Neoway G2 Montageanleitung

G2 & G7A

Commands Manual

Issue 1.0

Date 2019-04-08

Neoway Product Document

G2 & G7A

Commands Manual

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consent of Neoway Technology Co., Ltd.

is the trademark of Neoway Technology Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective

holders.

Notice

This document provides guide for users to use G2 & G7A.

This document is intended for system engineers (SEs), development engineers, and test engineers.

THIS GUIDE PROVIDES INSTRUCTIONS FOR CUSTOMERS TO DESIGN THEIR APPLICATIONS.

PLEASE FOLLOW THE RULES AND PARAMETERS IN THIS GUIDE TO DESIGN AND COMMISSION.

NEOWAY WILL NOT TAKE ANY RESPONSIBILITY OF BODILY HURT OR ASSET LOSS CAUSED BY

IMPROPER OPERATIONS.

THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE DUE TO

PRODUCT VERSION UPDATE OR OTHER REASONS.

EVERY EFFORT HAS BEEN MADE IN PREPARATION OF THIS DOCUMENT TO ENSURE ACCURACY

OF THE CONTENTS, BUT ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS

DOCUMENT DO NOT CONSTITUTE A WARRANTY OF ANY KIND, EXPRESS OR IMPLIED.

Neoway provides customers complete technical support. If you have any question, please contact your

account manager or email to the following email addresses:

[email protected]

Website: http://www.neoway.com

G2 & G7A

Commands Manual

Contents

Overview

................................................................................................... 1

Data Format Protocol

............................................................................... 2

NMEA Identifiers and Field Type

............................................................. 3

3.1 Talker Identifier ............................................................................................................................. 3

3.2 Satellite ID.................................................................................................................................... 3

3.3 System Identifier .......................................................................................................................... 3

3.4 Field Type..................................................................................................................................... 4

Sentence Identifiers

................................................................................. 6

Input Messages (Custom NMEA Sentences)

......................................... 7

5.1 CAS-Start GAGAN ....................................................................................................................... 7

5.2

CAS00-Save Configurations

...................................................................................................... 7

5.3

CAS01-

Set UART Baud Rate...................................................................................................... 8

5.4

CAS02-

Set Update Frequency of Position Fix ............................................................................ 9

5.5

CAS03-Enable or Disable Message Output

............................................................................. 9

5.6

CAS04-Set Talker Identifier

...................................................................................................... 10

5.7

CAS05-

Set NMEA Protocol Type ...............................................................................................11

5.8

CAS10-Set Start Mode

............................................................................................................. 12

Output Messages (Standard NMEA Sentences)

.................................. 14

6.1 GGA-Fix Data............................................................................................................................. 14

6.2 GLL-Geographic Position-Latitude/Longitude............................................................................ 15

6.3 GSA-GNSS DOP and Active Satellites ...................................................................................... 16

6.4 GSV-GNSS Satellite in View...................................................................................................... 18

6.5 RMC-Recommended Minimum Navigation Information............................................................. 19

6.6

VTG-

Course Over Ground and Ground Speed ......................................................................... 20

6.7 GST-GNSS Pseudorange Error Statistics.................................................................................. 22

6.8

ZDA-

Time & Date....................................................................................................................... 23

6.9 ANT-Antenna Status................................................................................................................... 23

6.10

DHV-Design Hourly Volume

................................................................................................ 24

G2 & G7A

Commands Manual

iii

About This Document

Scope

This document is applicable to G2 & G7A series.

Audience

This document is intended for system engineers (SEs), development engineers, and test engineers.

Change History

Issue

Date

Change

Changed By

1.0

2019-01

Initial draft

Zhuo

Conventions

Symbol

Indication

This warning symbol means danger. You are in a situation that could cause fatal

device damage or even bodily damage.

Means reader be careful. In this situation, you might perform an action that

could result in module or product damages.

Means note or tips for readers to use the module

G2 & G7A

Commands Manual

Overview

G2 and G7A Global Navigation Satellite System (GNSS) receivers are compatible with the NMEA 0183

standard. They support NMEA 0183 version 4.1 by default and are compatible with version 2.3 and

3.X. NMEA 0183 V4.0 and versions earlier than V2.3 are supported by sending commands.

Data is transmitted in serial asynchronous form. The first bit is a start bit, followed by data bits. Least

significant bit first is shown in Figure 1-1.

Figure 1-1 Data transmission mode

Start bit

Data bit

Stop bit

The following parameters are used:

Table 1-1 Parameters used in data transmission

Baud rate (bps)

4800, 9600, 19200, 38400, 57600, 115200

Data bit

8 bit

Stop bit

1 bit

Checksum

None

G2 & G7A

Commands Manual

Data Format Protocol

NMEA messages are transmitted by GNSS receivers and comply with the NMEA0183 protocol.

Table 2-1 Data format

{

data

}

*<checksum>

Start sign

Address field

Data fields

Checksum field

Sequential

message

identifier field

Each

sentence

starts with a

"$" sign.

Two parts: Talker

identifier and

sentence format

Start with a

",", followed

by data of

fixed length

and variable

length

The 8-bit exclusive OR (no

start or stop bits) of all

characters in the sentence,

including "," and "^"

delimiters, between but not

including the "$" and the "*"

delimiters.

