Quectel EC200 Series Montage- und Bedienungsanleitung

EC200x&EC600S&EG912Y Series

PPP Application Note

LTE Standard Module Series

Ver. EC200x&EC600S&EG912Y_Series_PPP_Application_Note_V1.0

Date: 2020-07-31

Status: Released

www.quectel.com

LTE Standard Module Series

EC200x&EC600S&EG912Y Series PPP Application Note

EC200x&EC600S&EG912Y_Series_PPP_Application_Note 1 / 27

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LTE Standard Module Series

EC200x&EC600S&EG912Y Series PPP Application Note

EC200x&EC600S&EG912Y_Series_PPP_Application_Note 2 / 27

About the Document

Revision History

Version

Date

Author

Description

1.0

2020-07-31

Chaim QIAN

Initial

 LTE Standard Module Series 
 EC200x&EC600S&EG912Y Series PPP Application Note 
EC200x&EC600S&EG912Y_Series_PPP_Application_Note 3 / 27 
 
 
 
Contents 
About the Document...................................................................................................................................2 
Contents.......................................................................................................................................................3 
Table Index...................................................................................................................................................5 
Figure Index.................................................................................................................................................5 
1Introduction ..........................................................................................................................................6 
2PPP Application Mode.........................................................................................................................7 
3PPP Setting...........................................................................................................................................8 
3.1. General Procedures for PPP Setting...........................................................................................8 
3.2. Recommended Procedures for PPP Setting...............................................................................9 
4PPP Connection Modes.....................................................................................................................11 
4.1. Data Mode and Command Mode...............................................................................................11 
4.1.1. Switch from Data Mode to Command Mode..................................................................11 
4.1.1.1. Change DTR Level to Switch from Data Mode to Command Mode......................11 
4.1.1.2. Use Sequence +++ to Switch from Data Mode to Command Mode......................11 
4.1.2. Switch from Command Mode to Data Mode..................................................................12 
4.1.2.1. UseATO to Switch from Command Mode to Data Mode.......................................12 
4.2. Handle URC in Data Mode ........................................................................................................12 
4.3. Data Carrier Detection (DCD) Mode..........................................................................................12 
5PPP Connection Termination ...........................................................................................................14 
6PPP Dial-up Operations.....................................................................................................................15 
6.1. Preparation.................................................................................................................................15 
6.2. PPP Dial-up in Windows 10.......................................................................................................15 
6.2.1. Modem Configuration.....................................................................................................15 
6.2.1.1. Add a New Modem.................................................................................................15 
6.2.1.2. Configure the Modem Driver ..................................................................................20 
6.2.2. Dial-up Network Configuration.......................................................................................21 
6.2.2.1. Create a New Connection ......................................................................................21 
6.2.2.2. Configure the Connection.......................................................................................23 
6.2.2.3. Configure the Dial-up Tool......................................................................................24 
6.2.2.4. Establish the Dial-up Connection ...........................................................................25 
7Appendix A References.....................................................................................................................26 

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Table Index

Table 1: Related Document........................................................................................................................ 26

Table 2: Terms and Abbreviations.............................................................................................................. 26

 LTE Standard Module Series 
 EC200x&EC600S&EG912Y Series PPP Application Note 
EC200x&EC600S&EG912Y_Series_PPP_Application_Note 5 / 27 
 
 
 
Figure Index 
Figure 1: PPP Application Mode ..................................................................................................................7 
Figure 2: General Procedures for PPP Setting............................................................................................ 8 
Figure 3: Flowchart of Recommended Procedures for PPP Setting........................................................... 9 
Figure 4: Search for “Phone and Modem”in Control Panel ......................................................................16 
Figure 5: Add a New Modem......................................................................................................................17 
Figure 6: Select Model of the Modem........................................................................................................18 
Figure 7: Select a Port ...............................................................................................................................19 
Figure 8: New Modem is Installed Successfully ........................................................................................19 
Figure 9: Configure the Modem Driver.......................................................................................................20 
Figure 10: Create a New Connection......................................................................................................... 21 
Figure 11: Set up the New Connection......................................................................................................22 
Figure 12: Configure the Connection......................................................................................................... 23 
Figure 13: Configure the Dial-up Tool........................................................................................................ 24 
Figure 14: Connecting to Dial-up Connection............................................................................................25 
Figure 15: Establish the Dial-up Connection Successfully........................................................................25 

LTE Standard Module Series

EC200x&EC600S&EG912Y Series PPP Application Note

EC200x&EC600S&EG912Y_Series_PPP_Application_Note 6 / 27

1Introduction

This document briefly introduces the PPP functions of Quectel’s LTE Standard

EC200x&EC600S&EG912Y series modules, including PPP application modes, setting procedures,

connection modes, termination steps, and dialing examples.

This document is applicable to following Quectel modules.

