Hemisphere GPS Crescent Vector H220 Assembly Instructions

875-0384-0
Integrator Guide
Crescent
®
Vector™
H220 Board
Revision: A1
November 01, 2017

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This device complies with part 15 of the FCC Rules. Operation is subject to the following two 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productcomplieswiththeessentialrequirementsandotherrelevantprovisionsofDirective2014/53/EU.Thedeclarationofconformitymaybe
consultedathttps://hemispheregnss.com/About‐Us/Quality‐Commitment.
Copyright Notice
Copyright Hemisphere GNSS, Inc. (2017). 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 GNSS.
Trademarks
Hemisphere GNSS®, the Hemisphere GNSS logo, TRACERTM, Crescent®, EclipseTM, e-Dif®, L-DifTM,
miniEclipseTM, PocketMax3 PCTM, PocketMax3TM, PocketMax3TM, S320TM, SBX-4TM, VectorTM,
XF1TM,and XF2TM are proprietary trademarks of Hemisphere GNSS, Inc. Other trademarks are the
properties of their respective owners.
Patents
Hemisphere GNSS products may be covered by one or more of the following patents:
U.S. Patents
Australia Patents
6111549 6876920 7400956 8000381 8214111 2002244539
6397147 7142956 7429952 8018376 8217833 2002325645
6469663 7162348 7437230 8085196 8265826 2004320401
6501346 7277792 7460942 8102325 8271194
6539303 7292185 7689354 8138970 8307535
6549091 7292186 7808428 8140223 8311696
6711501 7373231 7835832 8174437 8334804
6744404 7388539 7885745 8184050 RE41358
6865465 7400294 7948769 8190337
Other U.S. and foreign patents pending.
Notice to Customers
Contact your local dealer for technical assistance. To find the authorized dealer
near you:
Hemisphere GNSS, Inc
8515 East Anderson Drive
Scottsdale, AZ 85255 USA
Phone: [phone]
Fax: [phone]
[e-mail]
www.hgnss.com
Technical Support
If you need to contact Hemisphere GNSS Technical Support:
Hemisphere GNSS, Inc.
8515 East Anderson Drive
Scottsdale, AZ 85255 USA
Phone: [phone]
Fax: [phone]
[email protected]
Documentation Feedback
Hemisphere GNSS is committed to the quality and continuous improvement of our products and
services. We urge you to provide Hemisphere GNSS with any feedback regarding this guide by writing
to the following email
address: [e-mail].

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Table of Contents
Copyright Notice ............................................................................................................................................. i
Trademarks .................................................................................................................................................... i
Patents ........................................................................................................................................................... i
Notice to Customers ....................................................................................................................................... i
Technical Support .......................................................................................................................................... i
Documentation Feedback .............................................................................................................................. i
Chapter 1: Introduction .................................................................................................................................. 1
Introduction ................................................................................................................................................... 2
Product Overview and Features .................................................................................................................. 2
H220 OEM Board Options ........................................................................................................................... 3
What’s Included ........................................................................................................................................... 3
Integrating the H220 .................................................................................................................................... 3
Features of the H220 ................................................................................................................................... 4
Configuring the H220 ................................................................................................................................... 4
Message Interface ....................................................................................................................................... 5
Using PocketMax4 to Communicate with the H220 .................................................................................... 5
Chapter 2: Board Overview ........................................................................................................................... 6
Board Overview ............................................................................................................................................. 7
H220 OEM Board Key Features .................................................................................................................. 7
Mechanical Layout ..................................................................................................................................... 10
Connectors ................................................................................................................................................ 11
Mounting Options ...................................................................................................................................... 11
Direct Electrical Connection Method .................................................................................... 11
Indirect Electrical Connection (Cable) Method ..................................................................... 11
Header Layouts and Pinouts ..................................................................................................................... 12
Signals ....................................................................................................................................................... 14
RF Input ................................................................................................................................ 14
Serial Ports ........................................................................................................................... 14
Communication Port D .......................................................................................................... 14
LED Indicators ...................................................................................................................... 15
1 PPS Timing Signal ............................................................................................................. 15
Event Marker Input ............................................................................................................... 16
Grounds ................................................................................................................................ 16
Speed Radar Output ............................................................................................................. 16
Shielding .................................................................................................................................................... 17
Receiver Mounting ..................................................................................................................................... 18

