Ebyte E104-BT40 User manual

E104-BT40 User Manuel
Dual-mode Bluetooth Module V4.2 Protocol

Chengdu Ebyte Electronic Technology Co.,Ltd. E104-BT40 User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd.
1
CONTENTS
1. OVERVIEW..............................................................................................................................................................3
1.1 BRIEF INTRODUCTION................................................................................................................................................... 3
1.2 FEATURES......................................................................................................................................................................3
1.3 APPLICATION.................................................................................................................................................................3
2. SPECIFICATION AND PARAMETER................................................................................................................ 4
2.1 LIMIT PARAMETER.........................................................................................................................................................4
2.2 OPERATING PARAMETER............................................................................................................................................... 4
3. SIZE AND PIN DEFINITION................................................................................................................................ 5
4. QUICK START.........................................................................................................................................................6
4.1 QUICK START GUIDE.....................................................................................................................................................7
4.2 CONFIGURATION OVER AIR............................................................................................................................................8
4.3 DATA TRANSMISSION...................................................................................................................................................10
4.3.1 SPP Data transparent transmission.................................................................................................................... 10
4.3.2 BLE Data transparent transmission.................................................................................................................... 11
4.4 OTHERS....................................................................................................................................................................... 13
5.FUNCTION DESCRIPTION.................................................................................................................................13
5.1 CONFIGURATION..........................................................................................................................................................13
5.2 MAC ADDRESS BINDING............................................................................................................................................ 13
5.3 STATUS OR EVENT PRINTING........................................................................................................................................13
5.4 CLASSIC BLUETOOTH PAIRING....................................................................................................................................13
5.5 UUID DESCRIPTION....................................................................................................................................................14
5.6 PACKAGE MECHANISM................................................................................................................................................ 14
6. AT COMMAND......................................................................................................................................................15
6.1 DEFAULT PARAMETERS............................................................................................................................................... 15
6.2 COMMAND DESCRIPTION.............................................................................................................................................15
6.3 AT COMMAND ERROR CODE DESCRIPTION..................................................................................................................16
6.4 COMMAND LIST...........................................................................................................................................................17
6.4.1 AT Test command................................................................................................................................................. 17
6.4.2 AT+RESET Reset command................................................................................................................................ 17
6.4.3 AT+RESTORE Restore factory command........................................................................................................... 17
6.4.4 AT+BAUDABT On/Off any baud rate setting.................................................................................................. 17
6.4.5 AT+BAUD Serial port baud rate......................................................................................................................... 18
6.4.6 AT+HWFC Flow control..................................................................................................................................... 18
6.4.7 AT+DEVSWVER Software version number........................................................................................................ 19
6.4.8 AT+SPPNAME SPP Name.................................................................................................................................. 19
6.4.9 AT+BLENAME BLE Broadcast name................................................................................................................. 19
6.4.10 AT+MAC SPP MAC Address............................................................................................................................. 19
6.4.11 AT+PAIRMODE Classic Bluetooth pairing mode............................................................................................. 20
6.4.12 AT+PIN Classic Bluetooth pairing code........................................................................................................... 20
6.4.13 AT+P02 P02 Output.......................................................................................................................................... 21
6.4.14 AT+P03 P03 Output.......................................................................................................................................... 21
6.4.15 AT+P10 P10 Input............................................................................................................................................. 21
6.4.16 AT+P11 P11 Input............................................................................................................................................. 22

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6.4.17 AT+PWM2 PWM2 Output................................................................................................................................. 22
6.4.18 AT+PWM3 PWM3 Output................................................................................................................................. 22
6.4.19 AT+DISCON Disconnect the current connection............................................................................................. 23
6.4.20 AT+LOGMSG Running status output................................................................................................................ 23
6.4.21 AT+CLOSESPP Close SPP............................................................................................................................... 23
6.4.22 AT+OPENSPP Open SPP................................................................................................................................. 23
6.4.23 AT+STATE Query Bluetooth state..................................................................................................................... 24
6.4.24 AT+BOND Binding enable................................................................................................................................ 24
6.4.25 AT+BONDMAC Binding MAC Address..................................................................................................... 24
6.4.26 AT+PASSKEY Enter pairing key....................................................................................................................... 25
6.4.27 AT+CONFIRM Classic Bluetooth password verification................................................................................. 25
6.4.28 AT+AUTH Air configuration password verification......................................................................................... 25
6.4.29 AT+UPDAUTH Reset authentication password............................................................................................... 26
6.4.30 AT+UUID Query UUID.................................................................................................................................... 26
6.4.31 AT+UUIDSVR Bluetooth service UUID........................................................................................................... 26
6.4.32 AT+UUIDCHARA1 SLAVE CHANNEL Characteristic UUID......................................................................... 26
6.4.33 AT+ UUIDCHARA2 MASTER CHANNEL Characteristic UUID.................................................................... 27
7. HARDWARE DESIGN......................................................................................................................................... 27
8. FAQ.......................................................................................................................................................................... 28
8.1 COMMUNICATION RANGE IS TOO SHORT..................................................................................................................... 28
8.2 MODULE IS EASY TO DAMAGE.....................................................................................................................................28
8.3 BIT ERROR RATE IS TOO HIGH......................................................................................................................................28
9. WELDING OPERATION GUIDANCE.............................................................................................................. 29
9.1 REFLOW SOLDERING TEMPERATURE...........................................................................................................................29
9.2 REFLOW SOLDERING CURVE.......................................................................................................................................29
10. BATCH PACKAGING........................................................................................................................................30
REVISION HISTORY............................................................................................................................................... 30
ABOUT US..................................................................................................................................................................30

