channel. The GPS 15H & 15L internal FLASH memory allows the GPS to retain critical data
such as satellite orbital parameters, last-known position, date and time. End-user interfaces such as
keyboards and displays are the responsibility of the application designer.

1.4 FEATURES

12-channel GPS receiver tracks and uses up to 12 satellites for fast, accurate positioning and low

•

power consumption.
Differential DGPS capability utilizing real-time WAAS or RTCM corrections yielding 3–5 meter

•

position accuracy (see section

•

Compact, rugged design ideal for applications with minimal space.

•

May be remotely mounted in an out-of-the-way location.

•

Receiver status information can be displayed directly on a chartplotter or PC.

•

User initialization is not required. Once installed and a fix is obtained, the unit automatically
produces navigation data.

•

User-configurable navigation mode (2-dimensional or 3-dimensional fix).

•

Highly accurate one-pulse-per-second (PPS) output for precise timing measurements. Pulse width
is configurable in 20 millisecond increments from 20 ms to 980 ms.

•

Configurable for binary format carrier phase data output on COM 1 port.

•

Flexible input voltage levels of 3.3 to 5.4 VDC (GPS 15L) or 8.0 to 40 VDC (GPS 15H).

•

Built-in backup battery to maintain real-time clock for up to 21 days. Provision for external power
to maintain the real-time clock for longer intervals.

•

FLASH-based program and non-volatile memory. New software revisions upgradeable through
Web site download and serial interface. Non-volatile memory does not require battery backup.

1.5.4.4).

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

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1.5 TECHNICAL SPECIFICATIONS

Specifications are subject to change without notice.

1.5.1 Physical Characteristics

1.5.1.1 Size

1.400” (35.56 mm) wide x 1.805” (45.8 5 mm) long x 0.327” (8.31 mm) high

1.5.1.2 Weight

•

GPS 15H: 0.53 oz. (15.0 g)

•

GPS 15L: 0.50 oz (14.1 g)

1.5.1.3 Available Connector Options

•

GPS 15H-F & 15L-F: 8-pin LIF (Low Insertion Force) flex connector, 1-millimeter pitch. For use

with common 1 mm pitch, 8-conductor flex cable, available as Garmin Part
Number 310-00040-01. This flex cable mates with common 1 mm pitch, 8­pin flex connectors, such as Garmin Part Number 330-00346-08 or Molex
Part Number 52793-0890. Refer to the Molex Web site at

• GPS 15H & 15L-W: 8-pin JST connector, 1-millimeter pitch. Mating wire harness includ ed

(Garmin Part Number 325-00118-01). The connector housing used on this
harness is equivalent to JST Part Number SHR-08V-S-B. The 8-wire crimp
socket is equivalent to JST Part Number SSH-003T-P0.2. Refer to the JST
Web site at

www.jst.com.

www.molex.com.

1.5.1.4 Antenna Connector

The GPS 15H & 15L sensors provide a MCX female connector for connection to an active GPS antenna, so
the antenna’s cable should be terminated in MCX male. A suitable antenna is Garmin’s GA 27C Antenna
(Garmin Part Number 010-10052-05). Other antennas that are terminated in male BNC connectors may be
adapted via a Garmin MCX to BNC Adapter Cable (Garmin Part Number 010-10121-00).

1.5.2 Electrical Characteristics

1.5.2.1 Input Voltage

•

GPS 15H: 8.0 VDC to 40 VDC unregulated

•

GPS 15L: 3.3 VDC to 5.4 VDC (must have less than 100 mV peak-to-peak ripple)

1.5.2.2 Input Current

•

GPS 15H: 60 mA peak, 50 mA nominal @ 8.0 VDC

40 mA peak, 33 mA nominal @ 12 VDC
15 mA peak, 12 mA nominal @ 40 VDC

•

GPS 15L: 100 mA peak, 85 mA nominal @ 3.3 to 5.0 VDC

1.5.2.3 GPS Receiver Sensitivity

-165 dBW minimum

1.5.3 Environmental Characteristics

•

Operating Temperature: -30°C to +80°C

•

Storage Temperature: -40°C to +90°C

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

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1.5.4 GPS Performance

1.5.4.1 Receiver

WAAS Enabled™, 12 parallel channel GPS receiver continuously tracks and uses up to 12 satellites (up to
11 with PPS active) to compute and update your position.

