Garmin GPS 18X User Manual

GPS 18x

TECHNICAL

SPECIFICATIONS

Garmin International, Inc.

1200 E. 151

Olathe, KS 66062 USA

190-00879-08, Revision B

January 2008

Street

Garmin International, Inc. 1200 East 151

Street, Olathe, Kansas 66062, U.S.A. Tel. 913/397.8200 or 800/800.1020 Fax 913/397.8282

Garmin (Europe) Ltd. Liberty House, Hounsdown Business Park, Southampton, Hampshire, SO40 9RB, U. K. Tel. +44 (0) 870.8501241 (outside the UK) 0808 2380000 (within the UK) Fax +44 (0) 870.8501251

Garmin Corporation No. 68, Jangshu 2

Road, Shijr, Taipei County, Taiwan Tel. 886/2.2642.9199 Fax 886/2.2642.9099

All rights reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded, or stored in any storage medium, for any purpose without the express prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of this manual must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.

Information in this document is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes or improvements. Visit the Garmin Web site (

www.garmin.com) for current updates and supplemental information

concerning the use and operation of this and other Garmin products. Garmin

, MapSource®, and WAAS Enabled® are registered trademarks of Garmin Ltd. or its subsidiaries and may

not be used without the express permission of Garmin. Windows® is a registered trademark of the Microsoft Corporation. Macintosh

is a registered trademark of Apple Inc.

Web site address: www.garmin.com

RECORD OF REVISIONS

Revision Revision

Description ECO #

Date

A 12/7/07 Initial Release -B 1/15/08 Revised and Redrawn 50283

190-00879-08 GPS 18x Technical Specifications Rev. B

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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 GPS 18x Series................................................................................................................................................4

1.5.1 GPS 18x USB.................................................................................................................................................... 4

1.5.2 GPS 18x PC ...................................................................................................................................................... 4

1.5.3 GPS 18x LVC, GPS 18x LVC-5m, and GPS 18x-5Hz ..................................................................................... 4

1.6 Technical Specifications..................................................................................................................................5

1.6.1 Physical Characteristics.....................................................................................................................................5

1.6.1.1 Size.................................................................................................................................................... 5

1.6.1.2 Weight............................................................................................................................................... 5

1.6.1.3 Color.................................................................................................................................................. 5

1.6.1.4 Case Material..................................................................................................................................... 5

1.6.1.5 Cable Length..................................................................................................................................... 5

1.6.2 Electrical Characteristics................................................................................................................................... 5

1.6.2.1 Input Voltage..................................................................................................................................... 5

1.6.2.2 Input Current..................................................................................................................................... 5

1.6.2.3 CMOS Serial Output Levels.............................................................................................................. 5

1.6.2.4 GPS Receiver Sensitivity .................................................................................................................. 5

1.6.2.5 Environmental Characteristics........................................................................................................... 6

1.6.3 GPS Performance.............................................................................................................................................. 6

1.6.3.1 Receiver............................................................................................................................................. 6

1.6.3.2 Acquisition Times............................................................................................................................. 6

1.6.3.3 Update Rate....................................................................................................................................... 6

1.6.3.4 Accuracy ........................................................................................................................................... 6

1.6.4 Interfaces........................................................................................................................................................... 6

1.6.4.1 GPS 18x Electrical Characteristics.................................................................................................... 6

1.6.4.2 Garmin Interface and Garmin USB Protocol..................................................................................... 6

1.6.4.3 GPS 18x PC, GPS 18x LVC, & GPS 18x-5Hz Protocols.................................................................. 7

1.6.4.4 Measurement Pulse Output (GPS 18x LVC & GPS 18x-5Hz only).................................................. 7

2 GPSx 18x LVC & GPS 18x -5Hz Wiring and Pinouts .........................................................8

2.1 GPS 18x LVC & GPS 18x -5Hz Pinout..........................................................................................................8

2.2 GPS 18x LVC & GPS 18x -5Hz Wiring Diagrams.........................................................................................8

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

4 GPS 18x PC, GPS 18x LVC, & GPS 18x-5Hz Software Interface....................................12

4.1 Received NMEA 0183 Sentences .................................................................................................................12

