Ezurio TDK-BTISM Bluetooth Intelligent Serial Module User Manual AT Command Set

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Document Author:	Mahendra.Tailor

Bluetooth Serial Module
AT Command Set
Doc No:
Date :
Author :
XRBLU020-001SW-0
3 Feb 2003
Mahendra Tailor
Issue No : 1.9
Page 1 of 38
Bluetooth Serial Module
AT Command Set
Prepared by :
Mahendra Tailor
Signature :
Authorised by:
Signature :
© 2003 COPYRIGHT TDK Systems Europe Ltd
This document is issued by TDK Systems Europe Limited (hereinafter called TDK) in confidence, and is
not to be reproduced in whole or in part without the prior written permission of TDK. The information
contained herein is the property of TDK and is to be used only for the purpose for which it is submitted and
is not to be released in whole or in part without the prior written permission of TDK.
©
TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 2 of 38
Change History
Issue
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
Description
First Draft
*) Added S registers 504,530,531
*) Added commands AT+BTR & AT+BTA
*) Audio capability
*) Added Chapter “Asynchronous Responses”
*) Added S Registers 533 and 534
*) Updated Pin Designation on 40 way connector
*) Added S Register 535
*) Error in AT Command sequence in the pure cable replacement chapter corrected
*) Removed paragraph regarding unilateral acceptance of incoming call – not an issue
anymore
*)Added the “Frequently Asked Questions” Chapter
*)Added NickH’s comments
*) Updated the “pure cable replacement” chapter
*) Added the AT&F* command for completely erasing the nvram
*) AT+BTI now returns ERROR 27 if S Reg 518 is set too high
*) ERROR 17,18 and 19 no longer reported
*) New Asynchronous response => PAIR n 
*) Version = 0.3.6
*) S Reg 533 now takes value 0 to 2 inclusive
*) Added S Reg 525
*) Added the Motherboard Chapter
*)Corrected details for SReg 508 to 511 inclusive
*)AT&F command modified
*)Added Power Consumption Chapter
© TDK Systems Europe Ltd 2003
Author
M Tailor
M Tailor
Date
4-Oct-2002
16-Oct-02
M Tailor
M Tailor
M Tailor
M Tailor
31-Oct-02
1 Nov 02
12 Nov 02
6 Dec 02
M Tailor
9 Dec 02
M Tailor
2 Jan 03
M Tailor
M Tailor
14 Jan 03
3 Feb 03
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 3 of 38
Contents
1.
Introduction
2.
AT Command Set
2.1 Assumptions ....................................................................................................................................6
2.2 Commands ......................................................................................................................................6
2.2.1
AT................................................................................................................................6
2.2.2
ATZ
{Hardware Reset}.........................................................................................6
2.2.3
ATEn
{Enable/Disble Echoes} .............................................................................7
2.2.4
AT&Fn
{Set S Reg Defaults}................................................................................7
2.2.4
AT&F*
{Clear NonVolatile Storage} ....................................................................7
2.2.5
AT&W
{Write S Regs to Non-Volatile Memory} ...................................................7
2.2.6
ATIn
{Information} ................................................................................................8
2.2.7
ATSn=m
{Set S Register} ....................................................................................9
2.2.6
Future S Registers ......................................................................................................10
2.2.8
ATSn?