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Mounting the Antennas .............................................................................................................................. 1 8
Mounting Orientation ................................................................................................................................. 18
H220 Orientation and Sensor Calibration .................................................................................................. 18
Planning the Optimal Antenna Placement ................................................................................................. 23
Connecting the Antennas to the H220 ...................................................................................................... 23
Thermal Concerns ..................................................................................................................................... 23
Chapter 3: Setup and Configuration ........................................................................................................... 24
Setup and Configuration ............................................................................................................................. 25
Powering the H220 .................................................................................................................................... 25
Communicating with the H220 ................................................................................................................... 25
Configuring the H220 ................................................................................................................................. 25
Firmware .................................................................................................................................................... 25
Configuring the Data Message Output ...................................................................................................... 26
‘THIS’ Port and the ‘OTHER’ Port ............................................................................................................. 26
Saving the H220 Configuration .................................................................................................................. 26
Configuration Defaults ............................................................................................................................... 27
Appendix A: Frequently Asked Questions .................................................................................................. A1
Integration .................................................................................................................................................. A2
Support and Repair ................................................................................................................................... A3
Power, Communication, and Configuration ............................................................................................... A3
GNSS Reception and Performance .......................................................................................................... A5
SBAS Reception and Performance ........................................................................................................... A5
External Corrections .................................................................................................................................. A6
Installation .................................................................................................................................................. A6
Appendix B: Troubleshooting ...................................................................................................................... B1
Appendix C: Technical Specifications ........................................................................................................ C1


H220 Integrator Guide Chapter 1 - Introduction Page 1 of 28
Chapter 1: Introduction
Product Overview and Features
H220 Board Options
What’s Included
Integrating the H220
Features of the H220
Configuring the H220
Message Interface
Using PocketMax4 to Communicate with the H220

H220 Integrator Guide Chapter 1 - Introduction Page 2 of 28
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Introduction
The Crescent® Vector™ H220 GNSS OEM board is the next generation, single-frequency, high-
performance GNSS heading, positioning, and altitude module available from Hemisphere GNSS.
The H220 provides integrators with an opportunity for developing sophisticated marine, navigation,
and land applications in challenging, dynamic environments. The H220 uses Hemisphere’s
advancements in Vector technology, advanced multipath mitigation techniques, and Hemisphere’s
patented Multifunction Application.
H220 is capable of providing heading of 0.04° with a 5-meter antenna baseline and either RTK or
SBAS positioning depending on your location requirements. With Atlas corrections, the H220 can
obtain instant submeter accuracy worldwide while being more robust than SBAS even in SBAS
regions.
Integrate the robust H220 GNSS OEM board into your applications to experience exceptional heading,
positioning, and attitude performance in a compact size. Diversity and cost savings make it an ideal
part of your solution for system integrators.
Product Overview and Features
Designed with a new hardware platform, it offers true scalability with centimeter-level accuracy in either
single-frequency mode or Atlas-capable mode that supports fast RTK initialization times over long
distances. The H220 offers fast accuracy heading of better than 0.30 degrees at 0.5 m
antenna separation in ideal conditions and aiding gyroscope and tilt sensors for temporary GNSS
outages. The 109-mm x 71 mm module with 34-pin header is a drop-in upgrade for existing designs
using the H200.
The latest technology platform enables simultaneous tracking of all L1 constellations including
GPS, GLONASS, BeiDou, Galileo, and QZSS, making it robust and reliable. The updated power
management system efficiently governs the processor, memory, and ASIC, making it ideal for
multiple integration applications. The H220 offers flexible and reliable connectivity by supporting
Serial, USB, and CAN for ease-of-use and integration. Optional output rates of up to 50 Hz are also
supported.
Advanced Technology Features
The H220 offers integrated L-band support for Atlas corrections providing global sub-meter
position accuracy while Hemisphere’s Tracer™ technology helps maintain position during
correction signal outages.
Fitted with Hemisphere’s patented Crescent receiver technology, the H220 computes heading and
DGPS position using L1 GPS,GLONASS, BeiDou, Galileo and QZSS. Develop robust marine
navigation and land solutions in a world full of complex dynamic environments through Hemisphere
GNSS’ advancements in Vector technology. The H220 brings a series of new features to the
patented Crescent Vector technology including a more robust heading solution and excellent
positioning through RTK. The H220 outputs heading, pitch, and roll.
Note: Throughout the rest of this manual, the Crescent® Vector™ H220 OEM board is referred to
simply as the H220.

