Tallysman TW5310 User manual

TW5310

GPS Receiver/Antenna

User Manual

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Document # 61-0009-0

TW5310 User Manual

2

Document Amendment Record

Revision

Date

Comments

Rev 1_0

28 Feb 2011

Preliminary release for review ( based on TW5300

build)

Rev1_1

9 June 2011

Based on new TW5310 &TW5210 builds

Rev 1_2

12 July 2011

Based on product release

Rev 1_3

3 Aug 2011

Added single end termination to 1PPS

Copyright

This document and the subject matter herein are proprietary items to which

Tallysman Wireless Inc. retains an exclusive right to reproduction, manufacture and

sale. This document is submitted in confidence, for the use of the recipient alone, or

in conjunction with Tallysman Wireless Inc. and its licensees, and for no other

purpose whatsoever unless permission for further disclosure is expressly granted in

writing. Information in this document is subject to change without notice.

Tallysman Wireless Inc.

106 Schneider Road, Unit 3

Ottawa ON K2K 1Y2 Canada

Tel: 613 591 3131

Fax: 613 591 3121

TW5310 User Manual

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Table of Contents

1 Introduction ................................................................................................................ 4

2 TW5X10 Evaluation ..................................................................................................... 6

2.1 Open Source GPS Software Utility ....................................................................... 6

2.2 Configurator ......................................................................................................... 6

3 TW5310 Interface ...................................................................................................... 7

3.1 Test cable ............................................................................................................. 8

4 TW5310 Connections .................................................................................................. 9

4.1 Power ................................................................................................................... 9

4.2 NMEA output ........................................................................................................ 9

4.3 1PPS .................................................................................................................... 10

4.3.1 1PPS Single ended termination ................................................................... 11

4.4 Cable Delays: ...................................................................................................... 11

4.5 1PPS Qualification .............................................................................................. 12

4.6 Baud Rate ........................................................................................................... 12

4.7 Satellite Based Augmentation System (SBAS) .................................................... 13

5 TW5310 Installation .................................................................................................. 13

6 NMEA Message Reference ........................................................................................ 15

6.1 NMEA Field Types ............................................................................................... 15

6.1.1 RMC ............................................................................................................. 16

6.1.2 GGA ............................................................................................................. 17

6.1.3 GSA .............................................................................................................. 18

6.1.4 GSV .............................................................................................................. 18

6.1.5 VTG .............................................................................................................. 19

7 TW5XXX Configurator ............................................................................................... 20

7.1 Parameter Fields ................................................................................................ 21

7.2 Read/Write ......................................................................................................... 23

TW5310 User Manual

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1 Introduction

The TW5310 is an integrated GPS receiver/antennas designed for use in professional

grade applications such as vehicle tracking and timing applications.

It features the STMicroelectronics STA8058 Teseo™ WAAS, EGNOS and MSAS enabled

GPS receiver IC, a high performance low noise amplifier stage, a tight out-of-band SAW

filter to reject interference, and a perfectly tuned antenna element for maximum GPS

signal reception, even in dense urban-canyon environments where multipath

interference is prevalent.

Available with brick-wall filter option to eliminate possible interference from

Lightsquared transmissions.

Figure 1 TW5310

The TW5310 is a through-hole mount GPS receiver/antenna housed in an industrial

grade weatherproof IP67 enclosure. It provides NMEA 0183 standard output at

RS232 levels.

Differential 1 pulse-per-second (1PPS) outputs are provided at RS422 levels. The

1PPS is synchronized to UTC.

A GPS position fix is obtained in less than 39 seconds from a cold start, and recovery

from temporary blockage of GPS signal is typically less than 1 second.

The last known position is periodically written to non-volatile memory to maintain

position information across power cycles.

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The TW5330 variant is the perfect solution for precision timing and network

synchronization.

Figure 2 TW5330

Features

 Standalone Integrated GPS Receiver/Antenna.

 16 channel simultaneous operation

 High performance tracking (-159dBm)

 Fast time to first fix

 SBAS Capable

 Low noise LNA and SAW band-pass filter

 GPS output: NMEA 0183 output

 Differential 1PPS output

 1PPS Qualification

 Configuration information saved across power cycles

 Waterproof enclosure (IP67)

 TW5310 Configuration application

 RoHS compliant

 Optional Brickwall pre-filter

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2 TW5X10 Evaluation

The TW5310 performance is easy to evaluate with the following software applications.