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1. Overview
1.1 Brief Introduction
E104-BT40 module is a serial to dual-mode Bluetooth slave module based
on Bluetooth 4.2 + 3.0 version, namely low power consumption Bluetooth BLE
and classic Bluetooth SPP Profile, which can freely switch between BLE and
Classic Bluetooth, working at 2.4GHz.
The E104-BT40 module uses general AT commands to set parameters, and
the operation is simple and fast. The module only supports the Bluetooth slave
role.
Through this module, traditional low-end serial devices or
MCU-controlled devices can perform wireless data transmission. It is a low cost, simple and reliable data transmission
module.
1.2 Features
Bluetooth Specification V4.2 +3.0 protocol available；
AT command configuration available;
Support BLE；
SPP 3.0；
GPIO input / output;
2-way PWM outputs;
249 bytes of serial buffer;
Effective communication distance over 30 meters;
Global license-free ISM 2.4GHz frequency band;
1 ~ 2Mbps air rate;
Built-in PCB on board antenna, no external antenna required.
1.3 Application
Bluetooth wireless data transmission;
Wireless meter reading and wireless sensing;
Smart home, industrial control;
Industrial remote control and telemetry;
Smart buildings, smart construction;
Automatic data collection;
Health sensor;
Automotive testing equipment;
Smart robot.

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2. Specification and Parameter
2.1 Limit parameter
Main Parameter
Performance
Note
Min
Max
Voltage supply [V]
0
3.6
Voltage over 3.6V 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
Industrial grade
2.2 Operating parameter
Main parameter
Performance
Note
Min
Typ
Max
Operating voltage[V]
2.5
3.3
3.6
≥3.3 V ensures output power
Communication level [V]
-
3.3
-
For 5V TTL, it may be at risk of burning
down
Operating temperature [℃]
-40
-
+85
Frequency [MHz]
2400
-
2480
Power
consumption
Idle state （mA）
3.9
-
6
BLE connection
（mA）
-
3.26
9.2
SPP connection
（mA）
-
6.78
9.2
Transmitting power [dBm]
-
3
-
Receiving sensitivity [dBm]
-
-96
-97
Main parameter
Description
Note
Reference distance
30m
Transmission length
SPP 100Bytes
BLE 20Bytes
SPP payload 100 bytes
BLE payload 20 bytes
Bluetooth protocol
V4.2+V3.0 SPP
Communication interface
UART
All I / Os of the microcontroller are exported, see the chip manual
for details
Package
SMD
Connector
1.27mm
Size
21*13mm
Antenna
PCB
50Ω Impedance

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3. Size and pin definition
Pin No.
Definition
Direction
Function
Description
1
GND
-
Power supply
Power supply reference
2
TXD
Output
Serial data
transmission
Module outputs serial data to external
3
RXD
Input
Serial data
reception
Module receives external serial data
4
P02
Output
General output IO
User can set output level
5
P03
Output
General output IO
User can set output level①
6
P04
-
-
NC
7
P05
-
-
NC
8
P06
-
-
NC