H220 Integrator Guide Chapter 1 - Introduction Page 3 of 28
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H220 OEM Board Options
The H220 is available in the hardware configuration shown in Table 1-1.
Table 1.1 H220 OEM Board Options
Model GNSS Systems L-band
H220™ L1 GPS, GLONASS, BeiDou, Galileo and
QZSS
Yes
What’s Included
The H220 is available in two configurations:
 H220 OEM board only - designed for integrators who are familiar with H220 OEM board
integration
 H220 OEM board and Universal Development Kit - designed for integrators who are
new to H220 integration (assembly required: OEM board and Universal Development kit
sold separately)
The Universal Development Kit is designed to work with various Hemisphere OEM boards and
includes an enclosure with carrier board, adapter boards, and various cables.
For more information on the Universal Development Kit go to www.hemispheregnsss.com and
navigate to the Precision OEM Products page.
Integrating the H220
Successful integration of the H220 within a system requires electronics expertise that includes:
 Power supply design
 Serial port level translation
 Reasonable radio frequency competency
 An understanding of electromagnetic compatibility
 Circuit design and layout

H220 Integrator Guide Chapter 1 - Introduction Page 4 of 28
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The H220 GNSS engine is a low-level module intended for custom integration with the following
general integration requirements:
 Regulated power supply input (3.3 VDC ± 5%) and 1.7 mA continuous current
 Low-level serial port (3.3 V CMOS) and USB port communications
 Radio frequency (RF) input to the engine from a GNSS antenna is required to be actively
amplified (10 to 40 dB gain)
 GNSS antenna is powered with a separate regulated voltage source up to 15 VDC
maximum
 Antenna input impedance is 50 Ω
 Antenna voltage input is 15 VDC maximum
 Antenna gain input range is 10 to 40 dB
Features of the H220
Some notable features of the H220 are:
 Multi-channel GNSS engine (12 L1CA GPS, 12 L1P GPS, 12 L1 GLONASS, 22 B1
BeiDou, 12 E1 Galileo, 4 L1 QZSS and 3 channels dedicated to SBAS tracking)
 Sub-meter horizontal accuracy 95%
 Raw measurement output (via documented binary messages)
 Position and heading update rates of 50 Hz maximum
 Quick times to first fix
 Four full-duplex serial ports, a dedicated RTCM input port, and two USB ports (one USB
host, one USB device)
 1 CAN NMEA2000, ISO-11783
 1 PPS timing output
 Event marker input
 L-band capable
 Fast RTK acquisition and reacquisition times
 10 cm RTK-enabled heave accuracy
 Improved heading accuracy with different baseline lengths (up to 5 m)
 Same form factor as Hemisphere GNSS' Crescent® Vector II OEM board
Note: See Appendix B, Technical Specifications for complete H220 specifications.
Configuring the H220
The H220 has four communication ports: A, B, C, and D. Ports A, B, and C are fully independent
and can have different messages output at different rates. You can configure each of these ports
for external correction input or output binary message information or RTCM corrections from an
outside source. You can also configure the output of ports A, B, or C through any of these ports.
Configure the baud rates if necessary; the default is 19200 for Ports A, B, and C.
Port D is reserved for RTCM differential corrections and may be used by the Hemisphere
GNSSSBX-4™ board (not included with H220).
You can configure the H220 to use the following differential operation modes:
 SBAS
 Beacon (with optional SBX-4 board)
 L-band
 External corrections