2.1 Open Source GPS Software Utility

The TW5310 is compatible with most third party applications that are capable of

decoding standard NMEA 0183 messages.

The following open source GPS utility can be used to display the NMEA output

sentences graphically.

http://www.visualgps.net/VisualGPS/

2.2 Configurator

Tallysman provides a Windows based Configurator application (Part # 42-0004-0) to

configure the operating parameters of the TW5XXX. See section 7 for configuration

parameter details

TW5310 User Manual

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3 TW5310 Interface

The TW5310 cable is terminated in a RJ45 connector. The RJ45 connector can be cut off

if a custom connector interfaces is required.

Figure 3

Wiring connections are indicated in Table 1

Wire Color

Signal

Comments

RJ45 pin #

Brown

Power

12V

8

Brown/White

Gnd

0V

7

Blue/White

RX into the TW5310

RS232 level (+/-6V)

5

Orange

TX out of the TW5310

RS232 level (+/-6V)

6

Orange/White

Differential 1PPS output

1PPS_B

(0 to 3.3V levels).

3

Blue

Differential 1PPS output

1PPS_A

(0 to 3.3V levels).

4

White/Green

1PPS_A

N/A

1

Green

1PPS Qualification

(0 to 3.3V levels)

2

Table 1

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3.1 Test cable

Figure 4 shows the pin outs for an optional test cable (Part # 27-00045-0) terminated in

a DB9.

8P8C

Power (Red)

Gnd (Black)

Power

GND

DB9F

Shell

RX (into PC)

(2)

TX (out of PC)

(3)

TW53XX

Debug cable (27-0045-0) Rev 1_0

RX

TX

1PPS Valid ( GPIO_A)

1 ft

Flying Leads

22AWG

GPIO_B

(5)GND

1

8

2

3

4

5

6

1PPS_A

1PPS_B

Pinouts shown for a

CROSS OVER

Connector

1PPS_A

1PPS_B

1PPS Valid (GPIO_A)

GPIO_B

7

Figure 5

Note: The RJ45 pin connections on the test cable assume a “CROSS over” Block to

connect to the TW5310.

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4 TW5310 Connections

The TW5310 supports the following connections:

4.1 Power

The TW5310 operates at 12 volts. Overvoltage and transient protection make it suitable

for installation in the harshest of vehicle installations.

 Connect the BROWN wire to Positive supply (12V or 5V depending on variant)

 Connect the BROWN/WHITE wire to 0V

Note: Tallysman offers variants of the TW5310 which operate with 3.3v, 5V and Vbus (

USB version power.

4.2 NMEA output

See section 3 for wiring details

GPS position and timing information is output once per second in NMEA format. The

NMEA RX and TX outputs are at RS232 levels.

The default output from the TW5310 is 3 digit GGA and RMC messages at 4800 baud,

but can be configured to output 4 or 5 digit resolution.

The TW5310 can be configured to output the following NMEA sentences using the

Tallysman TW5XXX Configurator:

 RMC - The RMC message is the recommended minimum data for GPS

 GGA - The GGA message provides GPS Fix Information

 VTG - The VTG message provides vector track and speed over ground

 GSA - The GSA message provides overall satellite data

 GSV - The GSV message provides detailed satellite data.

Note 1: When configuring additional output messages the baud rate must be increased

to ensure that there is enough time to output all messages sentences e.g. set to 57,600

baud

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Note 2: If you are using the Visual GPS software utility to display TW5310 outputs, the

GSV message should be enabled to view satellite signal strengths.

4.3 1PPS

Differential 1PSS outputs at RS422 levels are provided. The 1PPS signal is synchronized

to UTC to within 100 nanoseconds. The rising edge of the 1PPS signal is synchronized to

the start of UTC time.

See section 3 for wiring details

250 ms 750ms

1PPS_A

1PPS_B

0V

3V

0V

3V

Figure 6

The default pulse width is 250 ms, but is configurable from 100 ms to 500 ms.

After having obtained a GPS fix, the 1PPS output will be accurately maintained even

when tracking only one satellite. Once synchronized the 1PPS maintains synchronization

accuracy with no GPS reception by fly-wheeling for a period, see “1PPS Finish delay” in

section 4.5.

Signal levels are differential, 0.V to 3.3V.

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4.3.1 1PPS Single ended termination

If you are using a single ended termination of the 1PPS signal, either of the following

terminations can be used. 1PPS_A or 1PPS_B can be used as the single ended output.