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9
P07
-
-
NC
10
GND
-
Power supply
Power supply reference
11
P10
Input
General input IO
User can read IO level,internal pull-up
12
P11
Input
General input IO
User can read IO level,internal pull-up
13
PWM2
Output
Output PWM
User configures output PWM wave
14
PWM3
Output
Output PWM
User configures output PWM wave②
15
P33
-
CTS
16
P34
-
RTS
17
VCC
-
3.3V
Power supply input
18
GND
-
Power supply
Power supply reference
19
GND
-
Power supply
Power supply reference
20
NC
-
-
21
NC
-
-
22
NC
-
-
23
RST
-
Reset pin
Active low level
24
STATUS
Output
State indicator
LED
Bluetooth is not connected: output frequency is 1Hz square wave
Bluetooth is connected: Low level
25
MODE
Input
Mode selection
High level: configuration mode ③
Low level: transparent transmission mode
26
DISC
Input
Disconnection
Internal pull-up, valid on falling edge
l27
LINK
Output
Connection state
Bluetooth is not connected: high level
Bluetooth is connected: Low level
28
GND
-
Power supply
Power supply reference
1The user can configure output IO default output low level. After setting, the output level will still be output
according to the set parameters after the next power-on;
2The PWM is turned off by default. After setting, the PWM will still be output according to the set parameters after
the next power-on;
3Mode pin switching mode is only valid after connection established.
4. Quick start
Debug / test recommended software recommended:
PC serial port tool -SSCOM.exe or AccessPort
Mobile terminal ble debugging APP BLE-nRF connect Classic Bluetooth-Bluetooth serial assistant

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4.1 Quick start guide.
The AT command mode is used when the module is not connected. When the connection is established, the module
enters transparent transmission mode, the AT command mode can be entered by pulling the MODE pin low, and
return to transparent transmission mode by pulling the MODE pin high.
Set related configuration of the serial tool (default configuration: 115200,8,1, none, none), as shown in the diagram
below:
Diagram 4-1-1 SSCOM Parameter configuration
Diagram 4-1-2 AccessPort Parameter configuration, other parameters default
Send the AT command to configure module according to the instructions shown in the 6.4 instruction diagram and
the instructions in section 6.2

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4.2 Configuration over air
Configuration over air can be used only when BLE role is connected.
Open the APP “nRF connect”, start scanning the device, find the device "CDEBYTE_BLE" and connect it.
Diagram 4-2 nRF connect scan list diagram
Open the service UUID of FFIO and open the configuration channel write

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Diagram 4-3 nRF connect Connect and open channel write
Send authentication command: AT+AUTH=123456, the module returns “0x2B-4F-4B-0D-0A”to indicate that the
authentication is successful
Diagram 4-4 RF connect Aerial configuration process
Configure the module according to the instructions shown in the instruction diagram in section 6.4 and the
instruction description in section 6.2

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Refer to the instruction diagram in section 6.4 for the returned message format. Some instruction may display
several 0x00, which can be ignored.
When the message returned by an Apple user is too long, such as querying the Bluetooth name, it may only display
22 bytes depending on the APP. In this case, please limit the set value to a reasonable length.
4.3 Data transmission
Module powered on, classic Bluetooth and BLE are both discoverable. Please refer to section 5.2 for data transmission
precautions.
Test Conditions:
Use mobile phone as master and module as slave
Serial port tool: SSCOM or AccessPort
Other parameters are default configuration
4.3.1 SPP Data transparent transmission
1. Power on the module and enable serial printing (AT + LOGMSG = 1);
2. Open the Bluetooth serial assistant and search for the Bluetooth name: CDEBYTE_SPP, connect, serial print STA:
connect: [mac]
Diagram 4-4 Bluetooth serial APP connection process

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3. Print “STA：connected” after the module is successfully connected, and the LINK pin is low.
4. Mobile phone app or open serial port to start data transparent transmission.
4.3.2 BLE Data transparent transmission
1.Power on the module and enable serial port printing (AT + LOGMSG = 1);
2. Open nRF connect, search for the Bluetooth name: CDEBYTE_BLE, connect, serial port print STA: connect: [mac]
Diagram 4-6 Search for BLE device
3. Find "Unknown Service", open the notification, SSCOM sends "1234567890"

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Diagram 4-7 nRF connect Open notifications and receive data
4.nRF connect sends“asdfghjkl”
Diagram 4-8 nRF connect Write data and sending

