Ebyte E70-433NW3S0 User manual

E70-433NW30S User Manual
433MHz 1W Star Network SMD Wireless Module

Chengdu Ebyte Electronic Technology Co,;Ltd E70-433NW30S user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 1
CONTENT
1. OVERVIEW.......................................................................................................................................................... 2
1.1 INTRODUCTION...................................................................................................................................................2
1.2 FEATURES......................................................................................................................................................................2
2. SPECIFICATION AND PARAMETER.............................................................................................................3
2.1 LIMIT PARAMETER.........................................................................................................................................................3
2.2 OPERATING PARAMETER................................................................................................................................................3
3 SIZE AND PIN DEFINITION................................................................................................................................. 4
4 CONNECT TO MCU................................................................................................................................................ 7
5 FIRMWARE TRANSMITTING MODE................................................................................................................7
5.1 TRANSPARENT TRANSMISSION.....................................................................................................................................7
5.2 SHORT ADDRESS TRANSMISSION................................................................................................................................. 7
5.3 LONG ADDRESS TRANSMISSION...................................................................................................................................8
6.DEVICE STATUS...................................................................................................................................................... 8
6.1 AUX DESCRIPTION........................................................................................................................................................ 8
6.2 LINK DESCRIPTION....................................................................................................................................................... 9
6.3 ACK DESCRIPTION...................................................................................................................................................... 10
7.OPERATING MODE..............................................................................................................................................10
DORMANT NODE................................................................................................................................................................10
7.1.COORDINATOR MODE.................................................................................................................................................. 10
7.2.NORMAL NODE............................................................................................................................................................ 11
7.3.DORMANT NODE..........................................................................................................................................................11
7.4 CONFIGURATION MODE............................................................................................................................................. 11
7.5 MODE SWITCHING........................................................................................................................................................11
8.QUICK START........................................................................................................................................................12
8.1 COMMUNICATION BETWEEN NORMAL NODE AND COORDINATOR................................................................................12
9. ATC COMMAND................................................................................................................................................... 15
10. HARDWARE DESIGN........................................................................................................................................20
11 FAQ......................................................................................................................................................................... 21
11.1 COMMUNICATION RANGE IS TOO SHORT................................................................................................................... 21
11.2 MODULE IS EASY TO DAMAGE...................................................................................................................................22
11.3 BER(BIT ERROR RATE)IS HIGH................................................................................................................................22
12.PRODUCTION GUIDANCE............................................................................................................................... 22
12.1.REFLOW SOLDERING TEMPERATURE.........................................................................................................................22
12.2 REFLOW SOLDERING CURVE.................................................................................................................................. 23
13. E70 SERIAL..........................................................................................................................................................23
14. ANTENNA RECOMMENDATION....................................................................................................................23
15. PACKAGE FOR BATCH ORDER.................................................................................................................... 24
REVISION HISTORY................................................................................................................................................25
ABOUT US.................................................................................................................................................................. 25

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1. Overview
1.1 Introduction
E70-433NW30S is the star network module, operating at
433MHz, based on originally imported TI CC1310 and 15.4-Stack
protocol, with coordinator and terminal as a whole. The module
features with long range and high-speed transmission modes.
Maximum 200 nodes can send data to one coordinator. Use
industry-standard AT commands for operating configuration,
which greatly simplifies user operations. With stable batch production, the module is suitable for various wireless
communication network applications.
E70-433NW30S is the first 433MHz wireless module which meets IEEE 802.15.4 in China and solves a series of
problems caused by the traditional 433MHz module. Users will no longer spend more effort to deal with complex
network protocols, which greatly reduces the difficulty of customer development and shortens the user's development
cycle. The protocol guarantees the stability and packet rate of the entire wireless communication system.
E70-433NW30S strictly follows design standards of FCC, CE, CCC and meets various RF certification
requirements for exporting.
1.2 Features
Communication distance tested is up to 6.5km
Maximum transmission power of 1W, software multi-level adjustable；
Support the global license-free ISM 433MHz band；
Support air date rate of 5kbps～50kbps；
Support CSMA/CA, Carrier multi - channel interception technology which can avoid collision effectively
Maximum 200 nodes, no need to deal with complicated protocol.
Adopting AES128 data encryption, Ensure the reliability of data packets.
Supports DSSS technology, like LoRa, better than GFSK.
Low power consumption for battery supplied applications；
Can achieve up to 115200bps continuous frame unlimited-packet length transmission
Support 3.3V~5.2V power supply, power supply over 3.3V can guarantee the best performance；
Industrial grade standard design, support -40 ~ 85 °C for working over a long time；
IPEX access point, stamp hole is optional, facilitate user secondary development, facilitate integration.

