DX DX-BT19-S User manual

User Manual
Product Name: Bluetooth module
Model Name: DX-BT19-S
Manufacture: SHEN ZHEN DX-SMART TECHNOLOGY CO., LTD

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Table Of Contents
1、Overview .................................................................................................................17
2、Module Default Parameters .................................................................................17
3、Application Area....................................................................................................18
4、Power consumption parameters...........................................................................18
5、Radio frequency characteristics...........................................................................18
6、Transparent Transmission Parameters ..............................................................18
7、Module Pin Description And Minimum Circuit Diagram..................................19
8、Pin Function Description ......................................................................................19
9、Detailed Description Of Function pins.................................................................20
10、Dimensions ...........................................................................................................21
11、LAYOUT
Precautions.....................................................................................21
12、AT COMMAND...................................................................................................22
12.1 Test Command .........................................................................................................23
12.2 Get The Software Version…………….....................................................................23
12.3 Query Module Bluetooth MAC……........................................................................23
12.4 Set/Query Device Name...........................................................................................23
12.5 Set/Query - Serial Port Baud Rate............................................................................24
12.6 Set/Query - Serial Port Stop Bit................................................................................25
12.7 Set / Query - Serial Parity Bit…………....................................................................25
12.8 Set/Query-Notify the host computer connection status (only slave mode is valid)25
12.9 Set/Query - Notification connection with address code(only slave mode is valid).25
12.10 Settings\Query - SERVICE UUID.........................................................................26
12.11 Settings\Query - NOTIFY UUID\ WRITE UUID ................................................26
12.12 Settings\Query - WRITE UUID ............................................................................26
12.13 Settings\Query - Wait for the channel to be established after connecting(only
slave module is valid)........................................................................................................27
12.14 Settings\Query - Low Power Mode(only slave module is valid)..........................27
12.15 Settings\Query - Broadcast time interval(only slave module is valid)……............27
12.16Settings\Query - Module transmit power(only slave module is valid)……............28
12.17 Software restart……………………………………………………………….…..28
12.18 Restore default settings………………………………………………………..…28
12.19 Query - Master Mode(only master module is valid)..............................................28
12.20 Search for Bluetooth devices (only master module is valid) ................................28
12.21 Print search to device list(only master module is valid).........................................29
12.22 Settings\Query—Automatically search for Bluetooth devices (master module is
valid) ...............................................................................................................................29
12.23 Connect a Bluetooth device (only master module is valid)………………...........29
12.24 Settings\Query—Automatically connect to Bluetooth device…………..……....29
12.25 Connect to the remote specified address Bluetooth (only master mode is valid).30
12.26 Bind the specified address to Bluetooth (only master module is valid)….……. 30
12.27 Clear connection memory(only master module is valid)…………………………30
13、Contact Us.............................................................................................................30

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1．Overview
2．Module default parameters ：
Bluetooth Protocol
Bluetooth Specification V4.0 BLE
Working Frequency
2.4GHz ISM band
Communication Interface
UART
Power Supply
3.3V
Communication distance
30-40M (Open and unobstructed environment)
Physical Dimension
18.5(L)mm x 13.5(W)mm x 2(H) mm
Bluetooth Authentication
FCC CE ROHS REACH
Bluetooth Name
BT19
Serial Port Parameters
9600、8 data bits、1 stop bit、No check、No flow control
Service UUID
FFE0
Notify\Write UUID
FFE1
Write UUID
FFE2
Storage temperature
MIN:-55℃- MAX:+125℃
Work temperature
MIN:-20℃- MAX:+70℃
Customized requirements
If you have other special function requirements, you
can contact us to customize the module.
DX-BT19 4.0 Bluetooth module is built by Shenzhen
DX-SMART Technology Co., Ltd. for intelligent wireless data
transmission. It adopts CC2541 chip of American TI Company,
configures 256Kb space, and follows V4.0 BLE Bluetooth
specification. Support AT command, users can change the serial
port baud rate, device name, pairing password and other
parameters as needed, flexible use.
This module supports UART interface and supports
Bluetooth serial port transparent transmission. It has the
advantages of low cost, small size, low power consumption, high
sensitivity of sending and receiving, etc. It can realize its
powerful functions with only a few peripheral components simple
operation, high cost performance and technology leading edge.

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3．Application area:
DX-BT19 module supports BT4 .0 BLE protocol, which can be directly connected to iOS
devices that have BLE Bluetooth function, and supports background program resident operation.
Successful application of BT19 module:
※Bluetooth wireless data transmission；
※Mobile phones, computer peripherals；
※Handheld POS device；
※Medical equipment wireless data transmission；
※Smart Home Control；
※Automotive Inspection OBD Equipment；
※Bluetooth printer;
※Bluetooth remote control toy;
※Anti-lost device, LED light control;
4．Power consumption parameters:
Mode
Status
Current
Unit
Low power mode
Discoverable
400-700
uA
Connected
8.5
mA
Normal working mode
Discoverable
8.5
mA
Connected
8.5
mA
5．Radio frequency characteristics:
6．Transparent transmission parameters
Data throughput:
Rating
Value
Unit
BLE Transmit power
0
dBm
BLE Sensitivity
-93
dBm
Android ->BT19 -> UART
UART ->BT19 -> Android
Baud rate
115200
Baud rate
115200
Connection interval (ms)
20
Connection interval (ms)
20
Serial packet size (bytes)
200
Serial packet size (bytes)
200

