EBYTE E108-D01 1 Multi Mode Satellite Positioning Terminal User Manual

: June 10, 2024
: ebyte

EBYTE E108-D01 1 Multi Mode Satellite Positioning Terminal

Overview

Introduction

E108-D01 is a positioning terminal that supports multiple positioning systems (GPS, BDS, GLONASS, Galileo, etc.), with fast response and accurate positioning.
It outputs positioning information through the Modbus RTU protocol, supporting the output of RMC-ASCII strings conforming to the NMEA0183 protocol. It also supports separate registers to store (longitude, longitude direction, latitude, latitude direction, etc.), The baud rate of the serial port can reach up to 115200bps, which can be easily modified through the Modbus RTU protocol, convenient and fast.

Features

Support single-system positioning of BDS/GPS/GLONASS/GALILEO/QZSS/SBAS satellite navigation system, and multi-system joint positioning in any combination;
Multiple serial port baud rates (1200-115200bps) can be configured;
Support standard Modbus RTU protocol to read positioning information;
Multiple output formats for positioning information;
The antenna positioning status is output through registers and indicator lights;
The serial port supports TVS and overcurrent protection;
Industrial grade design, support operating temperature up to -40 ~ 85 ℃;
Support wide voltage input DC 5-36V;
The positioning accuracy can reach 2.5 meters (CEP50);

Quick Start

Preparation

Take obtaining the REC positioning information output by the device as an example:

Hard wares preparation:

A computer;
E108-D1 positioning module;
Active GPS antenna (SMA, inner thread, inner needle);
One USB to RS-485 serial cable;

Software preparation:

Serial port debugging tool (User can download the “XCOM” serial port debugging tool from Ebyte’s official website www.cdebyte.com);

Operation demonstration

After preparing the above software and hardware, user can query the device positioning information and UTC time through the Modbus RTU command, correctly connect the device power supply and serial port, connect the antenna and move the antenna to an open space, as shown in the following figure:

Select the correct serial port number, adjust the baud rate parameter to 9600-8N1, and send the hexadecimal data.

“0x010300C800110438” to receive the device response data, as shown in the figure below.
If the response data cannot be received, please check whether the serial port is connected correctly, whether the parameter configuration is correct, whether to send hexadecimal data.
If all the configurations are correct, but no response received yet, pls press the button to restore the factory parameters and test again.

Data analysis table

No.	Original Value (HEX)	Description	Conversion Rules	After Conversion
1	0x00 00	Positioning
Effectiveness	0x00：invalid
0x01：valid	valid
2	0x07 e6	year	HEXàDEC	2022
3	0x00 04	month	HEXàDEC	4
4	0x00 16	day	HEXàDEC	22
5	0x00 01	hour	HEXàDEC	1
6	0x00 34	minute	HEXàDEC	34
7	0x00 31	second	HEXàDEC	31
8	0x00 45	Longitude direction	Low level is valid, HEXàASCII	E
9	0x42 cf de 84	longitude	32-bit floating point numbers, big endian-big
endian	103.93460083007812
10	0x00 4e	Latitude direction	Low level is valid, HEXàASCII	N
11	0x4e f6 2a a7	latitude	32-bit floating point numbers, big endian-big
endian	30.77082633972168
12	0x00 00 00 00	speed over ground	32-bit floating point
numbers, big endian-big endian	0
13	0x00 00 00 00	course over ground	32-bit floating point
numbers, big endian-big endian	0

【Notes】：The time is UTC time.

Technical indicators

General Specifications

No.	Item	Specifications
1	voltage	5V~36V DC
2	Serial port spec.	Standard RS-485 interface
3	Baud rate	4800-115200bps
4	Communication protocol	Modbus RTU
5	Position system supported	BDS/GPS/GLONASS/GALILEO/QZSS/SBAS
6	User configuration	Modify the register through Modbus RTU, restart to take

GPS performance

Category	Indicator item	Typical value	Unit
positioning time (Test Condition 1)	Cold start	27.5	S
Hot start	＜1	S
Recapture	＜1	S
A-GNSS	＜10	S
Sensitivity (Test Condition 2)	Cold start	-148	dBm
Hot start	-162	dBm
Recapture	-164	dBm
Track	-166	dBm
precision (Test Condition 3)	Horizontal positioning accuracy