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1.3 Application
Home security alarm and remote keyless entry；
Smart home and industrial sensors；
Wireless alarm security system；
Building automation solutions；
Wireless industrial-grade remote control；
Health care products；
Advanced Meter Reading Architecture(AMI)；
Automotive industry applications.
2. Specification and parameter
2.1 Limit parameter
Main parameter
Performance
Remarks
Min.
Max.
Power supply（V）
0
5.2
Voltage over 5.2V will cause permanent
damage to module
Blocking power（dBm）
-
10
Chances of burn is slim when modules
are used in short distance
Operating temperature（℃）
-40
85
2.2 Operating parameter
Main parameter
Performance
Remark
Min
Typ.
Max.
Operating voltage（V）
3.3
5.0
5.2
5.0V is recommended
Communication level（V）
3.3
For 5V TTL, it may be at risk of
burning down
Operating temperature（℃）
-40
-
85
Industrial design
Operating frequency（MHz）
431
-
446.5
Support ISM band
Power
consumption
Transmitting current [mA]
610
Instant power consumption
Receiving current [mA]
13
Turn-off current [μA]
2
Software is shut down
Max Tx power（dBm）
29.6
30.0
31.3
Receiving sensitivity（dBm）
-109
-110
-111
Air data rate is 5kbps
Air data rate（bps）
5k
5k
50k
Controlled via user’s programming

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Main parameter
Description
Remark
Distance for reference
6500m
Test condition：clear and open area, antenna gain: 5dBi，
antenna height: 2.5m，air data rate: 5kbps
TX length
Transmission mode specification
See transmission mode for details
Buffer
512 Byte
A single packet may not exceed 128 bytes
Modulation
GFSK
Communication interface
UART
Package
SMD
Connector
1.27mm
Size
24*38.5mm
Antenna
IPX/Stamp hole
50 ohm impedance
3 Size and pin definition

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No.
Pin item
Pin direction
Application
1
GND
Ground
Ground electrode
2
GND
Ground
Ground electrode
3
GND
Ground
Ground electrode
4
NC
Reserved pin
Reserved, to be floated
5
NC
Reserved pin
Reserved, to be floated
6
NC
Reserved pin
Reserved, to be floated
7
NC
Reserved pin
Reserved, to be floated
8
NC
Reserved pin
Reserved, to be floated
9
NC
Reserved pin
Reserved, to be floated
10
NC
Reserved pin
Reserved, to be floated
11
NC
Reserved pin
Reserved, to be floated
12
NC
Reserved pin
Reserved, to be floated
13
NC
Reserved pin
Reserved, to be floated
14
NC
Reserved pin
Reserved, to be floated
15
NC
Reserved pin
Reserved, to be floated
16
LINK
output
For indicating the current network connection status of the module, it can be
configured as drain open circuit output or push-pull output. For details, please refer
to the parameter setting, a 1K protection resistor shall be connected in series
externally (it can be suspended).
17
GND
Ground
Ground electrode
18
NC
Reserved pin
Reserved, to be floated
19
NC
Reserved pin
Reserved, to be floated
20
NC
Reserved pin
Reserved, to be floated
21
NC
Reserved pin
Reserved, to be floated
22
TCKC
Input
JTAG TCKC
23
TMSC
Input
JTAG TMSC
24
RESET
Input
Module reset pin, low level effective
25
NC
Reserved pin
Reserved, to be floated
26
M0
Input
M1M0 The four working modes of the module are determined by the joint
combination. When in use, a 1K protection resistor shall be connected in series
externally, and a 1M pull-up resistor shall be added (it shall not be suspended,
otherwise, it can be grounded).
27
M1
Input
M1M0 The four working modes of the module are determined by the joint
combination. When in use, a 1K protection resistor shall be connected in series
externally, and a 1M pull-up resistor shall be added (it shall not be suspended,
otherwise, it can be grounded).
28
VCC
Power supply：2.6V ~ 5.5V DC
29
VCC
Power supply ：2.6V ~ 5.5V DC
30
GND
Ground
Ground electrode
31
GND
Ground
Ground electrode
32
ACK
Output
The user indicates the data transmission result of the module, which is pulled down

