RAYTAC MDBT42T-AT-UART-S User manual

Version: B
Issued Date: 2020/11/27
User Guide
(簡易使用手冊)
產品名稱 (Product): Demo Board for MDBT42T-AT / PAT
產品型號 (Model No.): MDBT42T – AT – UART – S
韌體版本 (FW Revision): 1.0

Index
1. Introduction ................................................................................................................... 3
1.1. Contents of the Set ............................................................................................... 3
2. Hardware Description ................................................................................................... 4
3. Reference Circuit........................................................................................................... 6
4. AT Command ................................................................................................................. 7
4.1. List of supported commands................................................................................. 7
4.2. AT Command Sets................................................................................................ 8
4.3. Default Info ......................................................................................................... 14
5. How to Control via External MCU .............................................................................. 15
5.1. How to Send AT Commands............................................................................... 15
5.2. How to Transmit Data ......................................................................................... 16
5.3. How to Return to Flashed Default Setting........................................................... 16
6. Test Report................................................................................................................... 17
6.1. Current Test ........................................................................................................ 17
6.2. Throughput Test.................................................................................................. 18
7. Useful Links ................................................................................................................. 20
History of Firmware Revision............................................................................................ 21
Release Note....................................................................................................................... 22

1.Introduction
This document shows how to use the demo board (MDBT42T-AT-UART-S) to test function of
MDBT42T-AT & MDBT42T-PAT.
MDBT42T-AT-UART-S is designed for testing and debugging without building your own
board. The board is only available with MDBT42T-AT (chip antenna) module. MDBT42T-AT
will be pre-programmed with Raytac’s AT command firmware. If you don’t need such pre-
programming and is looking for nRF52805 module, please check MDBT42T-192K &
MDBT42T-P192K.
Please visit our website for spec sheet of every module mentioned above.
1.1. Contents of the Set
Each set includes MDBT42T-AT-UART-S x 1 and mini-USB cable x 1. Please contact us if
the set you receive is not complete.

2.Hardware Description
(1) MDBT42T-AT BLE module based on nRF52805.
(2) 32.768KHz crystal for external LF.
(3) 10uH & 15nH inductor for DC-to-DC mode.
(4) Interface to connect to external MCU.
(5) ADC input for battery detection only. Reference voltage is 0.6V.
Example:
formula: Input Voltage  
  
   
       

(6) UART interface for data bridge or AT commands.
(7) Wake-up key.
(8) Debug interface, connecting to Nordic’s nRF5X DK.
Important: Please be careful not to “erase” the module during testing. Raytac’s
AT command firmware will not be shared. You may need to send the unit to us
for re-programming when module’s FW is erased.
(9) 3.3V LDO to power up MDBT42T-AT.
(10) LED for status indicator
(11) USB Power only

3.Reference Circuit

4.AT Command
4.1. List of supported commands
- Setting of device name
-Choose data rate of 1Mbps or 2Mbps on-air
-Set TX output power in 5 levels.
-Set advertising time
-Set connection interval under Mode 2
-Enable/disable advertising
-7 sets of UART baud rates
-Enable/disable UART flow control
-Enable/disable interface of UART hardware
-Power-down mode for power saving and GPIO wake-up
-Support DC-to-DC and LDO power mode
-Use internal or external 32.768KHz oscillator
-Recover-to-default setting with hardware and software method
-System reset of hardware and software
-Set serial number and retrieve
-Set or retrieve MAC Address
-Retrieve ADC value for battery detection, delivering the information through battery
service.
-Support maximum MTU 247bytes / data payload up to maximum 244 bytes