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4.4 Others
The module can receive AT commands after power on for about 120ms.
It takes 1500ms for the module to power on until Bluetooth initialization is complete.
The recommended interval for BLE disconnection and reconnection is 1500ms.
5.Function description
5.1 configuration
The module supports two configuration modes: serial port configuration and air configuration (BLE). Before air
configuration, the password must be verified by AT + AUTH = 123456 (initial password) and air configuration is only
allowed afterwards. The air configuration authentication cycle is the current connection. If the device is disconnected,
re-connection requires re-authentication.
When disconnected, the module is always in configuration mode. The MODE pin is invalid at this time.
After connected successfully, determine whether the module is currently in configuration mode or data transmission
mode based on the MODE pin level. When the MODE pin is high level, it is a data transmission mode, and when it is
low level, it is a configuration mode.
When the MODE pin detects a valid change, latch the current state. The holding time for each state change is valid
for more than 200ms.
5.2 MAC Address binding
Classic Bluetooth supports MAC address binding. For example, enable MAC address binding, the device only
connects to the set MAC address.
5.3 Status or event printing
The command AT + LOGMSG configures to enable the serial port printing function of status information, which
includes: initialization, connection, disconnection, the format is as follows:
Status
Printing information
Connected
\r\nSTA:connected:[MAC]\r\n
Disconnecte
d
\r\nSTA:disconnected\r\n
5.4 Classic Bluetooth pairing
No.
Pairing mode
Description
AT command

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0
pin code
Pairing code entered by phone
AT+PIN
1
no input output
Pairing request confirmed by phone
-
2
Passkey
passkey entered by Module
AT+PASSKEY
3
confirm
Users confirms by AT instruction
after the module displays "confirmation code"
AT+CONFIRM
Pin code pairing requires a mobile phone or computer terminal to enter PIN code, that is, the PIN code (AT + PIN
command) set by the module, and the connection can be established only after the input is correct. If the host is a module,
the host and the module can set the same PIN code.
No input output pairing, phone confirmation needed only
Passkey pairing: Mobile phone terminal gives 6-bit ASCII code randomly, the module uses AT + PASSKEY
command to enter the 6-bit ASCII code to establish a connection.
Confirm pairing: Mobile phone generates 6-digit ASCII code and sends it to the module. The module prints +
CONFIRM: [6-digit ASCII code] through the serial port. After confirming they are the same, enter AT + COMFIRM =
YES to establish the connection, or AT + COMFIRM = NO to reject the connection request.
5.5 UUID Description
Service UUID
FFF0
Eigenvalue
UUID
Attribute
Description
SLAVE
CHANNEL
FFF1
read/notify
Slave sends data, master receives
data channel
MASTER
CHANNEL
FFF2
read/write
Master sends data,slave receives
the data channel
CONFIG
CHANNEL
FFF3
read/write
Air configuration channel
128-bit UUID is 00 00 xx xx 00 00 10 00 80 00 00 80 5f 9b 34 fb xx xx is 16-bit UUID.
5.6 Package mechanism
Regardless of the baud rate of data transmission, it is recommended to do check retransmit processing at the upper
level.
When E104-BT40 module is in BLE mode, serial port can process a maximum of 100 bytes of data packets at a
time, packed into a packet of 20 bytes. The data packets sent by the mobile device (Android 5.0 or lower) to the module
must be sub-packed (1-20 bytes / packet) and sent. After receiving the data packet, it will be forwarded to the serial port
of the module in turn.

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When E104-BT40 module is in SPP mode, serial port can receive and process a maximum of 249 bytes of data
packets at a time. The data packet sent by the mobile device to the module, please send it by sub-packaging (1-121 bytes
/ packet).
Packing interval description:
BLE inserts 20ms every 20 bytes
spp insert 20ms every 100 bytes
6. AT Command
6.1 Default parameters
Baud rate
115200
Flow Control
Off
Any baud rate setting of serial port
Off
SPP name
CDEBYTE_SPP
BLE name
CDEBYTE_BLE
Pairing code
1234
Pairing mode
1（no input output）
Two-way output IO
Low level
Two-way PWM
Off
Enable MAC binding
Off
Bind MAC
FF FF FF FF FF FF
Status printing
Off
Air configuration password
123456
16-bit Service uuid
FFF0①
16-bit Slave channel uuid
FFF1
16-bit Master channel uuid
FFF2
1:128-bit UUID is 00 00 xx xx 00 00 10 00 80 00 00 80 5f 9b 34 fb
xx xx is 16-bit UUID.
6.2 Command description
All AT commands do not need to return (\ r), line feed (\ n)
The return result of AT command ends with \ r \ n (except for returning HEX). The response in the instruction table in
Section 6.3 ends with \ r \ n.
Command error response format + ERR = [NUM]. (NUM is ASCII)