1K Ohm

1PPS_A

1PPS-B

Gnd

1PPS_A

1PPS-B

500 Ohms

Figure 7

4.4 Cable Delays:

The timing of the 1PPS pulse depends on the length of both antenna and interface

cables. The 1PPS signal can be adjusted to provide a synchronized UTC second at the

users end-point.

Cable delays of 1 to 200ns can be configured.

To account for cable delays add 3ns for each meter of cable.

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4.5 1PPS Qualification

A 1PPS qualification signal is provided to indicates when the 1PPS output is valid,

qualification is based on a GPS fix with DOP <15.

See section 3 for wiring details

Figure 8 shows the internal 1PPS qualification status of the TW5310. Once the 1PPS

status is detected as good, a 1PPS Start Delay is inserted before the 1PPS qualification

signal is output to ensure that the TW5310 has time to average out the satellite clocks

and provide a stable 1PPS output.

On loss of 1PPS qualification status the 1PPS qualification output is maintained for the

1PPS Stop delay. During the 1PPS Stop delay time the TW5310 flywheels to maintain

timing.

0V

3.3V 1PPS Qualification output

1 PPS Qualification status

1PPS

Qual Start delay 1PPS

Qual stop delay

Figure 8

The signal levels 0V to 3.3V.

The default 1PPS Qual Start and Stop delays are set to 10 seconds.

4.6 Baud Rate

The TW5310 baud rate is configurable from 4800 bps to 115kbps

The default baud rate is 4800 baud

Note1: After changing the baud rate ensure that the baud rate of the connected

application matches that set otherwise you will be unable to communicate with the

TW5310.

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4.7 Satellite Based Augmentation System (SBAS)

The TW5310 can be configured to use satellite corrections transmitted by SBAS satellites

to provide greater positioning accuracy.

There are three compatible SBAS systems which are integrated to provide a seamless

worldwide navigation system. The following are valid SBAS satellite ID’s

Configure the SBAS satellite ID closest to your Location see Table 2 below

Satellite Name

NMEA

Satellite ID

(PRN)

Location

Inmartsat 4F3

46

133

98⁰ W

Galaxy 15

48

135

133⁰ W

Anik F1R

51

138

107.3⁰ W

Inmarsat

33

120

15.5⁰ W

ARTEMIS

37

124

21.5⁰ E (Test)

Inmarsat 4-F2

39

126

25⁰ E

Inmarsat 3-F1

44

131

64.5⁰ E

MTSAT-1R

42

129

140⁰ E

MTSAT-2

50

137

145⁰ E

Table 2

The default satellite ID is 133 (Suitable for longitudes of those of the Eastern US).

For more information on SBAS satellite see:

http://en.wikipedia.org/wiki/WAAS

http://en.wikipedia.org/wiki/European_Geostationary_Navigation_Overlay_Service

5 TW5310 Installation

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For best results the TW5310 GPS Receiver/Antenna should installed with a clear view of

the sky. The GPS Receiver/Antenna will obtain a 3D fix GPS fix with a minimum of 4

satellites.

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6 NMEA Message Reference

NMEA 0183 sentences are all ASCII. Each sentence begins with a dollar sign ($) and ends

with a carriage return linefeed (<CR><LF>). Data is comma delimited. A checksum is

optionally added.

The following format indicate 5 digit RMC and GGA outputs.

6.1 NMEA Field Types

NMEA message fields have the following format:

Status: A Yes/Data valid

V No/Data invalid

‡ Latitude: llll.lllll ddmm.mmmmm

‡ Longitude: yyyyy.yyyyyy dddmm.mmmmm

Time: hhmmmsslss HoursMinutesSeconds.decimalSeconds

Defined Fields: Predefined Constants, most often alpha characters

Numeric Numbers: x.x Digit.decimalDigit

Fixed Hex Fields hh__ MSB to the left

Information fields:

c---c Variable length Character fields

aa__Fixed Length alpha fields

xx__Fixed Length numeric characters

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cc__fix length of valid characters

Spaces are only used in variable text fields.

Negative values are indicated by the first character in the field.

Please see the full NMEA 0183 Specification for a full description of the message field

formats.