H220 Integrator Guide Chapter 1 - Introduction Page 5 of 28
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Message Interface
The H220 uses a NMEA 0183 interface, allowing you to easily make configuration changes by
sending text-type commands to the receiver.
The H220 also supports a selection of binary messages. There is a wider array of information
available through the binary messages, plus binary messages are inherently more efficient with
data. If the application has a requirement for raw measurement data, this information is available
only in a binary format.
For more information on NMEA 0183 commands and messages as well as binary messages refer
to the Hemisphere GNSS Technical Reference Guide.
Using PocketMax4 to Communicate with the H220
Hemisphere’s PocketMax4 is a free utility program that runs on your Windows PC or Windows
mobile device.
Simply connect your Windows device to the H220 via the COM port and open PocketMax4.
The screens within PocketMax4 allow you to easily interface with the H220 to:
 Select the internal SBAS, external beacon, or RTCM correction source
and monitor reception (beacon optional)
 Configure GNSS message output and port settings
 Record various types of data
 Monitor the H220 status and function
PocketMax4 is available for download from the Hemisphere GNSS website.

H220 Integrator Guide Chapter 2
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Chapter 2: Board Overview
H220 OEM Board Key Features
Mechanical Layout
Connectors
Mounting Options
Header Layouts and Pinouts
Signals
Shielding
Receiver Mounting
Mounting the Antennas
Mounting Orientation
H220 Orientation and Sensor Calibration
Planning the Optimal Antenna Placement
Connecting Antennas to the H220
Thermal Concerns

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Board Overview Page 7 of 28
Board Overview
H220 OEM Board Key Features
With small form factor, low power consumption, and simple on-board firmware, the H220 is an
ideal solution for integrators, offering scalability and expandability from L1 GPS with SBAS to
multi- frequency GPS, GLONASS, BeiDou, Galileo and QZSS (with RTK capability).
H220 is offered in the H200 form factor (109L x 71W mm) with integrated L-band. The reliable
positioning performance of H220 is further enhanced by RTK, Atlas corrections, aRTK, and
TRACER™ technology. The dual antenna H220 provides fast accuracy heading and with on-
board gyro and tilt sensor continues to provide heading during short GNSS outages.
With multi-GNSS RTK experience centimeter level accuracy and fewer RTK dropouts in
congested environments, faster reacquisition, and more robust solutions due to better cycle slip
detection.

H220 Integrator Guide Chapter 2
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Atlas L-band
Atlas L-band corrections are available worldwide. With Atlas, the positioning accuracy does not
degrade as a function of distance to a base station, as the data content is not composed of a
single base station’s information, but an entire network’s information. Atlas L-band is
Hemisphere's industry leading correction service, and can be added as a subscription.
Atlas L-band has the following benefits:
 Positioning accuracy - Competitive positioning accuracies down to 30 cm RMS in
certain applications
 Positioning sustainability - Cutting edge position quality maintenance in the absence
of correction signals, using Hemisphere’s patented technology
 Scalable service levels - Capable of providing virtually any accuracy, precision and
repeatability level in the 30 to 100 cm range
 Convergence time - Industry-leading convergence times of 10-40 minutes
H220 is supported by our easy-to-use Atlas Portal https://www.atlasgnss.com/ which empowers
you to update firmware and enable functionality, including Atlas subscriptions for accuracies
from meter to sub-decimeter levels.
For more information about Atlas L-band, see: http://hgnss.com/Atlas.
aRTK Position Aiding
aRTK is an innovative feature available in Hemisphere’s H220 that greatly mitigates the impact
of land-based communication instability. Powered by Hemisphere’s Atlas L-band system
service, aRTK augments the ability to maintain an RTK solution when the original RTK data link
is lost or interrupted. The aRTK provides an additional layer of communication redundancy to
RTK users, assuring that productivity is not impacted by intermittent data connectivity.
H220 receives aRTK augmentation correction data over satellite, while also receiving the land-
based RTK correction data. The receiver internally operates with two sources of RTK correction,
creating one additional layer of correction redundancy as compared to typical RTK systems.
After a few seconds , the process is established, and the receiver can operate in the absence of
either correction source, and the receiver is able to continue generating RTK positions in case
the land-based RTK correction source becomes unavailable.