1.5.4.2 Acquisition Times

•

Reacquisition: Less than 2 seconds

•

Warm: Approx. 15 seconds (all data known)

•

Cold: Approx. 45 seconds (initial position, time, and almanac known; ephemeris unknown)

•

AutoLocate®: 5 minutes (almanac known; initial position and time unknown)

•

SkySearch: 5 minutes (no data known)

1.5.4.3 Update Rate

1 second default; NMEA 0183 output interval configurable from 1 to 900 seconds in 1-second increments.

1.5.4.4 Accuracy

•

GPS Standard Positioning Service (SPS)
Position: < 15 meters, 95% typical
Velocity: 0.1 knot RMS steady state

•

DGPS (USCG/RTCM)
Position: 3-5 meters, 95% typical
Velocity: 0.1 knot RMS steady state

•

DGPS (WAAS)
Position: < 3 meters, 95% typical
Velocity: 0.1 knot RMS steady state

•

PPS Time: ±1 microsecond at rising edge of PPS pulse (subject to Selective Availability)

•

Dynamics: 999 knots velocity (only limited at altitude greater than 60,000 feet), 6g dynamics

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

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1.5.5 Interfaces

1.5.5.1 GPS 15H & 15L Electrical Characteristics

True RS-232 output (Port 2 output not used at time of publication), asynchrono us serial input

•

compatible with RS-232 or TTL voltage levels, RS-232 polarity.
User selectable NMEA 0183 baud rate (300, 600, 1200, 2400, 4800, 9600, 19200, 38400). Factory

•

setting is 4800 baud.

1.5.5.2 Port 1 Protocols

•

Configurable between NMEA 0183 Versions 2.00 and 3.00.

•

ASCII output sentences: GPALM, GPGGA, GPGLL, GPGSA, GPGSV, GPRMC, and GPVTG
(NMEA-approved sentences); and PGRMB, PGRME, PGRMF, PGRMM, PGRMT, and PGRMV
(Garmin proprietary sentences).

•

NMEA 0183 Outputs (see section 4.2 for full protocol specifications)
Position, velocity and time
Receiver and satellite status
Differential Reference Station ID and RTCM Data age
Geometry and error estimates

NMEA 0183 Inputs (see section 4.1 for full protocol specifications)

•

Initial position, date and time (not required)
Earth datum and differential mode configuration command, PPS Enable, GPS satellite almanac

• Config ura bl e for bi nary dat a output including GPS carrier phase data

1.5.5.3 Port 2 Protocols

Real-time Differential Correction input (RTCM SC-104 message types 1, 2, 3, 7, and 9)

1.5.5.4 PPS

1 Hz pulse, programmable width, 1 μs accuracy

1.5.6 Antenna Specifications

Should be an active antenna with the following specifications:
Gain: Antenna should provide between 10 dB to 30 dB net gai n be t ween the

antenna feed point and the connection to the GPS 15H & 15L. Consider all
amplifier gains, filter losses, cable losses, etc. when calculating the gain.

RF Connection: GPS 15H & 15L RF Connection: MCX Female connector (on the GPS

15H & 15L board).
Antenna Connection: MCX Male connector (on the end of the antenna
cable).

Garmin Antenna: GPS 27C (Garmin Part Number 010-10052-05) provides the required

MCX Male connector. Other Garmin antennas terminated in a BNC Male
connector may also be used if a Garmin MCX to BNC Adapter Cable
(Garmin Part Number 010-10121-00) is used. Place the MCX to BNC
Adapter Cable between the connector on the end of the antenna cable and
the connector on the GPS 15H & 15L.

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

Page 6

Noise Figure/Gain: The total noise figure on the external antenna must be ≤ 7 dB. Refer to the

table below.

18.0

17.0

16.0

15.0

14.0

SNR (dB)

13.0

12.0

11.0

10.0

10.0 15.0 20.0 25.0 30.0 35.0 40.0

Gain (dB)

NF=1.3dB NF=2.3dB NF=3.3dB NF=4.3dB NF=5.3dB NF=6.3dB NF=7.3dB

Table 1: Gain vs. SNR for Given Noise Figure

Properly bias the antenna from an on-board source or an external source:
Bias voltage from on-board source: GPS 15H supplies 3.3 VDC to the center conductor of the MCX

female, relative to the connector shell ground.

GPS 15L supplies 3.0 VDC to the center conductor of the MCX

female, relative to the connector shell ground

In both the GPS 15H and 15L, the source resistance of the DC supply to the center conductor of the

connector is approximately 10 Ohms, which is included as a current
limiting resistance. This resistance allows the receiver to survive
momentary shorting of the antenna port.