‡ Note: The number of decimal digits output on RMC and GGA is configurable i.e. 3,4 or

5

6.1.1 RMC

The RMC message is the recommended minimum data for GPS

$GPRMC,hhmmss.ss,a,llll.lllll,a,yyyyy.yyyyy,a,x.x,x.x,ddmmyy,x.x,a*hh

RMC= Recommended Minimum Specific GPS/TRANSIT Data

$GPRMC,204804.000,V,4520.254,N,07554.206,W,0.0,0.0,200608,0.0,W*7E

The following fields are listed in the order shown in the comma-separated sentence.

1 = UTC of position fix

2 = Data status (A= Data valid, V=navigation receiver warning)

3 = Latitude of fix

4 = N or S

5 = Longitude of fix

6 = E or W

7 = Speed over ground in knots

8 = Track made good in degrees true

9 = UT date

10 = Magnetic variation degrees (Easterly var. subtracts from true course)

11 = E or W

12 = Checksum

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Note: The number of

6.1.2 GGA

The GGA message provides Fix Information.

$GPGGA,hhmmss.sss,llll.lllll,a,yyyyy.yyyyy,a,x,xx,xx.x,xxx.xx,M,xx.x,M,x.x,xxxx*hh

GGA = Global Positioning System Fix Data

$GPGGA,204804.000,4520.25363,N,07554.20602,W,0,00,99.0,087.54,M,-34.4,M,,*62

The following fields are listed in the order shown in the comma-separated sentence.

1 = UTC of Position

2 = Latitude

3 = N or S

4 = Longitude

5 = E or W

6 = GPS quality indicator (0=invalid; 1=GPS fix; 2=Diff. GPS fix)

7 = Number of satellites in use [not those in view]

8 = Horizontal dilution of position

9 = Antenna altitude above/below mean sea level (geoid)

‡ 10 = Meters (Antenna height unit)

11 = Checksum

11 = Geoidal separation (Diff. Between WGS-84 earth ellipsoid and

mean sea level.-=geoid is below WGS-84 ellipsoid)

12 = Meters (Units of geoidal separation)

13 = Age in seconds since last update from diff. Reference station

14 = Diff. Reference station ID#

15 = Checksum

‡ Note: If 4 or 5 digit GGA is configured the Meters output will be 2 digits. If 3 digit GGA

is configured the Meters output will be 1 digit.

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6.1.3 GSA

The GSA message provides overall satellite data

$GPGSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx.x,xx.x,xx.x*hh

GSA = GPS receiver operating mode, SVs used for navigation, and DOP values.

$GPGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0*00

The following fields are listed in the order shown in the comma-separated sentence.

1 = Mode:

M=Manual, forced to operate in 2D or 3D

A=Automatic, 3D/2D

2 = Mode:

1=Fix not available

2=2D

3=3D

3-14 = Ids of SVs used in position fix (null for unused fields)

15 = PDOP

16 = HDOP

17 = VDOP

18 = Checksum

6.1.4 GSV

The GSV message provides detailed satellite data.

$GPGSV,x,x,xx,xx,xx,xxx,xx,…………….xx,xx,xxx,xx*hh

GS = Number of SVs in view, PRN numbers, elevation, azimuth & SNR values.

$GPGSV,3,1,11,03,12,174,,06,20,159,,13,14,315,,14,02,139,*7C

1 = Total number of messages of this type in this cycle

2 = Message number

3 = Total number of SVs in view

4 = SV PRN number

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5 = Elevation in degrees, 90 maximum

6 = Azimuth, degrees from true north, 000 to 359

7 = SNR, 00-99 dB (null when not tracking)

8-11 = Information about second SV, same as field 4-7

12-15 = Information about third SV, same as field 4-7

16-19 = Information about fourth SV, same as field 4-7

20 = Checksum

6.1.5 VTG

The VTG message provides vector track and speed over ground

$GPVTG,hhh.hh,a,hhh.hh,a,x.xx,a,xx.x,a*hh

VT = Course over Ground and Ground Speed.

$GPVTG,0.0,T,,M,0.0,N,0.0,K*60

1 = Measured heading

2 = reference (True)

3 = Measure heading

4 = reference (Magnetic)

5 = Horizontal speed (knots)

6 = Units ( knots)

7 = Horizontal speed ( km/hour)

8 = Units (km/hr)

9 = Checksum

16-19 = Information about fourth SV, same as field 4-7

20 = Checksum

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7 TW5XXX Configurator

Tallysman provides a Windows based Configurator application (Part # 42-000409) for

configuration of the TW5300 operating parameters.

Figure 9

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