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Tracer™
Most accurate positioning tech-niches such as RTK and Atlas (Hemisphere’s L-band global
correction service) operate by using a correction data stream source.
Positioning methods are limited due to constant connectivity requirements with the correction
source. In most cases, the GNSS engine needs to receive correction data with very low data
interruption to maintain a reasonable position accuracy. For example, certain systems in the
GNSS market only allow as much as 10 to 20 seconds of signal interruption before RTK level
accuracy solution completely stops.
Tracer is a core feature used in Hemisphere GNSS products to sustain positioning in the
absence of corrections. With the use of specialized algorithms, Tracer™ greatly mitigates the
impact of correction loss on the system positioning accuracy.
Tracer is essential in an environment where connectivity over satellite, radio, or internet is
unstable, as it allows most users to operate with negligible loss of accuracy during outage
periods. The length of the outage and associated performance loss varies with the positioning
technique used and the satellite geometry and interference environment.

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Mechanical Layout
Figure 2-1 shows the mechanical layout for the H220 OEM board. All dimensions are in
millimeters.
Figure 2-1: H220 Mechanical Layout

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Connectors
Table 2-1 describes the H220’s connectors and the mating connectors. You can use different
compatible connectors; however, the requirements may be different. The antenna input
impedance is 50 Ω.
Table 2-1: H220 Connectors
Connector H220 SMT Connector Mating Connector
RF MCX, straight jack (female)
(Molex 73415-1692)
MCX, straight plug (male)
(AMP: 1061015-1)
Interface 17x2 pin header plug (male)
0.05 in (1.27 mm) pitch
(Samtec: FTSH-117-04-G-DV-P-TR)
17x2, SMT header socket (female)
0.05 in (1.27 mm) pitch
(Samtec: FLE-117-01-G-DV)
Mounting Options
There are two options for mounting the H220:
 Direct Electrical Connection method
 Indirect Electrical Connection (Cable) method
Direct Electrical Connection Method
Place an RF connector, heading connector, and mounting holes on the carrier board and then
mount the H220 on the standoffs and RF header connectors. This method is very cost effective
as it does not use cable assemblies to interface the OEM board.
The H220 uses a standoff height of 0.79 cm (0.3125 in). With this height, there should be no
washers between either the standoff and the H220 or the standoff and the carrier board;
otherwise, you must make accommodations. You may need to change the standoff height if you
select a different header connector.
If you want to use a right angle MCX connector, use a taller header than the Samtec part number
that Hemisphere suggests. This will provide clearance to have a right-angle cable-mount
connector and reduce the complexity by not having the carrier board handle the RF signals. See
Table 2-1 on for H220 connector information.
The mounting holes of the H220 have a standard inner diameter of 0.32 cm (0.125 in).
Indirect Electrical Connection (Cable) Method
The second method is to mount the H220 mechanically, so you can connect a ribbon power/data
cable to the H220. This requires cable assemblies and there is a reliability factor present with
cable assemblies in addition to increased expense.
Note: Be aware of the GPS RF signals present on the carrier board and ensure the correct
standoff height to avoid any flexual stresses on the board when fastening.