{Query S Register}...................................................................................11
2.2.9
ATD
{Make Connection}.....................................................................11
2.2.10
ATDU
{Make Authenticated Connection}...........................................11
2.2.11
ATDY
{Make Encrypted Connection} .................................................11
2.2.12
ATDUY
{Make Encrypted/Authenticated Connection} .......................11
2.2.13
ATDYU
{Make Encrypted/Authenticated Connection} .......................11
2.2.14
+++
{Enter Command Mode} ................................................................................11
2.2.15
^^^
{Enter Command Mode} .................................................................................12
2.2.16
ATA
{Answer Call} ...............................................................................................12
2.2.17
ATH
{Drop Connection} .......................................................................................12
2.2.18
ATO
{Enter Online Mode} (letter ‘o’) ...................................................................12
2.2.19
AT+BTO
{Open and make Unit Detectable} .....................................12
2.2.20
AT+BTI
{Inquire} .................................................................................12
2.2.21
AT+BTIV
{Inquire} ..............................................................................13
2.2.22
AT+BTIN
{Inquire} ..............................................................................13
2.2.23
AT+BTX
{Disable Page/Inquiry Scanning} ..........................................................13
2.2.24
AT+BTQ
{Enable Inquiry Scans ONLY} ..............................................................13
2.2.25
AT+BTG
{Enable Promiscuous Page Scanning ONLY}......................................13
2.2.26
AT+BTGU
{Enable Promiscuous Page Scanning ONLY} ...................................13
2.2.27
AT+BTGY
{Enable Promiscuous Page Scanning ONLY} ...................................14
2.2.28
AT+BTGUY
{Enable Promiscuous Page Scanning ONLY}.................................14
2.2.29
AT+BTGYU
{Enable Promiscuous Page Scanning ONLY}.................................14
2.2.30
AT+BTG
{Enable Cautious Page Scanning ONLY}...........................14
2.2.31
AT+BTP
{Enable Promiscuous Page Scaning + Inquiry Scans} .........................14
2.2.32
AT+BTPU
{Enable Promiscuous Page Scaning + Inquiry Scans} ......................14
2.2.33
AT+BTPY
{Enable Promiscuous Page Scaning + Inquiry Scans}.......................15
2.2.34
AT+BTPUY
{Enable Promiscuous Page Scaning + Inquiry Scans} .....................15
2.2.35
AT+BTPYU
{Enable Promiscuous Page Scaning + Inquiry Scans} ....................15
2.2.36
AT+BTP
{Enable Cautious Page Scanning + Inq Scans}..................15
2.2.37
AT+BTN=
{Set Friendly Name in NonVol Mem}.....................................15
2.2.38
AT+BTN?
{Read Friendly Name from NonVol Mem} ..........................................15
2.2.39
AT+BTF=
{Set Friendly Name}...............................................................15
2.2.40
AT+BTS=
{Set Service Name} ...............................................................16
2.2.41
AT+BTS?
{Read Service Name from NonVol Mem} ...........................................16
2.2.42
AT+BTW {Initiate pairing}.......................................................................16
2.2.43
AT+BTK=
{Set Passkey}..........................................................................16
2.2.44
AT+BTT
{Add Trusted Device} ............................................................................16
2.2.45
AT+BTT?
{List Trusted Devices} .........................................................................17
2.2.46
AT+BTW?
{List Cached Trusted Device} ............................................................17
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
2.2.47
2.2.48
2.2.50
2.2.49
2.2.51
Issue No :
1.9
Doc No :
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Page 4 of 38
AT+BTD {Remove Trusted Device} ......................................................17
AT+BTD* {Remove All Trusted Device} .................................................................17
AT+BTR {Set Peer Address}.................................................................17
AT+BTR?
{Display Peer Address}.......................................................................18
AT+BTAn
{Control Audio Channel} .....................................................................18
3.
Unsolicited Responses
19
3.1 RING................................................................................................................................................19
3.2 PIN?.................................................................................................................................................19
3.3 AUDIO ON.......................................................................................................................................19
3.4 AUDIO OFF .....................................................................................................................................19
3.5 AUDIO FAIL.....................................................................................................................................19
3.6 ERROR 27.......................................................................................................................................19
3.7 PAIR n ...........................................................................................................................19
4.
Incoming Connections
20
5.
Dropping Connections
21
6.
Pairing and Trusted Devices
22
7.
Error Responses
23
8.
Pin Out
24
9.
RS232 Signal Pin Mapping
25
10.