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Note: This table parameter is for reference only and does not represent the maximum data
throughput that the module can support.
7. Module pin description and minimum circuit diagram:
8．Pin function description:
Pin number
Pin name
Pin description
1
UART_RTS
NC
Transmission interval (ms)
70
Transmission interval (ms)
70
Throughput (bytes/s)
2500
Throughput (bytes/s)
2800
Characteristic Write
Write without
Response
Characteristic Notify
Notify
iPhone 6 ->BT19 -> UART
UART ->BT19 -> iPhone 6
Baud rate
115200
Baud rate
115200
Connection interval (ms)
30
Connection interval (ms)
30
Serial packet size (bytes)
100
Serial packet size (bytes)
200
Transmission interval (ms)
50
Transmission interval (ms)
120
Throughput (bytes/s)
2000
Throughput (bytes/s)
1800
Characteristic Write
Write without
Response
Characteristic Notify
Notify

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2
UART_TX
Serial data output
3
UART_CTS
NC
4
UART_RX
Serial data input
5
P2_1
Debug data port
6
P2_2
Debug clock port
7
SCL
Clock port
8
SDA
Data port
9
VCC
3.3 V
10
NC
NC
11
RESETB
Low level reset, at least 5ms
12
GND
Land
13
P1_1
Bluetooth connection indicator (not connected low,
connection high)
14
P1_0
Programmable input and output port
15
P1_2
LED light pin
16
P1_3
SW1 system button,
9．Detailed description of function pins:
1. P15 pin (P1_2): LED indicator pin
·Used to indicate the status of the Bluetooth module. Correspondence between the LED
flashing mode and the Bluetooth module status is shown in the following table:
Mode
LED Display
Module Status
Slave module
Uniformly slow flashing (800ms-on, 800ms-off)
standby mode
Long bright
Connection Status
Main module
Evenly flashing (300ms-on,300ms-off)
Search and connect
Long bright
Connection Status
2. P13 pin (P1_1): connection status indicator
Pin state
Module status
Output low level
standby mode
Output high level
Connection Status
3. P16 pin (P1_3): connection interrupt pin (module is in the connected state)
Pin state
Module status
No action
Connection Status

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Input 200ms low pulse
Interrupt connection, module enters
standby
10．Dimensions:
11．LAYOUT Precautions:
The DX-BT19 Bluetooth module works in the 2.4G wireless band. It should try to avoid the
influence of various factors on the wireless transceiver. Pay attention to the following points:
1. the product shell surrounding the Bluetooth module to avoid the use of metal, when using
part of the metal shell, should try to make the module antenna part away from the metal part.
2. The internal metal connecting wires or metal screws of the product should be far away
from the antenna part of the module.
3. The antenna part of the module should be placed around the PCB of the carrier board. It is
not allowed to be placed in the board, and the carrier board under the antenna is slotted. The
direction parallel to the antenna is not allowed to be copper or traced. It is also a good choice to
directly expose the antenna part out of the carrier board.
4. It is recommended to use insulating material for isolation at the module mounting position
on the substrate. For example, put a block of screen printing (TopOverLay) at this position.

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12. AT COMMAND
(Note: AT command mode when the module is not connected)
1. AT command, which belongs to the character line instruction, is parsed according to the line
(that is,AT command must be returned by carriage return or \r\n, hexadecimal number is 0D0A)
2. The AT command supports case and the instruction prefix is AT+, which can be divided into
parameter setting instructions and read instructions.
3. Set the instruction format: AT+<CMD><PARAM> Operation returns successfully:
+<CMD>=<PARAM>\r\n OK\r\n Failure does not return characters.
4. Read instruction format: AT+<CMD>Operation succeeds: +<CMD>=<PARAM>\r\n
Failure does not return a return character.
AT command format example (Figure 1 is AT test command, Figure 2 is to change the Bluetooth
name to 1234):

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1、Test Command:
Function
Command
Response
Description
Test instructions
AT \r\n
OK\r\n
2、Get The Software Version:
Function
Command
Response
Description
Query version number
AT+VERSION\r\n
+VERSION=<version>\r\n
OK\r\n
<version > Software
version number
Note:The version will be different depending on different modules and customization
requirements.
3、Set/Query Module Bluetooth MAC:
Function
Command
Response
Description
Query module MAC
address
AT+LADDR\r\n
+LADDR=<laddr>\r\n
<laddr> Bluetooth 12-bit
MAC Address Code
4、Set/Query Device Name:

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Function
Command
Response
Description
Query module Bluetooth
name
AT+NAME\r\n
+NAME=<name>\r\n
<name> Bluetooth
name, up to 18 bytes
Default name: BT19
Set the module
Bluetooth name
AT+NAME<name
>\r\n
+NAME=<name>\r\n
OK
Example:
1. Send Settings:
AT+NAME=DX-BT19\r\n ——Set module device name：“DX-BT19”
return：
+NAME=DX-BT19\r\n ——Set module device name：“DX-BT19” successed
OK\r\n
2. Send inquiry：
AT+NAME\r\n ——Query module name
return：
+NAME=DX-BT19\r\n ——Return module device name：“DX-BT19”
5、Set/Query - Serial Port Baud Rate:
Function
Command
Response
Description
Query module baud
AT+BAUD\r\n
+BAUD=<baud>\r\n
<baud> Baud rate
corresponding serial
number
1:1200
2:2400
3:4800
4:9600
5:19200
6:38400
7:57600
8:115200
Default：4 (9600)
Set the module baud
AT+BAUD<bau
d>\r\n
+BAUD=<baud>\r\n
OK\r\n
Note: The module must be re-powered after setting the baud rate, enabling the new baud rate
for data communication andAT command resolution.
Example: Setting the Serial Port Baud Rate: 38400
1. Send Settings:
AT+BAUD6 \r\n
return：