EC200T series

EC200S series

EC600S-CN

EG912Y series

LTE Standard Module Series

EC200x&EC600S&EG912Y Series PPP Application Note

EC200x&EC600S&EG912Y_Series_PPP_Application_Note 7 / 27

2PPP Application Mode

The usage of PPP (Point-to-Point Protocol) is illustrated in the following figure. Use UART port or USB

port for PPP connection. The module provides a PPP server for application, and the application provides

a PPP client for the module. Meanwhile, the application must provide protocols such as TCP/IP, HTTP(S),

etc. When PPP connection is established, the IP packet data stream from the application will be

transmitted to the Internet through the module.

Most standard operating systems (e.g. Windows, Unix/Linux) include the PPP protocol stack. For

operating systems that have no available applications for PPP connection, it is necessary to develop

applicable application software first.

UART

USB

UART

USB

PPP

Application

PPP

Radio Bearer

IP RELAY

Module

Application

TXD

RXD

CTS

RTS

DTR

DCD

RING

TXD

RXD

CTS

RTS

DTR

DCD

RING

USB_DM

USB_DP

USB_GN

USB_VBUS

USB_DM

USB_DP

USB_GND

USB_VBUS

Figure 1: PPP Application Mode

LTE Standard Module Series

EC200x&EC600S&EG912Y Series PPP Application Note

EC200x&EC600S&EG912Y_Series_PPP_Application_Note 8 / 27

3PPP Setting

3.1. General Procedures for PPP Setting

After the module registers on GPRS network, it is necessary to set the APN for PPP by AT+CGDCONT

and to start PPP by ATD*99#. After executing ATD*99#, the module will enter the PPP frame interaction

process, which is based on standard PPP protocol. The module data packet interaction description is

shown in the figure below. For more details about standard PPP, see RFC 1661.

AT+CGREG?

+CGREG:0,1

AT+CGDCONT=1,"IP","CMNET"

ATD*99#

7E FF 7D 23 C0 21 7D 21 7D ……

TE MT

CONNECT

Figure 2: General Procedures for PPP Setting

LTE Standard Module Series

EC200x&EC600S&EG912Y Series PPP Application Note

EC200x&EC600S&EG912Y_Series_PPP_Application_Note 9 / 27

3.2. Recommended Procedures for PPP Setting

Connect_Count<

Power on the

module

AT+CPIN?

Query (U)SIM

card status

AT+CGREG?

Query PS network

1. Set APN by AT+CGDCONT

2. Start PPP dialing by ATD*99#

Return CONNECT

MCU got IP and

DNS

Data transmission

MCU sends

PPP

Terminate-

Request

packet

Connect_Count++

Recommended Power-on/off:

For details of the recommended

power-on/off methods of each

applicable module, see their

Hardware Design documents

respectively.

Exit from the PPP dialing if (U)SIM

card is not ready in 20 s.

(U)SIM card is ready

Query (U)SIM Card Status:

AT+CPIN. Reboot the module if it

fails to detect (U)SIM card in 20 s with

AT+CPIN?.

APN Configuration:

1. APN must be set by

AT+CGDCONT.

2. Use AT+CGACT? to check

whether the current context has been

activated when AT+CGDCONT

returns error.

Packet Interaction:

1. Exit from the procedure of Packet

Interaction by “+++”.

2. The module will report NO

CARRIER when PPP connection is

terminated.

LCP Negotiation:

1. If UART is used, ensure the baud

rate between MCU and the module is

the same.

AUTH Negotiation:

1. Ensure the type of AUTH is one of

the following two: PAP(0xc023),

CHAP(0xc223).

IPCP Negotiation:

1. Check whether MCU has got legal

IP and DNS address.

2. Check whether the amount of DNS

MCU is equal to the amount

requested by MCU.

3. Terminate PPP connection if IPCP

negotiation between TA and TE is not

completed in 90 s, and then retry PPP

setup.

Exception Handling:

1. Check whether the PPP Terminate-

Request packet is right.

2. Reboot the module if the steps

above do not work.

Start timer when

IPCP negotiation

begins

Succeed to

negotiate IPCP in

90s

NMCU receives

PPP Terminate-

Ack packet in 3 s

Send Count<5

Exception handling

Send Count++

LCP negotiation

AUTH negotiation

IPCP negotiation

Packet Interaction

1. Synchronization between TE and TA.

2. Fix and save baud rate by AT+IPR=xxx&W. If

USB modem port is used, this could be ignored.

Network:

1. It indicates that the module has

registered on network when

AT+CREG? returns 1 or 5.

2. Reboot the module if it fails to

Exit from the PPP dialing if

the module fails to register

on network in 60s AT+CREG?

Query network

status

PS Network:

1. It indicates that the module has

registered on PS when AT+CGREG?

returns 1 or 5.

2. It is able to go to next step without

registering on PS in 60 s.

Figure 3: Flowchart of Recommended Procedures for PPP Setting

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