Power Consumption and Reset
26
10.1
Reset .....................................................................................................................................26
10.2
Power Consumption..............................................................................................................26
11
Pure Cable Replacement Mode
28
11.1
Data Cable ............................................................................................................................28
11.2
Audio Cable...........................................................................................................................29
12.
Frequently Asked Questions
30
13.
Development Motherboard
32
14.
Use Cases
35
14.1
Example 1: Light Switch Controller .......................................................................................35
14.1.1
Background.................................................................................................................35
14.1.2
AT Command Sequence ............................................................................................35
14.2
Example 2: Remote Data Logger..........................................................................................36
14.2.1
Background.................................................................................................................36
14.2.2
AT Command Sequence ............................................................................................36
14.3
Example 3: Trusted Device Management.............................................................................37
14.3.1
Background.................................................................................................................37
14.3.2
Obtain a new Link Key ................................................................................................37
14.3.3
Store link key in trusted device database ...................................................................37
14.3.4
List trusted device database .......................................................................................37
14.3.5
Store link key in trusted device database (full) ...........................................................38
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
1.
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 5 of 38
Introduction
This document describes the protocol used to control and configure TDK’s Bluetooth Serial Module. The
protocol is similar to the industry standard Hayes AT protocol used in telephony modems due to the fact
that both types of devices are connection oriented. Appropriate AT commands have been provided to
make the module perform the two core actions of a Bluetooth device, which is make/break connections
and Inquiry. Many other AT commands are also provided to perform ancillary functions, such as, pairing,
trusted devices database management, S Register maintenance etc.
Just like telephony modems, the serial module powers up into an unconnected state and will only respond
via the serial interface. In this state the module will not even respond to Bluetooth Inquiries. Then, just like
controlling a modem, the host can issue AT commands which map to various Bluetooth activities. The
command set is extensive enough to allow a host to make connections which are authenticated and/or
encrypted or have neither.
The device has a serial interface which can be configuration for baudrates from 1200 up to 921600, and
an RF communications end point. The latter has a concept of connected and unconnected modes and the
former will have a concept of Command and Online mode. This leads to a 2x2 matrix of four states, as
shown below.
Command Mode
Online Mode
RF Unconnected
OK
ILLEGAL
RF Connected
OK
OK
One combination, ‘RF unconnected’ and ‘Online Mode’ does not make sense and will be ignored.
Navigation between these states is done using the AT commands which are described in detail in
subsequent sections.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
2.
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 6 of 38
AT Command Set
2.1
Assumptions
The CSR (Cambridge Silicon Radio) BC2 chipset in the TDK Modules is memory resource limited
therefore it is NOT proposed that there be full implementation of the AT protocol as seen in modems. The
claim made for this device is that it will have a protocol similar to an AT modem. In fact, the protocol is
similar enough so that existing source code written for modems, can be used with very little modification
for use with this serial module.
Therefore the following assumptions are made:1
2.2
All commands will be terminated by the carriage return character 0x0D, which is represented by
the string  in descriptions below and cannot be changed.
All responses from the module will have carriage return and linefeed characters prepending and
appending the response. These dual character sequences have the values 0x0D and 0x0A
respectively and shall be represented by the string  and cannot be changed.
All Bluetooth addresses shall be represented by a fixed 12 digit hexadecimal string, case
insensitive.
All Bluetooth Device Class codes shall be represented by a fixed 6 digit hexadecimal string, case
insensitive.
All new Bluetooth specific commands shall be identified by the string +BTx, where x is generally a
mnemonic of the intended functionality.
Commands
This section describes all available AT commands. Many commands require mandatory parameters and
some take optional parameters. These parameters are either integer values,strings,Bluetooth addresses
or device classes. The following convention is used when describing the various AT commands
 A 12 character Bluetooth address consisting of ascii characters ‘0’ to ‘9’, ‘A’ to ‘F’ and ‘a’ to ‘f’.