4.2. AT Command Sets
4.2.1.“Write”Commands
No.
Command
Description
(1)
AT+NAME
Set device name,Max. length of 20 characters
e.g. AT+NAME123 (device name 123, 3 characters)
(2)
AT+RESET
Set to reset system
(3)
AT+ADVSTART
Set to start advertising
(4)
AT+ADVSTOP
Set to stop advertising
(5)
AT+SLEEP
Set to get into deep sleep mode
(6)
AT+BAUDRATE9600
Set UART baud rate at 9600 bps,n,8,1
(7)
AT+BAUDRATE19200
Set UART baud rate at 19200 bps,n,8,1
(8)
AT+BAUDRATE38400
Set UART baud rate at 38400 bps,n,8,1
(9)
AT+BAUDRATE57600
Set UART baud rate at 57600 bps,n,8,1
(10)
AT+BAUDRATE115200
Set UART baud rate at 115200 bps,n,8,1
(11)
AT+BAUDRATE230400
Set UART baud rate at 230400 bps,n,8,1
(recommended enabling flow control)
(12)
AT+BAUDRATE460800
Set UART baud rate at 460800 bps,n,8,1
(recommended enabling flow control)
(13)
AT+FLOWCONTROLDIS
Disable UART flow control
(14)
AT+FLOWCONTROLEN
Enable UART flow control
(15)
AT+TXPOWER4DBM
Set RF TX power at + 4dBm
(16)
AT+TXPOWER0DBM
Set RF TX power at 0dBm
(17)
AT+TXPOWER-4DBM
Set RF TX power at - 4dBm
(18)
AT+TXPOWER-8DBM
Set RF TX power at - 8dBm
(19)
AT+TXPOWER-20DBM
Set RF TX power to - 20dBm
(20)
AT+XTALINTERNAL
Use internal RC 32.768KHZ low frequency oscillator
(21)
AT+XTALEXTERNAL
Use external crystal 32.768KHZ low frequency oscillator
(22)
AT+CONNECTINDICATORLOW
Set logic low output when connecting BT
(23)
AT+CONNECTINDICATORHIGH
Set logic high output when connecting BT
(24)
AT+PHYMODE1MBPS
Set PHY mode at 1Mbps

No.
Command
Description
(25)
AT+PHYMODE2MBPS
Set PHY mode at 2Mbps
(26)
AT+WAKEUPLOW
Set logic low at wake-up when in deep sleep
(27)
AT+WAKEUPHIGH
Set logic high at wake-up when in deep sleep
(28)
AT+ADVTIMEtttt
Set advertising time (Hex)
e.g. 0x001E (min. 30secs),
0x0E10 (Max. 3,600secs)
0x0000 (forever)
(29)
AT+DCDCDIS
Disable DC to DC converter
(30)
AT+DCDCEN
Enable DC to DC converter
(31)
AT+CONNECTINTERVALMODE0
Set connection interval mode for iOS/Android APP usage
(min. 20ms / Max. 40ms),
(32)
AT+CONNECTINTERVALMODE1
Set connection interval mode for nRF52832 Central usage
(min. 8ms / Max. 8ms)
(33)
AT+CONNECTINTERVALMODE2
Set connection interval mode for iOS/Android APP usage
(programmable: min. / Max. range is 8ms ~ 1,000ms)
(34)
AT+CONNECTINTERVALTIMEtttttttt
Set connection interval time (Hex), available when
activating “AT+CONNECTINTERVALMODE2”
e.g. 0x0008 (8ms),
0x03E8 (1,000ms), conditions to be met:
“min. connection interval ≦ Max. connection interval”

No.
Command
Description
(35)
AT+SERIALNOnnnnnnnn
Set serial number
e.g. AB000001, fixed 8-character length
(36)
AT+RESPONSEDIS
Disable response when sending “write” command
(37)
AT+RESPONSEEN
Enable response when sending “write” command
(38)
AT+DISCONNECT
Terminate the connection
(39)
AT+DEFAULT
Back to default
(40)
AT+MACADDRnnnnnnnnnnnn
Set IC MAC address, where n is Hex.
Written order is from MSB byte to LSB byte.
*** Important ***
Flow control function cannot be activated when use external 32.768 Khz crystal
oscillator. A “fail” response will return.
Status of Flow Control
Disable
Enable
Internal RC oscillator


External crystal oscillator

fail