H220 Integrator Guide Chapter 2
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Header Layouts and Pinouts
The H220 uses a dual-row 34-pin (17 pins x 2 rows) header connector to interface with power,
communications, and other signals.
To identify the first header pin, orient the board so the diamond is to the upper left of the pins; the
first pin is on the left directly below the diamond (see Figure 2-2). The pins are then sequentially
numbered per row from top to bottom.
Figure 2-2: Identifying the First Pin on the Header Connector

H220 Integrator Guide Chapter 2
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Board Overview Page 13 of 28
Table 2-2: H220 34-Header Pin-Out
Pin Name Type Description
1 3.3 V Power Receiver power supply, 3.3 V
2 3.3 V Power Receiver power supply, 3.3 V
3 Antenna Pwr Power Antenna power, DC, 5 V max
4 Batt Backup Power Backup power input (1.6 - 3.6 VDC, <5 µA consumption)
5 USB DEV+ I/O USB device data +
6 USB DEV– I/O USB device data -
7 GND Power Receiver ground
8 GND Power Receiver ground
9 PATX Output Port A serial output, 3.3 V CMOS, idle high
10 PARX Input Port A serial input, 3.3 V CMOS, idle high
11 PBTX Output Port B serial output, 3.3 V CMOS, idle high
12 PBRX Input Port B serial input, 3.3 V CMOS, idle high
13 PDTX Output Port D serial output, 3.3 V CMOS, idle high
14 PDRX Input Port D serial input, 3.3 V CMOS, idle high
15 1 PPS Output 1 PPS, 3.3 V CMOS, active high, rising edge
16 Manual mark Input 3.3 V CMOS, active low, falling edge
17 Master (primary) GPS
lock
Output Status indicator (M-GPS LED), 3.3 V CMOS, active low, 1 mA max,
optional connection
18 Differential lock Output Status indicator (DIFF LED), 3.3 V CMOS, active low, 1 mA max, optional
connection
19 DGPS position Output Status indicator (DGPS LED), 3.3 V CMOS, active low, 1 mA max,
optional connection
20 Alarm Output RTC alarm output
21 CANTX Output 3.3 V CMOS
22 Secondary GPS lock Output Status indicator (S-GPS LED), 3.3 V CMOS, active low, 1 mA max
23 CANRX Input 3.3 V CMOS
24 Heading lock Output Status indicator (HDG LED), 3.3 V CMOS, active low, 1 mA max
25 Speed radar pulse Output 0 - 3 V variable clock output
26 Speed radar ready signal Output Speed valid indicator, 3.3 V CMOS, active low
27 GND Power Receiver ground
28 GND Power Receiver ground
29 USB HOST + Output USB host data +
30 USB HOST – Output USB host data –
31 PCTX Output Port C serial output, 3.3 V CMOS, idle high
32 PCRX Input Port C serial input, 3.3 V CMOS, idle high
33 NC No connect
34 Reset Open
collector
Reset, open collector, 3.3 V typical, not required
Note: LeaveanydataorI/Opinsunconnectedifnotinuse.
TheH220OEMboard,theCrescentVectorIIOEMboard,andtheCrescentVectorOEMboarddifferfromtheirpredecessor,theVecto
r
OEM,inthattheydonothavepowersupplyorcommunicationtranslation:thismustbeaccomplishedbyacarrierboard.

H220 Integrator Guide Chapter 2
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Signals
This section provides more detail on the signals available via connectors.
RF Input
The H220 is designed to work with active GNSS antennas with a Low Noise Amplifier(LNA) gain
range of 10 to 40 dB. The purpose of the range is to accommodate for losses in the cable system.
Essentially, there is a maximum cable loss budget of 30 dB for a 40-dB gain antenna. Depending
on the chosen antenna, the loss budget will likely be lower (a 24-dB gain antenna would have a
14-dB loss budget).
When designing the internal and external cable assemblies and choosing the RF connectors, do
not exceed the loss budget; or you will compromise the tracking performance of the H220.
Serial Ports
The H220 has four UART serial communication ports, all 3.3V CMOS:
Port A
Pin 10 (RX), input
Pin 9 (TX), output
Port B
Pin 12 (RX), input
Pin 11 (TX), output
Port C
Pin 32 (RX), input
Pin 31 (TX), output
Port D - Exclusively used to interface with Hemisphere’s SBX™ beacon board or an external
corrections source. This port will not output normal GNSS-related NMEA messages. When
communicating into either Port A, B, or C, a virtual connection may be established to the device
on Port D using the $JCONN command. See “Communication Port D” for more information on
Port D.
Pin 14 (RX), input
Pin 13 (TX), output
If the serial ports which are 3.3V CMOS are used for external devices which utilize RS-232, an
RS-232 transceiver is required.
Communication Port D
The exclusive function of Port D is for external correction input to the H220. The source of
corrections may depend on the geographical use of your final product, market, customer, and
positioning performance requirements. If you intend to market products outside of SBAS
coverage, you may want to allow your product to be used with external correction input or
integrate a second source of corrections along with H220, such as the Hemisphere SBX beacon
module. For more information on SBAS refer to the Hemisphere GNSS Technical Reference
Guide.