 A 6 character Bluetooth device class consisting of ascii characters ‘0’ to ‘9’, ‘A’ to ‘F’ and ‘a’ to
‘f’.
A positive integer value
An integer value which could be positive or negative, which can be entered as a decimal value
or in hexadecimal if preceded by the ‘$’ character. Eg the value 1234 can also be entered as
$4D2

A string delimited by double quotes. Eg “Hello World”. The “ character MUST be supplied as
delimiters.
2.2.1 AT
Response:
2.2.2 ATZ
OK
{Hardware Reset}
Forces the device through a hardware reset which means it will eventually come alive in the Command
mode and Bluetooth Unconnected mode. This allows changes to the PS store to take effect. Allow for
about 2 seconds for the device to start responding to AT commands again. The surest way of determining
that the device is alive again, is to keep sending it AT until it responds with an OK response.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Response:
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 7 of 38
OK note OK is returned before the RESET
2.2.3 ATEn
{Enable/Disble Echoes}
It affects S Register 506. Set n=0 to disable echoes and n=1 to enable. All other values will generate an
error.
Response:
OK
2.2.4 AT&Fn
{Set S Reg Defaults}
This command will only work when the device is in idle mode. Depending on the value of ‘n’ it installs S
Reg values appropriate for various power modes, ranging from minimum power consumption to maximum.
Legal values of ‘n’ are as per the following table. All other values of n will generate a syntax error
response.
‘n’
0 (Default)
Description
Medium power consumption, UART baudrate unchanged, Left LED off, Right Led = DCD
Minimum power consumption, UART baudrate set to 9600, Both LEDs off
Minimum power consumption, UART baudrate set to 38400, Both LEDs off
Minimum power consumption, UART baudrate set to 115200, Both LEDs off
Medium power consumption, UART baudrate set to 115200, Left LED off, Right Led = DCD
Maximum power consumption, UART baudrate set to 115200,
Left LED=DSR, Right Led = DCD
Maximum power consumption, UART baudrate set to 460800,
Left LED=DSR, Right Led = DCD
If ‘n’ is not specified then a default value of 0 is assumed where the baudrate is NOT changed.
Please refer to the “Power Consumption” chapter further on, for a more detailed discussion of power
usage.
The new values are NOT updated in nvram until the AT&W command is sent to the module
Response:
Or
Response:
OK
ERROR nn
2.2.4 AT&F*
{Clear NonVolatile Storage}
This command will only work when the device is in idle mode. It installs values in S registers as per
command AT&F4 and then all other user parameters in non-volatile storage is erased. This means that the
trusted device database is cleared, and so are parameters related to the following commands:- AT+BTR,
AT+BTN, AT+BTS.
Response:
Or
Response:
OK
ERROR nn
2.2.5 AT&W
{Write S Regs to Non-Volatile Memory}
Writes current S Register values to non-volatile memory so that they are retained over a power cycle. This
command only works if not in ONLINE_COMMAND mode. This is due to the fact that writing to non-volatile
storage is not allowed while a Bluetooth connection is active.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Response:
Or
Response:
2.2.6 ATIn
Issue No :
1.9
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Page 8 of 38
OK
ERROR nn
{Information}
This will return information about the module. For example, version numbers, manufacturer etc
For n=0, the response describes the product.
Response:
TDK Serial ModuleOK
For n=1, the CSR firmware build number is returned, for example
Response:
520OK
For n=2, the TDK Image number is returned, for example
Response:
06GOK
A letter suffix implies an engineering build for internal use.
For n=3, the version number of the vm app is returned, for example
Response:
1.01OK
For n=4, a 12 digit hex number corresponding to the Bluetooth address of the device is returned
Response:
aabbccddeeOK
For n=5, the Manufacturer of this device is returned
Response:
TDK Systems Europe Ltd, UKOK
For n=6, the maximum size of trusted device database is returned
Response:
4OK
For n=7, the manufacturer of the Bluetooth chipset is returned
Response:
CSROK
For n=8, the chipset designation is returned
Response:
BC2-EXTOK
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
2.2.7 ATSn=m
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 9 of 38
{Set S Register}
There is a concept of registers which are used to store parameters, such as escape sequence character,
inquiry delay time etc, as listed in detail below.