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before transmission and pulled up after success. It can be configured as drain open
circuit output or push-pull output. When it is used, a 1K protection resistor should be
connected externally in series (it can be suspended).
33
NC
Reserved pin
Reserved, to be floated
34
NC
Reserved pin
Reserved, to be floated
35
NC
Reserved pin
Reserved, to be floated
36
RXD
Input
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can be
configured as open-drain or pull-up input.
37
TXD
Output
TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can be
configured as open-drain or push-pull output
38
AUX
Output
To indicate module ’ s working status & wakes up the external MCU. During the
procedure of self-check initialization, the pin outputs low level. Can be configured as
push-pull output (suspending is allowed).
39
NC
Reserved pin
Reserved, to be floated
40
NC
Reserved pin
Reserved, to be floated
41
NC
Reserved pin
Reserved, to be floated
42
TX_EN
Output
Internal single chip microcomputer control PA pin, high level effective, connected 45
pin
43
RX_EN
Output
Internal single chip microcomputer control LNA pin, high level effective, connected
44 pin
44
RX_EN
Input
Internal single chip microcomputer control LNA pin, high level effective, connected
43 pin
45
TX_EN
Input
Internal single chip microcomputer control PA pin, high level effective, connected 42
pin
46
GND
Ground
Ground electrode
47
GND
Ground
Ground electrode
48
ANT
Antenna 50 ohm impedance
This product can achieve Pin compatibility, Pin to Pin replacement

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4 Connect to MCU
No.
Description（STM8L MCU）
1
The UART module is TTL level., please collect with MCU.
2
For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
5 Firmware Transmitting mode
5.1 Transparent transmission
Format
Values
When the coordinator is set to transparent transmission, the coordinator will send broadcast message. At this time, all non-dormant nodes in the entire
network will receive data.
5.2 Short address transmission
Format
Values
Coordinator short address transmission format: short address + valid data 00 00 or FF FF are broadcast address
Coordinator
HEX
Sending：00 01 AA BB CC
Node A address 00 01
HEX
Receiving：AA BB CC
Node B address 00 02
HEX
Null
Node C address 00 03
HEX
Null
Coordinator
HEX
FF FF AA BB CC
Node A address 00 01
HEX
AA BB CC

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Node B address 00 02
HEX
AA BB CC
Node C address 00 03
HEX
AA BB CC
5.3 Long address transmission
Format
Values
Coordinator short address transmission format: short address + valid data
00 00 00 00 00 00 00 00 00 or FF FF FF FF FF FF FF FF are broadcast address;
Coordinator
HEX
Sending：0A 01 AA 45 65 13 12 44 AA BB CC
Node A address:
0A 01 AA 45 65 13 12 44
HEX
Receiving：AA BB CC
Node B address：
0D 55 18 42 1A 27 29 64
HEX
Null
Node C address:
A4 78 02 46 B5 1C 5A 02
HEX
Null
Coordinator
HEX
FF FF FF FF FF FF FF FF AA BB CC
Node A address:
0A 01 AA 45 65 13 12 44
HEX
AA BB CC
Node B address:
0A 01 AA 45 65 13 12 44
HEX
AA BB CC
Node C address:
0A 01 AA 45 65 13 12 44
1 HEX
AA BB CC
6.Device status
No
Description（STM8L MCU）
1
The UART module is TTL level.
2
For some MCU works at 5V DC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
6.1 AUX description
It can indicate whether there are data that are yet to send via wireless way, or whether all wireless data has been sent
through UART, or whether the module is still in the process of self-check initialization.
No.
Description

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1
【Indication of UART output】can be used to wake up external MCU.
2
【Indication of wireless transmitting】
1.The length of the buffer is 512 bytes, and the single packet must not exceed 128 bytes,
when Aux=1, users can transmit data continuously within 128 bytes.
2.When AUX = 1, it means that all the UART data of the module have been transmitted already.
6.2 LINK description
The LINK pin indicates the current network status, after the node is connected to the network, the current pin is
pulled low. The external device can query the device network status through the pin level. In the coordinator mode,
the pin indicates if the module establishes the network normally.