2.5

|

m

High positioning accuracy| 3.5| m
Speed positioning accuracy| 0.1| m/s
Timing accuracy| 30| ns
Power consumption| Capture current| 30| mA
（Test Condition 4）| Tracking current| 20| mA
---|---|---|---
Working temperature| —| -35℃–85℃| —
Storage temperature| —| -55℃–100℃| —
Humidity| —| 5%–95%RH (non-condensing)| —

【Notes】：The above results are GPS/BDS dual-mode working mode
[Test Condition 1]: More than 6 of receiving satellites, the signal strength of all satellites is -130dBm, the average value is obtained after 10 tests, and the positioning error is less than 10 meters.
[Test Condition 2]：The noise figure of the external LNA is 0.8, the number of receiving satellites is greater than 6, and the received signal strength value under the condition of locking within five minutes or not losing the lock.
[Test Condition 3]：Open and unobstructed environment, 24 hours of continuous power-on test, 50% CEP.
[Test Condition 4]： The number of receiving satellites is greater than 6, and the signal strength of all satellites is -130dBm.

Mechanical dimension drawing

Pin and Indicator light Definitions

No.	Identification name	Function description
1	Factory button	Long press for 5-10s is valid, and the device address and

baud rate parameters are restored to the factory parameters; Factory parameters: the device address is 1, the serial port parameter is 9600/8/no parity/1
2| ANT| SMA antenna interface, need to use GPS active antenna

3

| RXD
Indicator light| Receive indicator, flashes when receiving data from RS485 bus

4

| TXD
Indicator light| Transmitting indicator, flashes when transmitting data to RS485 bus

5

| PPS Second pulse indicator| Steady on when the positioning is invalid; flashes once per second after the positioning is valid

6

| PWR Indicator light| Power indicator, steady on when power on
7| DC_IN| Power interface, 5~36V DC female socket (inner needle diameter 2.0mm, hole diameter 6.4mm)
8| Power interface| 3.81mm phoenix terminal power input positive (top), power input negative (bottom), 5~36V DC, cannot supply power with socket at the same time
9| RS-485 interface| RS485 bus B (top), RS485 bus A (bottom)

Modbus Register

Communication Protocol

The protocol layer of the GPS/BDS positioning module is a standard Modbus communication protocol, which conforms to the national standard GBT 19582.1-2008 “Industrial Automation Network Specification Based on Modbus Protocol”. It adopts the Modbus RTU communication protocol, and return data according to the parsing result by receiving and parsing the frame data on the data bus.
The frame format is as follows:

Register description

The following table describes the specific meaning of the decimal registers and the function codes used for operation.

Register	Read function code (HEX)	Write function code (HEX)	Channel example
[Area 1] Discrete Input Register	02	——	10001, indicating the DI1 register

address
[Area 0] Switch output register| 01| 05
0F| 00001, indicating the DO1 register address
[Area 3] Input register| 04| ——| 30001, means address 1 of zone 3
[Area 4] Holding Registers| 03| 06
10| 40001, indicating address 1 of area 4

【Note】This device will only use the register address of zone 4 (that is, the holding register).

Register table

Register Function	Register Address	Data Format	Data Range/Remarks
（Decimal）	（Hex）
Version number	40001	0001	Int16