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If used, Port D will free up the task of Port A, B, or C from being used for external correction input.
If you want to support external correction input when the product is in the field, Hemisphere
recommends that you offer the facility to the user to input corrections on Port A, B or C, and that
Port D remain within the integration only.
CAN
A CAN Transceiver is required. The H220 CAN RX and CAN TX are 3.3V CMOS signals. The
H220 connects to the transceiver on the single-ended CMOS port. CANH and CANL are CAN
standard signals on the physical bus side of the transceiver(the H220 does not connect to this
portion of the transceiver).
LED Indicators
The H220 features the following surface-mounted diagnostic LEDs that indicate board status (see
Figure 2-3):
 PWR – Power
 P-GNSS - Primary GNSS lock
 DIFF - Differential lock
 DGNSS - DGNSS position
 S-GNSS - Secondary GNSS lock
 HDG - Heading lock
Figure 2-3: Onboard LEDs
With the exception of the PWR LED the signals that drive the LEDs are available via the header
connector. Refer to Table 2-2 for pin number descriptions for the H220.
1 PPS Timing Signal
The one pulse per second (1 PPS) timing signal is used in applications where devices require
time synchronization.
Note: DGPS corrections are not required for heading accuracies as specified. External
corrections will only affect positioning performance.
Note: Each signal pin can offer only 1 mA of current and is active low. Since 1 mA of current
may be inadequate for the application, you may want to transistor-buffer these signals to
provide more current capacity for acceptable LED luminance.
Note: 1 PPS is typical of most GNSS boards but not essential to normal receiver
operation. Do not connect the pin if you do not need this function.

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The 1 PPS signal is 3.3 V CMOS active high with rising edge synchronization. The
1 PPS signal is capable of driving a load impedance greater than 10 kΩ in parallel with 10 pF.
The pulse is approximately 1 ms.
The H220 supports a programmable PPS. Users can select the frequency to 1,2,5 or 10Hz. The
H220 can support widths up to 900ms.
The width command parameter is in usec (microseconds).
$JPPS,RATE,<Rate_In_Hz (limited to 1.0 ,2.0 ,5.0 ,10.0 >,[SAVE]
or if you prefer to work with the period (inverse of RATE)
$JPPS,PERIOD,<Period in seconds (limited to 1.0, 0.5, 0.2, 0.1)
PPS Width can be controlled using
$JPPS,WIDTH,<width in usec>,[SAVE]
Note: $JSAVE does NOT save the JPPS configuration so the desired 1PPS configuration
settings must be applied every time the receiver is powered on.
Each parameter must be individually saved as it is entered (by adding the optional SAVE at the
end of the command).
Event Marker Input
A GNSS solution may need to be forced at a particular instance, not synchronized with GNSS
time depending on the application, such as identifying features during a bathymetric survey.
The event marker input is 3.3 V CMOS active low with falling edge synchronization. The input
impedance and capacitance is higher than 10 kΩ and 10 pF, respectively, with a threshold of
lower than 0.7 V required to recognize the input.
Grounds
You must connect all grounds together when connecting the ground pins of the H220. These are
not separate analog and digital grounds that require separate attention.
Refer to Table 2-2 for pinout ground information for the H220.
Speed Radar Output
Note: Speed radar output is not essential to normal receiver operation. Do not connect these pins
if you do not need this function.
Note: Event marker input is typical of most GNSS boards but not essential to normal
receiver operation. Do not connect this pin if you do not need this function.