4.1.1 Almanac Information (ALM).......................................................................................................................... 12

4.1.2 Sensor Initialization Information (PGRMI).................................................................................................... 13

4.1.3 Sensor Configuration Information (PGRMC)................................................................................................. 13

4.1.4 Additional Sensor Configuration Information (PGRMC1) ............................................................................. 14

4.1.5 Output Sentence Enable/Disable (PGR MO) ................................................................................................... 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)................................................................................................... 17

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)................................................................... 18

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4.2.8 Track Made Good and Ground Speed (VTG)................................................................................................. 18

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

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

4.2.11 GPS Fix Data Sentence (PGRMF).................................................................................................................. 19

4.2.12 Map Datum (PGRMM)................................................................................................................................... 19

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

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

4.2.15 DGPS Beacon Information (PGRMB)............................................................................................................ 20

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

4.4 Measurement Pulse Output (GPS 18x LVC & 18x-5Hz only)......................................................................20

4.4.1 One-Pulse-Per-Second (PPS) Output (GPS 18x LVC Only)........................................................................... 20

4.4.2 Five-Pulse-Per-Second Output (GPS 18x-5Hz Only) ..................................................................................... 20

Appendix A: Earth Datum List..................................................................................................21

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

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

Appendix D: GPS 18x PC/ LVC/18x-5Hz & Windows Serial Mouse Issue...........................29

Appendix E: Sensor Configuration Software............................................................................31

Downloading the Sensor Configuration Software........................................................................................................... 31

Selecting a Model ........................................................................................................................................................... 31

Connecting to the Sensor................................................................................................................................................ 31

File Menu........................................................................................................................................................................ 32

Comm Menu................................................................................................................................................................... 32

Config Menu................................................................................................................................................................... 32

View Menu ..................................................................................................................................................................... 33

Help Menu...................................................................................................................................................................... 33

LIST OF TABLES AND FIGURES

Table 1: GPS 18x LVC & GPS 18x-5Hz Wire Pinout..................................................................................................8

Figure 1: Computer Serial Port Interconnection............................................................................................................8

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

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

Figure 4a. GPS 18x Bottom Case Dimensions, Under Mold.......................................................................................10

Figure 4b. GPS 18x Bottom Case, Outside of Casing.................................................................................................10

Figure 5. GPS 18x Suction Cup Mount Center Hole Dimensions...............................................................................11

Figure 6. GPS 18x Flush Mount Dimensions..............................................................................................................11

Figure 7. GPS 18x Flush Mount Center Hole Dimensions..........................................................................................11

Table 2: NMEA 0183 Output Sentence Order and Size..............................................................................................15

Table 3: Characters per Second for Available Baud Rates..........................................................................................15

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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 18x is a precision electronic NAVigation AID (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 18x. 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

This product has been tested and found to comply with Part 15 of the FCC interference limits for Class B digital devices FOR HOME OR OFFICE USE. These limits are designed to pr ovi de m ore reas onable protection against harmful 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 may cause harmful interference to radio communications if not installed and used in accordance with the instructions. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and the receiver.

• Connect the equipment into an outlet that is on a different circuit from the GPS unit.

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

This product does not contain any user-serviceable parts. Repairs should only be made by an authorized Garmin service center. Unauthorized repairs or modiﬁcations could result in permanent damage to the equipment, and void your warranty and your authority to operate this device under Part 15 regulatio ns.

190-00879-08 GPS 18x Technical Specifications Rev. B

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.

This product is intended to be used only as a travel aid and must not be used for any purpose requiring precise measurement of direction, distance, location, or topography. Garmin makes no warranty as to the accuracy or completeness of map data in this product.