bits represent the major version number, and the lower 4 bits represent the minor version number. 0x0010 represents version 1.0. The version number is read-only.
---|---|---|---|---
Device address| 40002| 0002| Int16| 1-255, default 1, support to read and modify broadcast address (0x00).
Baud rate| 40003| 0003| Int16| Baud rate code：
0x0000：1200bps， 0x0001：2400bps， 0x0002：4800bps， 0x0003：9600bps， 0x0004：19200bps，0x0005：38400bps， 0x0006：57600bps，0x0007：115200bps，
Parity| 40004| 0004| Int16| 0x0000：None parity， 0x0001：Odd parity， 0x0002：Even parity， Configuring other parameters does not take effect;
RMC-Location Data| 40005| 0005| String (70Btye)| Store 70 bytes of RMC- NMEA0183 protocol data, use ASCII encoding, and use AB in the decoding order;
…| …| …| …| Reserve;
Positioning status| 40200| 00C8| Int16| 0：invalid positioning，1：valid positioning, read only；
Year| 40201| 00C9| Int16| 2022 represents year 2022, read only;
Month| 40202| 00CA| Int16| The value range is 1 to 12, representing January to December respectively, read-only;
Day| 40203| 00CB| Int16| The value range is 1 to 31, representing 1st to 31st respectively, read-only;
Hour| 40204| 00CC| Int16| The value range is 0 to 23, representing 0 to 23 o’clock respectively, read-only;
Minute| 40205| 00CD| Int16| The value ranges from 0 to 59, representing 0 to 59 minutes respectively, read-only;
Second| 40206| 00CE| Int16| The value ranges from 0 to 59, representing 0 to 59 seconds respectively, read only;
Longitude direction| 40207| 00CF| Int16| 0x45(ASCII：E) represents the East longitude, 0x57(ASCII：W) represents the West longitude;
Longitude| 40208| 00D0| Float (4Byte)| The unit is degrees, 5 decimal places after the decimal point, read only Example: 103.93416°, word order: big endian, byte order: big endian;

Latitude direction

|

40210

|

00D2

|

Int16

| 0x4E(ASCII ： N) Represents North latitude, read only 0x53(ASCII：S) Represents South latitude
Latitude| 40211| 00D3| Float

(4Byte)

| The unit is degrees, 5 decimal places after the decimal point, read only Example: 30.77056°, word
| | | | order: big endian, byte order: big endian;
---|---|---|---|---
Speed over ground| 40213| 00D5| Float (4Byte)| The unit is Kn, read-only, word order: big endian, byte order: big endian;
Course over

ground

|

40215

|

00D7

| Float (4Byte)| The unit is Kn, read-only, word order: big endian, byte order: big endian;
[Note] Single-precision floating-point uses the standard IEEE754 format, with a total of 32 bits (4 bytes). The default single-precision floating point endian mode is ABCD (high byte first, low byte last), for example: 0x3FF1EB85 represents 1.89 (reserved 2 decimal places).

Use of Modbus RTU

[Note] In the following demo, the device address is 1. If using a different device address, then the address bits and checking code are different from below values.

Holding Registers

The register used by E108-D01 is holding register. The function code for writing the holding register is 0x06 (write a single holding register), and reading the holding register uses 0x03 (reading the holding register)

0x03 code read instruction format (take the read version as an example):

Device address	Function code	First address	Read quantity	Check code CRC
01	03	00 01	00 01	D5 CA

Return format (take the read version as an example):

Device address	Function code	Data length	Read quantity	Check code CRC
01	03	02	00 10	B9 88

0x06 code configuration command format (configure device address as an example):

Device address	Function code	Data length	Value	Check code CRC
01	03	00 02	00 01	25 CA

Return format (configured device address as an example): the same as the command format;

Read Holding Register Instruction

Read version number

Command frame: 01 03 00 01 00 01 D5 CA

Address	Function code	Register start address	Number of registers	CRC check
0x01	0x03	0x00 0x01	0x00 0x01	0xD5 0xCA

Response frame: 01 03 02 00 10 B9 88

Address	Function code	Data length	data	CRC check
0x01	0x03	0x02	0x00 0x10	0xB9 0x88

Note:
The version number in the returned data is 0x0010, indicating that the version number is V1.0.

Read device address (broadcast)

Command frame: 00 03 00 02 00 01 24 1B

Address	Function code	Register start address	Number of registers	CRC check
0x00	0x03	0x00 0x02	0x00 0x01	0x24 0x1B

Response frame: 00 03 02 00 01 44 44

Address	Function code	Data length	data	CRC check
0x00	0x03	0x02	0x00 0x01	0x44 0x44

[Note] This command is a general read command of the address. When using the broadcast command, to avoid conflicts with other devices in the system, please ensure that only the device to be read is connected to the bus when reading.

Read device baud rate

Command frame: 01 03 00 03 00 01 74 0A

Address	Function code	Register start address	Number of registers	CRC check
0x01	0x03	0x00 0x03	0x00 0x01	0x74 0x0A

Response frame: 01 03 02 00 03 F8 45

Address	Function code	Data length	data	CRC check
0x01	0x03	0x02	0x00 0x03	0xF8 0x45

Note:
The returned baud rate is 0x03, which means 9600 bps. For other baud rate codes, see the description of “Modbus register table”.