The hexadecimal value of

the most significant and least

significant 4 bits of the result

is converted to two ASCII

characters (0-9, A-F (upper

case)) for transmission.

Each sentence

ends with the

termination

delimiter

For detailed NMEA protocol, visit http://www.nmea.org/.

This Commands Manual adds custom sentences based on NMEA data format protocol

to control the

work mode and query the product information of the GNSS receivers. The identifier of custom

sentences is 'P'.

G2 & G7A

Commands Manual

NMEA Identifiers and Field Type

3.1 Talker Identifier

Talker Identifier sent in NMEA sentence serves to define the GNSS mode. The following table lists

Talker Identifier supported.

Talker

Identifier

BeiDou Navigation Satellite System (BDS)

Global Positioning System (GPS, SBAS, QZSS)

Global Navigation Satellite System (GLONSS)

Global Navigation Satellite System (GNSS)

Custom information

3.2 Satellite ID

Satellite System

Satellite ID Number

in NMEA

PRN Number of

Satellite

Relationship between Satellite

ID Number and PRN Number

GPS

1~32

0+PRN

SBAS

33~51

120~138

87+PRN

GLONASS

65~88

1~24

64+PRN

BDS

1~37

0+PRN

QZSS

33~37

193~197

PRN-160

3.3 System Identifier

G2 and G7A receivers support multiple versions of the NMEA data format protocol. Different versions

G2 & G7A

Commands Manual

vary with the system identifier.

NMEA4.0 and Earlier Versions

NMEA4.1

GGA

[1]Identifier

ZDA

[1]Identifier

GLL

[1]Identifier

RMC

[1]Identifier

VTG

[1]Identifier

GSA

[2]Identifier

[1] Identifier, additional fields are used to identify

different GNSS constellations.

GSV

[2]Identifier

[1]Identifier: If satellites of only one GNSS constellation are used to calculate locations, the

transmission identifier is BD,

GP, GL, or GA. If satellites of multiple GNSS

constellations

are used

to fix the position, the transmission identifier is GN.

[2]Identifier: GP (GPS), BD (BDS ), GL (GLONASS)

G2 and G7A receivers support three versions of the NMEA0183 protocol.

NMEA 2.2 is different from 2.3/4.0 in the following items:

Mode is not output in GLL, RMC, and VTG sentences.

In GGA sentence, the quality indicator (FS) is displayed as 1 for both estimated mode and SPS

mode. In NMEA 2.3/4.0, this field is displayed as 6 for estimated mode.

NMEA 4.1 added some fields compared to NMEA 4.0:

systemId in GSA sentence

signalId in GSV sentence

navStatus in RMC sentence

For details, see 5

Input Messages (Custom NMEA Sentences)

3.4 Field Type

Field Type

Symbol

Definition

Special Format Fields

G2 & G7A

Commands Manual

Status

Single character field

A=Yes, Data Valid, Warning Flag Clear

V=No, Data Invalid, Warning Flag Set

Latitude

ddmm.mmmm

Fixed/variable length field

Degrees minutes. Decimal - 2 fixed digits of degrees, 2 fixed

digits of minutes and a variable number of digits for decimal-

fraction of minutes.

Longitude

dddmm.mmmm

Fixed/variable length field

Degrees minutes. Decimal - 3 fixed digits of degrees, 2 fixed

digits of minutes and a variable number of digits for decimal-

fraction of minutes.

Date

hhmmss.sss

Fixed length field

Hours minutes seconds. Decimal - 2 fixed digits of hours, 2

fixed digits of minutes, 2 fixed digits of seconds and 3 fixed

digits for decimal-fraction of seconds.

Defined field

Some fields are specified to contain pre-defined constants.

Numeric Value Fields

Variable numbers

x.x

Variable length integer or floating numeric field

Fixed HEX field

Fixed length HEX numbers only, MSB on the left

Variable HEX field

h—h

Variable length HEX numbers only, MSB on the left

Information Fields

Fixed alpha field

Fixed length field of upper-case or lower-case alpha

characters

Fixed number field

Fixed length field of numeric characters

Variable text field

c—c

Variable length field of valid characters

G2 & G7A

Commands Manual

Sentence Identifiers

Sentence Formatter

Class/ID

Description

Standard NMEA Sentence

Standard Sentence

GGA

0x4E 0x00

Global Positioning System Fix Data

GLL

0x4E 0x01

Geographic Position—Latitude/Longitude

GSA

0X4E 0x02

GNSS DOP and Active Satellites

GSV

0x4E 0x03

GNSS Satellites in View

RMC

0x4E 0x04

Recommended Minimum Specific GNSS Data

VTG

0x4E 0x05

Course Over Ground and Ground Speed

GST

0x4E 0x07

GNSS Pseudorange Error Statistics

ZDA

0x4E 0x08

Time & Date

ANT

0x4E 0x11

Antenna Status

DHV

0x4E 0x13

Design Hourly Volume

Custom NMEA Sentence

Custom Sentence

CAS00

Save Configurations

CAS01

Communication Protocol and Serial Interface

Configurations

CAS02

Set Update Frequency of Position Fix

CAS03

Enable or Disable Message Output and Frequency

CAS04

Set Quantity of Initial Systems and Channels

CAS05

Set Talker Identifier of NMEA Sentences

CAS10

Set Start Mode

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