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 PART I CULAR PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YO U SPECIF IC LE GAL 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 shown below for shipping instructions and an RMA tracking number. The unit should be securely packed with the tracking number clearly written on the 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 then be sent, freight

Garmin International, Inc. 1200 East 151

Street, Olathe, Kansas 66062, U.S.A. Tel. 913/397.8200 or 800/800.1020 Fax 913/397.8282

Garmin (Europe) Ltd. Liberty House, Hounsdown Business Park, Southampton, Hampshire, SO40 9RB, U. K. Tel. +44 (0) 870.8501241 (outside the UK) 0808 2380000 (within the UK) Fax +44 (0) 870.8501251

Garmin Corporation No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan Tel. 886/2.2642.9199 Fax 886/2.2642.9099

190-00879-08 GPS 18x Technical Specifications Rev. B

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1.3 OVERVIEW

The GPS 18x series products include an embedded receiver and an antenna. Based on the proven technology found in other Garmin GPS receivers, the GPS 18x tracks multiple satellites at a time while providing fast time-to-first-fix, precise navigation updates (five times per second for t he GPS 18 x- 5 Hz, and once per second for the GPS 18x USB, 18x PC, and 18x LVC), and low power consumption. This generation of GPS sensors includes the capability of FAA Wide Area Augmentation System (WAAS) differential GPS.

The GPS 18x design uses the latest technology and high-level circuit integration to ach ieve superior performance while minimizing space and power requirements. The hardware capability combined with software intelligence makes the GPS 18x easy to integrate and use.

The GPS 18x series products are designed to withstand rugg ed operating conditions and are waterproof to IEC 60529 IPX7, immersion in 1 meter of water for 30 minutes. These complete GPS receivers require minimal additional components to be supplied by an OEM or system integrator. A minimum system must provide the GPS with a source of power and a clear view of the GPS satellites. 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

• GPS receiver tracks and uses multiple satellites for fast, accurate positioning and velocity estimates.

• Differential DGPS capability using real-time WAAS corrections yielding positio n errors of less than 3

meters.

• Compact, rugged design ideal for applications with minimal space.

• Factory configuration meets the needs of most systems that expect NMEA 0183 data from a GPS receiver.

Configuration commands are available to customize the NMEA 0183 output (see

NMEA 0183 Sentences

)

section 4.1 Received

• (GPS 18x LVC and GPS 18x-5Hz only) Highly accurate measurem ent pulse output for precise timing

measurements: one-pulse-per-second (1 Hz) for the GPS 18x LVC or 5 Hz for GP S 18 x-5Hz. Pulse width is configurable in 20 millisecond increments from 20 ms to 980 ms with 1 μs accuracy.

• Configurable for binary format data output.

• FLASH-based program allows new software revisions through a Web site download.

• Non-volatile memory does not require battery backup.

• Onboard rechargeable backup battery can maintain the real-time clock for up to 10 days.

• Configurable parameters include expected position, current time and date, and preferred position fix type

(3D or automatic).

• Waterproof design allows continuous exposure to the pr evailing weather conditions at most locations.

190-00879-08 GPS 18x Technical Specifications Rev. B

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1.5 GPS 18x SERIES

There are several different versions of GPS 18x available. Refer below for a list of the three major divisions of the GPS 18x Series.

1.5.1 GPS 18x USB

The GPS 18x USB interfaces to a computer with an available USB port. Drivers are available for use on Windows computers. Macintosh and Linux drivers are not available from Garmin. After the drivers are loaded, the device appears to the Windows operating system as a USB-connected device and appears in Device Manager as a Garmin USB Device.

1.5.2 GPS 18x PC

The GPS 18x PC interfaces to a serial port of a computer via a DB-9 connector and receives power through a 12-volt cigarette lighter adapter. The unit accepts TIA-232-F (RS-232) level inputs and transmits voltage levels that swing from zero V (ground) to 5 V TIA-232-F (RS-232) polarity.

The GPS 18x PC can cause an issue with Windows operating systems if the DB9 connector is plugged into the computer before the navigation software is up and running. The Windows operating system may interpret the serial connector on the GPS 18x as a serial mouse. Please refer to

1.5.3 GPS 18x LVC, GPS 18x LVC-5m, and GPS 18x-5Hz

These products interface to a serial port. The units accept TIA-232-F (RS-232) level inputs and transmit voltage levels that swing from ground to the positive supply voltage, polarity protection. The cable contains wires for power, ground, receive, transmit, and measurement pulse output.