Read parity

Command frame: 01 03 00 04 00 01 C5 C8

Address	Function code	Register start address	Number of registers	CRC check
0x01	0x03	0x00 0x04	0x00 0x01	0xC5 0xC8

Response frame: 01 03 02 00 00 B8 44

Address	Function code	Data length	data	CRC check
0x01	0x03	0x02	0x00 0x00	0xB8 0x44

Note: The return check digit is 0x00, which means no parity check. See the description of “Modbus register table” for other check codes.

Read positioning data (RMC)

Command frame: 01 03 00 05 00 23 14 12

Address	Function code	Register start address	Number of registers	CRC check
0x01	0x03	0x00 0x05	0x00 0x23	0x14 0x12

Response frame:

Address	Function code	Data length	data	CRC check
0x01	0x03	0x46	70byte data	2byte check

Positioning data (RMC) parsing
The 70-byte data returned by reading the positioning data (RMC) conforms to the NMEA0183 protocol, and the
ASCII display is as follows:
$GNRMC,083429.00,A,3046.26769,N,10356.04948,E,000.00,089.80,190422*21

Field	Symbol	Meaning	Value Range	Example	Remarks
1	$
2	GNRMC				RMC protocol header, GNRMC means joint positioning

3

status

40.46260/60=0.67438 degree, so the value 3640.46260 should be 36.67438 degree

6| a| Latitude direction| N/S| | N-North latitude，

S-South latitude

7| ddmm.mmmmm| Longitude| ddmm.mmmmm| 3640.46260| Convert to degrees when calculating: 36 degrees + 40.46260 minutes. 40.46260/60=0.67438 degree, so the value
| | | | | 3640.46260 should be 36.67438 degree
---|---|---|---|---|---
8| a| Longitude

direction

13

|

| statement

terminator

| | |

14

|

24

|

checksum

| XOR the data between ‘$’ and ‘*’ (excluding these two characters) by byte, expressed as a hexadecimal value

Write Holding Register Instructions

Modify device address (broadcast)

[Note]This command is a general read command of the address. When using the broadcast command, to avoid conflicts with other devices in the system, please ensure that only the device to be read is connected to the bus when reading.

Command frame: 00 06 00 02 00 01 E8 1B

Address	Function code	Register start address	Number of registers	CRC check
0x00	0x06	0x00 0x02	0x00 0x01	0xE8 0x1B

Response frame: 00 06 00 02 00 01 E8 1B

Address	Function code	Register start address	Number of registers	CRC check
0x01	0x06	0x00 0x02	0x00 0x01	0xE8 0x1B

Note:
This command is used to set the device address, use 0x00 as the broadcast address, and modify the device address to 0x01.

Modify baud rate

Command frame: 01 06 00 03 00 03 39 CB

Address	Function code	Register start address	Number of registers	CRC check
0x01	0x06	0x00 0x03	0x00 0x03	0x39 0xCB

Response frame: 01 06 00 03 00 03 39 CB

Address	Function code	Register start address	Number of registers	CRC check
0x01	0x06	0x00 0x03	0x00 0x03	0x39 0xCB

Note:

This command is used to set the baud rate of the device to 9600.
The device defaults to 9600 baud rate without verification when it leaves the factory. Users can set the baud rate and verification method according to actual needs.

Modify the parity

Command frame: 01 06 00 06 00 04 09 CB

Address	Function code	Register start address	Number of registers	CRC check
0x01	0x06	0x00 0x06	0x00 0x04	0x09 0xCB

Response frame: 01 06 00 06 00 04 09 CB

Address	Function code	Register start address	Number of registers	CRC check
0x01	0x06	0x00 0x06	0x00 0x04	0x09 0xCB

Note:
This command is used to set the parity bit of the device to odd parity.
The final interpretation right belongs to Chengdu Ebyte Electronic Technology Co., Ltd.

Revise history

Version	Revise date	Revise instruction	Issued by
1.0	2022-05-05	Initial version	LC
1.1	2022-05-31	Content revision	XXN

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