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6.3 AT Command error code description
Error code return form—ERROR (error code index number)
NUM
Description
Cause
Solution
-0
Command does not
exist
AT Command character error
Check character string
-1
Parameter length
error
1、Parameter total length is too long
2、parameter length is not enough
According to the AT Command manual,
check the parameter length according to
the "Description"
-2
Invalid parameter
Parameter does not meet the value range
View parameter value range by referring
to instruction
-3
Command exists but
does not support the
operation
Only command was entered, error example:
AT + BAUD
Correct example: AT + BAUD?
Compare command and determine
operation
-4
Unconnected
Module is not connected
-
-5
Turn off any baud
rate setting is not
allowed
Turn off the baud rate arbitrarily before
setting the baud rate to a value other than the
normal baud rate
Baud rate is a value other than the normal
baud rate before turning off any setting of
baud rate
Set the baud rate to normal before
turning off any setting of the baud rate
-6
Exceed buffer
length
Input AT command and parameter total
length is too long
Check AT Command and that the total
length of parameter does not exceed 250
bytes
-7
Command invalid
now
-
-
-8
Module is
connected
This command does not support operation in
the connected state
-
-9
No air configuration
authentication
Command can be sent after using AT+AUTH
Command to authentication
-10
Air configuration
authentication failed
Wrong password
1. Use the correct password
2.Reconfigurate via serial port
-11
Unknown error
-

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6.4 Command list
6.4.1 AT Test command
Command
Response
AT
+OK
Description：No
6.4.2 AT+RESET Reset command
Command
Response
AT+RESET
+OK
Description：Immediate effect
6.4.3 AT+RESTORE Restore factory command
Command
Response
AT+RESTORE
+OK
Description：
1. Restart to take effect. After setting successfully, restart immediately;
2.In the process of restoring the factory settings, any kind of reset is prohibited, and the power off is prohibited before the
operation is completed.
6.4.4 AT+BAUDABT On/Off any baud rate setting
Command
Response
Inquiry
AT+BAUDABT?
+OK=[para]
Setting
AT+BAUDABT=[para]
+OK：Success
+ERR=[NUM]：Error
Parameter
para(ASCII)
Description
0
Off(Default)
1
On
Description
Takes effect immediately, save when power off
Before closing any baud rate setting, if the baud rate is not regular, modify it to a regular baud rate and then close

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Example
Open any baud rate setting：AT+BAUDABT=1
6.4.5 AT+BAUD Serial port baud rate
Command
Response
Query
AT+BAUD?
+OK=[para]
Setting
AT+BAUD=[para]
+OK:Success
+ERR=[NUM]:error
Parameter
para(ASCII)
Regular baud rate(bps)
0
4800
1
9600
2
14400
3
19200
4
28800
5
38400
6
57600
7
76800
8
115200(Default)
Turn on any baud rate setting (default is off):
para [ASCII]: Any integer value between 4800 and 115200, including 4800 and 115200.
Description
Restart to take effect，save when power off
Example
Default:
Query: AT + BAUD?
Response: + OK = 8
Setting: AT + BAUD = 1. Set the baud rate to 9600
Response: + OK
When turning on any baud rate setting:
Query: AT + BAUD?
Response: + OK = 9600
Setting: AT + BAUD = 9900
Response: + OK = 9900
6.4.6 AT+HWFC Flow control
Command
Response
Query
AT+HWFC?
+OK=[para]
Setting
AT+HWFC=[para]
+OK：Success

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+ERR=[NUM]：Error
Parameter
para(ASCII)
Description
0
Off(Default)
1
On
Description
Restart to take effect, save when power off
Example
Turn on flow control：AT+HWFC=1
6.4.7 AT+DEVSWVER Software version number
Command
Response
Query
AT+DEVSWVER?
+OK=[para]
Parameter
para(ASCII code):Device software version
Factory default：V1.0
6.4.8 AT+SPPNAME SPP Name
Command
Response
Query
AT+SPPNAME?
+OK=[para]
Setting
AT+ SPPNAME =[para]
+ERR=[NUM]：Error
Parameter
para(ASCII code):SPP name
Factory default:CDEBYTE_SPP
Description
1. It takes effect after restart or BLE disconnect, save when power off
2. The name length is 1~32 bytes
6.4.9 AT+BLENAME BLE Broadcast name
Command
Response
Query
AT+BLENAME?
+OK=[para]
Setting
AT+ BLENAME =[para]
+ERR=[NUM]：Error
Parameter
para(ASCII code):BLE Broadcast name
Factory default:CDEBYTE_BLE
Description
1、It takes effect after restart or BLE disconnect, save when power off
2、ASCII code length is 1~20 bytes
6.4.10 AT+MAC SPP MAC Address
Command
Response