Appendix D: GPS 18x PC/LVC/18x-5Hz & Window Serial Mouse Issue for complete details.

TIA-232-F (RS-232) polarity. They also have reverse

At the end of the cable, the wires are terminated in a connector that is used by Garmin for testing purposes. Most customers will remove this connector and replace it with another connector of their own choosing. Removing the factory installed connector and/or replacing with another customer-supplied connector will have no affect on the warranty (see section 1.2 Limited Warranty with JST right-angle PCB-mount connector (model BM06B-SRSS-TBT) or side-entry PCB-mount connector (model SM06B-SRSS-TB). You may obtain technical information on these PCB-mount mating connectors from the JST Web site:

Note: Unless otherwise specified, all references to the GPS 18x LVC also include the GPS 18x LVC-5m.

www.jst.com.

). The factory-installed connector will mate

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1.6 TECHNICAL SPECIFICATIONS

Specifications are subject to change without notice.

1.6.1 Physical Characteristics

1.6.1.1 Size

61 mm (2.4 inches) in diameter and 19.5 mm (0.77 inches) in height

1.6.1.2 Weight

• GPS 18x USB: 3.7 oz (105 g)

• GPS 18x PC: 6.3 oz (180 g)

• GPS 18x LVC-5m (5 meter cable): 5.6 oz (160 g)

• GPS 18x-5Hz (5 meter cable): 5.8 oz (165 g)

1.6.1.3 Color

Black

1.6.1.4 Case Material

Polycarbonate thermoplastic that is waterproof to IEC 60529 IPX7 level (immersion in 1 meter of water for 30 minutes)

1.6.1.5 Cable Length

• GPS 18x USB: 2 meter

• GPS 18x PC: 2 meter

• GPS 18x LVC: 5 meter (Garmin Part Number 010-00321-36)

• GPS 18x-5Hz: 5 meter

1.6.2 Electrical Characteristics

1.6.2.1 Input Voltage

• GPS 18x USB: 4.4–5.5 Vdc

• GPS 18x PC: 8–30 Vdc (Automotive supply from cigarette lighter jack)

• GPS 18x LVC: 4.0–5.5 Vdc

• GPS 18x-5Hz: 4.0–5.5 Vdc

1.6.2.2 Input Current

• GPS 18x USB: 110 mA @ 5.0 Vdc

• GPS 18x PC: 65 mA @ 12 Vdc

• GPS 18x LVC: 90 mA @ 5.0 Vdc

• GPS 18x-5Hz: 100 mA @ 5.0 Vdc

1.6.2.3 CMOS Serial Output Levels

• GPS 18x PC: 0 Vdc to 5 Vdc (Asynchronous Serial, TIA-232-F (RS-232) Compatible Polarity)

• GPS 18x LVC and GPS 18x-5Hz: 0 Vdc to Vin, between 4 and 5.5 Vdc (Asynchronous Serial, TIA-232-F

(RS-232) Compatible Polarity)

1.6.2.4 GPS Receiver Sensitivity

-185 dBW minimum

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1.6.2.5 Environmental Characteristics

• Operating Temperature: -30°C to +80°C (-22°F to +176°F)

• Storage Temperature: -40°C to +90°C (-40°F to +194°F)

1.6.3 GPS Performance

1.6.3.1 Receiver

WAAS Enabled® GPS receiver continuously tracks and uses multiple satellites to compute and update your position.

1.6.3.2 Acquisition Times

• Reacquisition: Less than 2 seconds

• Hot: Approx. 1 second (all data known)

• Warm: Approx. 38 seconds (initial position, time, and almanac known; ephemeris unknown)

• Cold: Approx. 45 seconds

1.6.3.3 Update Rate

• GPS 18x USB, PC, and LVC: 1 record per second

• GPS 18x-5Hz: 5 records per second

1.6.3.4 Accuracy

• GPS Standard Positioning Service (SPS)

Position: < 15 meters, 95% typical Velocity: 0.1 knot RMS steady state

• WAAS

Position: < 3 meters, 95% typical Velocity: 0.1 knot RMS steady state

• Measurement Pulse Output Time: ±1 microsecond at rising edge of the pulse

• Dynamics: 999 knots velocity (only limited at altitude greater than 60,000 feet), 2g dynamics

1.6.4 Interfaces

1.6.4.1 GPS 18x Electrical Characteristics

• GPS 18x USB: USB 2.0 full-speed protocol compatible, as well as USB 1.1 full-speed protocol.