The GPS 15H and 15L sensors with serial numbers between 27700000

and 28099999 can detect if the antenna is shorted. GPS 15H and 15L
sensors no in the serial number range listed above do not have a

provision to protect against a continuously shorted antenna port.
The antenna must not draw more than 60 mA.
Bias voltage from external source: 4.0 to 8.0 VDC bias through the series combination of an on-board

~10 Ohm current limiting resistance and a Schottky diode.
The antenna must not draw more than 60 mA.

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

Page 7

2 GPS 15H & 15L WIRE DESCRIPTIONS AND WIRING DIAGRAMS

The GPS 15H-F & 15L-F use an eight-contact flex circuit LIF (low insertion force) connector. The GPS
15H-W & 15L-W use an eight-pin JST connector (mating wire harness included). See section

1.5.1.3.

2.1 GPS 15H & 15L WIRE DESCRIPTIONS

Pin # Signal Name Description

1 BACKUP

POWER

2 GROUND Power and Signal Ground
3 POWER GPS 15L: +3.3 to +5.4 VDC (±100 mV ripple) input. Peak operating current is

4 PORT 1

DATA OUT

5 PORT 1

DATA IN

6 RF BIAS This input allows the user to supply an external RF bias voltage in the range of 4

This input provides external power to maintain the real-time clock. This enables
the user to provide backup power if needed for longer than the on-board backup
battery provides (roughly 21 days). Input voltage must be between +2.8 and +3.4
VDC.

100 mA. Nominal operating current is 85 mA. This voltage drives an LDO with a
nominal 3.0 VDC output.
GPS 15H: Unregulated 8.0 to 40 VDC input. Peak operating current is 40 mA @
12 VDC input. Nominal operating current is 33 mA @ 12 VDC input. This
voltage drives a switching regulator with a nominal 3.3 VDC output. Although a
regulated supply is not required, the peak-to-peak voltage ripple on this line
should be kept to less than 100 mV.
Serial Asynchronous Output
RS-232 compatible output normally provides serial data which is formatted per
NMEA 0183, Version 2.0. This output is also capable of outputting phase data
information; see
NMEA 0183 baud rate is selectable in the range of 300 to 38400 baud. The default
baud rate is 4800.
First Serial Asynchronous Input
RS-232 compatible with maximum input voltage range of -25 < V < 25. This
input may also be directly connected to standard 3 to 5 VDC CMOS logic that
utilizes RS-232 polarity. The low signal voltage requirement is < 0.6 V, and the
high signal voltage requirement is > 2.4 V. Minimum load impedance is 500 Ω.
This input may be used to receive serial initialization/ configuration data as
specified in section

VDC to 8 VDC to the active antenna. The voltage should be from a clean,
regulated supply and should be well isolated from potential sources of
interference. The supply should not share RF current paths with other system
devices such as microprocessors or other RF circuits. By default, the unit uses an
internal voltage to power the active antenna.

Appendix B: Binary Phase Output Form at for details. The

4.1 Received NMEA 0183 Sentences.

Note: This pin is only operational on units whose serial numbers are higher than
the serial numbers given below:
010-00240-01 GPS 15H-W serial no. 81301857
010-00240-02 GPS 15L-W serial no. 81408976
010-00240-11 GPS 15H-F serial no. 81901632
010-00240-12 GPS 15L-F serial no. 82001471

7 PPS One-Pulse-Per-Second Output

Typical voltage rise and fall times are 100 ns. Impedance is 250 Ω. The open
circuit output voltage toggles between the low (0 V) and the high (3.3 V for 15H
and 3.0 V for 15L). The default format is a 100 ms wide active-high pulse at a
1 Hz rate, with the pulse width configurable in 20 ms increments. Rising edge is
synchronized to the start of each GPS second. This output provides a nominal 450
mVp-p signal into a 50 Ω load. The pulse time measured at the 50% voltage point
will be approximately 15 ns earlier with a 50 Ω load than with no load.

8 PORT 2

DATA IN

190-00266-01 GPS 15H & 15L Technical Specifications Rev. D

Second Serial Asynchronous Input
This input may be used to receive serial differential GPS data formatted per

RTCM SC-104 Recommended Standards For Differential Navstar GPS Service,
Version 2.2 (see section

Table 2: GPS 15H & 15L Wire Descriptions

4.5 for more details).

Page 8