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6.3 ACK description
The ACK pin is used to indicate the status of the last user’s data transmission. Before transmitting, the pin is pulled
low. After the transmission is successful, the pin is pulled high. The user can use this pin state to judge if the data
has arrived successfully. This pin function cannot indicate the coordinator to send broadcast message.
Note: In 802.15.4 protocol, the device will use the CSMA/MA technology to access the channel before sending data.
When the receiving device receives the data, the returned ACK does not have this mechanism. This means that even
if the receiving device can receive data in extreme conditions, sending device ACK pin indicates that the last data
transmission failed.
7.Operating mode
7.1.Coordinator mode
If the user configures the operating mode 4,（M0=0,M1=0）or the user configures the operating mode as 0, the module
works in the coordinator mode. In the coordinator mode, the coordinator can set up the network, coordinator is the central
node of the network, there must be a coordinator in the network.
The coordinator configurable data input mode is:
Broadcast transmission. When configured to broadcast, all non-dormant devices on the entire network will receive data.
The ACK pin indicates transmission successfully all the time.
Short address transmission, when configured to short address transmission, the user must specify the short address before
sending data.
M1
M0
Description
Remarks
Coordinator mode
0
0
Set up a network to manage network node
information
Transfer data according to input and output modes
Normal node
0
1
Send and receive data at any time
High real-time performance
Dormant node
1
0
Low-power reception, sending data at any
time
Receive delay, send need to wake up the serial port
Sleep mode
1
1
Cannot send and receive data, system
sleeps
The fixed baud rate is 115200 8N1

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Long address transmission. When configured to long address transmission, the user must specify the long address before
sending data.
7.2.Normal node
If the user configures the operating mode 4,（M0=0,M1=1）or the user configures the operating mode as 1, the module
works in the normal node mode. In the normal node mode, the data can be received and sent in real time. It is suitable for
application with low power consumption but high real-time requirement.
7.3.Dormant node
If the user configures the operating mode as 4, M0=1,M1=0, or the user configures the operating mode as 2, the module
works in the dormant node mode, the device request if there is data transmitted by coordinator according to the
user-configured sleep period , The non-broadcast data sent by the coordinator will be temporarily stored inside the
coordinator. The device is in low power consumption during the sleep period. If the sleep node wants to send data
actively, the user should send no more than two bytes to wake up the device. After the byte data is used to wake up the
device and the wake-up byte is sent, the user needs to wait for more than 100ms to send the real data. After the wake-up
byte is sent, the user needs to wait for 100ms to send the real data and the wake-up data will be discarded. After the
device was waken up, the module will open the serial port, receiving AT command, if more than 2 seconds, there is no
data input, the module will close serial port and go to sleep.The sleep node is suitable for applications where the user
requires high power consumption but does not require high real-time data.
7.4 Configuration mode
When M0=1,M1=1,the device will switch to configuration mode. In the this mode, the serial port parameters are:
115200, 8N1, and the average operating current is 2uA. In this mode, the module cannot send and receive data. When the
external AT instruction is configured, needs the serial port to send no more than two bytes data to wake up the
device .After the wake-up byte is sent, the user needs to wait for 100ms to send the real data and the wake-up data will be
discarded. After the device was waken up, the module will open the serial port, receiving AT command, if more than 2
seconds, there is no data input, the module will close serial port and go to sleep. The next AT command requires the user
to resend the wake-up byte.
7.5 Mode switching
No
Remarks
1
The user can decide the operating mode by the combination of M1 and M0
2
In any work mode, the user can configure the operating mode through the AT command
3
When M0=1,M1=1, the serial port parameters are 115200, 8N1(fixed)

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8.Quick start
8.1 Communication between normal node and coordinator
Coordinator configuration
Open the serial port assistant, select the serial port corresponding to the device, and set the serial port parameters
(default is 115200, 8N1)
Enter "+++" without line breaks to enter the AT command mode. When receiving "Enter AT Mode", the AT mode is
successfully entered. As shown in Figure 5-1:
Enter "AT+HELP" with line breaks to see all instructions. As shown in Figure 1:
Figure 1
Then enter "AT+WMCFG=0" with line breaks to configure the device as the coordinator mode, as shown in Figure
2:
Figure 2
Then enter “AT+RSTART” to restart the device with a line break. The coordinator configuration is complete. As