• GPS 18x PC and LVC:

baud.

• GPS 18x-5Hz:

1.6.4.2 Garmin Interface and Garmin USB Protocol

Refer to the Garmin Device Interface Specification found in the Garmin Device Interface SDK for information about the Garmin Interface and the Garmin USB Protocol. At the time of this printing, this document is located on the Garmin Web site at:

See

Appendix B: Garmin Binary Output Format for additional information concerning access to binary data from

the GPS 18x USB.

www.garmin.com/support/commProtocol.html.

TIA-232-F (RS-232) compatible asynchronous receiver. Default setting is 4800

TIA-232-F (RS-232) compatible asynchronous receiver. Default setting is 19200 baud.

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1.6.4.3 GPS 18x PC, GPS 18x LVC, & GPS 18x-5Hz Protocols

• NMEA 0183 Version 2.0 or NMEA 0183 Version 2.30 (Version 2.0 is factory default, progr a mmable b y

data field 7 of the PGRMC1 sentence described in

Information (PGRMC1)

section 4.1.4 Additional Sensor Configuration

• Available NMEA 0183 output sentences include GPALM, GPGGA, GPGSA, GPGSV, GPRM C, GP V TG,

GPGLL, PGRME, PGRMF, PGRMM, PGRMT, PGRMV, and PGRMB (Garmin proprietary sentences).

section 4.2 Transmitted NMEA 0183 Sentences for format descriptions.

See

• Configuration and initialization is accomplished with NMEA 0183 input sentences. Allows initializatio n of

information such as expected position, date, time, earth datum, and differential mode. See

Received NMEA 0183 Sentences

for format descriptions.

section 4.1

• Configurable for binary data output.

1.6.4.4 Measurement Pulse Output (GPS 18x LVC & GPS 18x-5Hz only)

• GPS 18x LVC: 1 Hz pulse with programmable width, configurable in 20 ms increments form 20 ms to 980

ms. See

section 4.1.3 Sensor Configuration Info rmation (PGRMC) for details about configuring the

Measurement Pulse Output (or PPS) feature.

• GPS 18x-5Hz: 5 Hz pulse synchronized with the time of fix. One of the five pulses will align with the UTC

second boundary. The pulse width is programmable from 20 ms to 180 ms. The PGRMC sentence will indicate which pulse is at the top-of-the-second. See

(PGRMC)

for details about configuring the Measurement Pulse Output (or PPS) feature.

section 4.1.3 Sensor Configuration Information

• 1 μs accuracy for all conditions in which the GPS 18x LVC or GPS 18x-5Hz has reported a valid and

accurate position fix for at least the previous 4 seconds.

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2 GPSX 18x LVC & GPS 18x -5Hz WIRING AND PINOUTS

The GPS 18x LVC/18x-5Hz interfaces to a serial port. The unit accepts TIA-232-F (RS-232) level inputs and transmits voltage levels from ground to the input voltage, TIA-232-F (RS-232) polarity.

The GPS 18x LVC/18x-5Hz wires are terminated with a six-wire connector that is used by Garmin for testing purposes. You can remove this connector witho ut voiding your warranty (see

section 1.2 Limited Warranty).

2.1 GPS 18x LVC & GPS 18x -5Hz PINOUT

GPS 18x Pin

1 Yellow Measurement Pulse Output 28 2 Red Vin 26 3 Black Ground 28 4 White Transmit Data 28 5 Black Ground 26 6 Green Receive Data 28

Color Signal Name Wire Gauge

Table 1: GPS 18x LVC & GPS 18x-5Hz Wire Pinout

2.2 GPS 18x LVC & GPS 18x -5Hz WIRING DIAGRAMS

Figure 1: Computer Serial Port Interconnection

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