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shown in Figure 3:
Figure 3
Normal node configuration
Open the serial port assistant and select the serial port corresponding to the device. Set the baud rate to 115200, the
data bit to 8 bits, the parity bit to none, the stop bit to 1 bit, and the flow control is disabled, open the serial port.
Enter "+++" without line breaks to enter the AT command mode. When receiving “Enter AT Mode", the AT mode is
successfully entered.
Enter "AT+HELP" with line breaks to see all instructions. As shown in Figure 4:
Figure 4
Then enter "AT+WMCFG=1" with line breaks to configure the device as the coordinator mode, as shown in Figure
5:
Figure 5
Then enter “AT+RSTART” to restart the device with a line break. The coordinator configuration is complete.
As shown in Figure 5-6:

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Figure 6
Network transmission data transmission
When the configuration is complete, the coordinator restarts and the DIO11 pin is asserted low, indicating that the
coordinator has started and is running. After an normal node device starts up, it will have a network access time of 10
to 20 seconds. When the network access is completed, the DIO11 pin will be set to low level, indicating that the
network access is successful.
After waiting for the device to access the network successfully, the coordinator enters to AT mode, enters the
command "AT+DINFO=ALLNODE" with a newline character, the coordinator will return the short address and long
address of all the nodes that have already entered the network and recorded. As shown in Figure 5-7:
Figure 7
At this time, use “AT+EXIT” to exit the AT command mode with a newline character, and reclaim “Exit AT Mode”
to exit AT mode. Next can transfer data, as shown in Figure 8:
Figure 8
The coordinator and node devices can communicate with each other normally.

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9. AT Command
When the serial port enters AT mode, it needs to open the serial port assistant, set the serial port (default parameter) baud
rate 115200, data bit 8 bit, stop bit 1 bit, open the serial port, input "+++" without carriage return. All parameter settings
will reply "\r\n+OK\r\n".
1
Enters” +++” into AT Command
+++
Parameter Description:
Nonparametric
Response:
Enter AT Mode
Example：+++
Note: 1. The AT command can be used only after entering the AT command mode
2. After entering the AT command mode, the AT command mode can be used again only after exiting the AT command mode, reset or
restart the module
3. When writing this instruction, the serial debugging assistant must be set not to send new lines; writing other AT commands must be set
to send new lines.
2
AT+EXIT Exit AT command mode
AT+EXIT
Parameter Description:
Null
Response:
Exit AT Mode
Example：AT+EXIT
Note: AT commands are invalid after exiting AT command mode
3
AT+HELP Help command
AT+HELP
Parameter Description:
Null
Response:
All instructions and help information
Example：AT+HELP
4
AT+ WMCFG Setting /Querying working mode (reboot valid)
AT+ WMCFG =?
Description:
Gets working mode
Response：
WMCFG：4
AT+ WMCFG =Value
Description:
Value：0~4
0，Coordinator；
1, Normal node;

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2, Dormant Node；
3, Sleep mode；
4, (factory default), dial switch control
Example：AT+ WMCFG =4
Note: 1. After setting a new mode, it needs to be reset or power off and restart
5
AT+DINFO Get facility information
AT+DINFO=ALLNODE
Description:
Query the short and long address of all node, and return by UART.
It works only when the device works in the coordinator mode
AT+DINFO=SELFS
Description:
Get short address and return by UART
AT+DINFO=SELFE
Description:
Get long address and return by UART
Example：AT+DINFO=SELFE
6
AT+ TFOCFG Setting/Querying output format configuration (reboot valid)
AT+ TFOCFG=？
Description:
Gets output format configuration
Response：
TFOCFG:0
AT+ TFOCFG=Value
Description:
Value：0~7
0：Output: valid data (transparent transmission)）
1: Output: Valid Data +Long Address
2：Output: Valid Data +Short Address
3：Output: Valid Data+RSSI
4：Output：Valid Data+Long Address+Short Address
5：Output：Valid Data+Long Address+RSSI
6：Output：Valid Data+Short Address+RSSI
7：Output：Valid Data+Long Address+Short Address+RSSI
Example：AT+ TFCFG=0
7
AT+ TFICFG Setting/Querying input transmission format configuration (reboot valid)
AT+ TFICFG=？
Description:
Gets input transmission format configuration
Response：
TFICFG:0
AT+ TFICFG=Value
Description:

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（This instruction is valid for coordinator only）
Value：0~2
0：Input Broadcast(Only the coordinator works)
1：Input Short Address+Data (0x0000 0xfff) are broadcast address
2：Input Long Address+Data
（0x000000000000 0xffffffffffffffff）are broadcast address
Example：AT+TFICFG=0
8
AT+TMCFG Setting/Querying transport mode configuration (reboot valid)
AT+TMCFG=?
Description:
Gets transport mode configuration
Response：
TMCFG:0
AT+TMCFG=Value
Description：
Value：0 or 1
0：Long Range mode，LRM
1：Standard transmission mode,GFSK
Example：AT+TMCFG=0
Note: The coordinator and node should have the same transmission mode before they can access the network.
9
AT+ PIDCFG Setting/Querying PANID configuration（reboot valid）
AT+PIDCFG=？
Description:
Gets PANID configuration
Response：
PIDCFG:65535
AT+PIDCFG=Value
Description:
Value:0~65535
Example：AT+PIDCFG=65535
Note: The node can only join the same network as its PANID (any network can be added when it is configured as 65535)
10
AT+ DMCFG Setting/Querying dormancy time configuration(reboot valid)
AT+DMCFG=？
Description:
Gets dormancy time configuration
Response:
DMCFG:0~60
AT+DMCFG=Value
Description: Configure wakeup period of sleep node
Value: dormant time, per unit second (S). 0~60 S.
Note: When configured as 0, the node will never wake up, that is, the node cannot receive
data but can upload data
Example：AT+DMCFG=0
11
AT+RSCFG Setting/Querying the reboot parameter configuration

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(reboot valid)
AT+RSCFG=?
Description:
Gets the reboot parameter configuration
Response：
RSCFG:0
AT+RSCFG=Value
Description:
Value：0 or 60~65535（S）
When the value less than 60s, the system judges 60, equals 0s, does not restart
Example：AT+RSCFG=0
Note: This parameter can be used for node disconnection detection. It is recommended to open it.
12
AT+UBCFG Setting /Querying the baud rate parameter (reboot valid)
AT+UBCFG=?
Description：
Obtains the baud rate parameter
Response：
UBCFG:7
AT+UBCFG=Value
Description：
Value:0~7
0：1200
1：2400
2：4800
3：9600
4：19200
5：38400
6：57600
7：115200
Example：AT+UBCFG=7
13
AT+UPCFG Setting /Querying the device parity parameter (reboot valid)
AT+UPCFG=?
Description
Gets the device parity parameter
Response：
UPCFG:0
AT+UPCFG=Value
Description：
Value:0~2
0：None
1：Odd parity
2：Even parity

Chengdu Ebyte Electronic Technology Co,;Ltd E70-433NW30S user manual
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Example：AT+UPCFG=0
14
AT+PWCFG Setting /Querying the power parameter(reboot valid)
AT+PWCFG=?
Description：
Gets the power parameter
Response：
PWCFG:3
AT+PWCFG=Value
Description：
Value:0~3
0：Polar Altitude
1：High
2：Medium
3：Low
Example：AT+ PWCFG=3
15
AT+IOCFG Setting /Querying the IO parameter
AT+IOCFG=?
Description：
Gets the IO parameter
Response：
IOCFG:0
AT+IOCFG=Value
Description：
Value：0 or 1
0：Push-pull
1：open-drain
Example：AT+IOCFG=0
16
AT+DFCFG Restore the default parameter
AT+DFCFG
Description：Null
Restore the default parameter
Example：AT+DFCFG
17
AT+RSTART Device Restart
AT+RSTART
Description：Null
Device Restart
Example：AT+RSTART
18
AT+ECHO Sets up the AT instruction to turn off the back display
AT+ECHO=Value
Description:
Value:0 or 1
1：Close the echo
0：Open the echo