The value part ‘m’ can be entered as decimal or hexadecimal. A hexadecimal value is specified via a ‘$’
leading character. For example $1234 is a hex number.
When S register values are changed, the changes are not stored in non-volatile storage UNTIL the AT&W
command is used. Note that AT&W does not affect S registers 520 to 525, 1000 to 1010 as they are
updated in non-volatile storage when the command is received.
Register
‘n’
Default
Range
Comment
-1..15
‘^’
0..255
12
500
501
502
503
504
505
100
50..5000
0..1
0..1
0..1
0..1
0..1
2 .. 120
506
507
0..1
0..2
508
509
510
511
512
640
320
640
320
10..2550
10..2550
10..2550
10..2550
0..4
513
514
515
10
0x000000
0..1
1..60
0.. 0xFFFFFF
516
0xFFFFFF
0.. 0xFFFFFF
517
518
20
2 .. 61
0..255
519
500
100.. 6000
520
115200
300.. 921600
Number of RING indication before auto answering an inbound connection. A value of 0
disables autoanswer. If -1, then autoanswer on one RING and do NOT send
RING/CONNECT response to the host. This emulates a serial cable replacement
situation.
Escape sequence character. It is not ‘+’ by default as a Bluetooth serial link can be used
to connect to a mobile phone which exposes an AT command set, which will in turn use
‘+’ as default. So if both used ‘+’ there will be confusion
Escape sequence guard time in milliseconds.
Default Authentication for outgoing connections, Set to 1 to Enable Authentication
Default Encryption for outgoing connections, Set to 1 to Enable Encryption
Default Authentication for incoming connections, Set to 1 to Enable Authentication
Default Encryption for incoming connections, Set to 1 to Enable Encryption
Set to 1 for suppression of CONNECT message to host for outbound connections
Delay before abandoning connection attempt as a master. Referenced by the ATD. In
units of seconds
Enable/Disable echoes. The ATEn command also affects this.
When set to 0, a connection can be dropped using ^^^ escape sequence only and the
state of DSR line is ignored. When set to 1 a connection can be droped using EITHER the
^^^ escape sequence OR the DSR handshaking line. Finally when set to 2, a connection
can only dropped using a deassertion of DSR. Mode 2 provides for the highest data
transfer rate.
Page Scan Interval in units millisec ( 10ms will give 11.25ms)
Page Scan Window in units millisec ( 10ms will give 11.25ms)
Inquiry Scan Interval in units of millisec ( 10ms will give 11.25ms)
Inquiry Scan Window in units of millisec ( 10ms will give 11.25ms)
Specify power up state. If set to 0 then AT+BTO is required to open the device for
Bluetooth activity. When set to 1, it proceeds to a state as if AT+BTO was entered. When
set to 2, it will scan for inquiries only, similar to issuing AT+BTQ. When set to 3, it will
page for a connection but not be discoverable eg AT+BTG and finally when set to 4, it will
be like AT+BTP. Note that by implication, a change to this can only be seen after a power
cycle AND if AT&W is actioned prior to the power cycle.
Pairing Authentication , 1 = Enable
Pairing Timeout in seconds
Default Device Class Code to be used with AT+BTO when it is not explicitly specified.
When queried, the value is always printed as a hex number.
Default Device Class Code to be used with AT+BTI when it is not explicitly specified.
When queried the value is always printed as a hex number.
Inquiry Length in units of seconds. This parameter is referenced by the AT+BTI command
Maximum number of responses from an inquiry request . This parameter is reference by
the AT+BTI command. If this number is set too high, then AT+BTI will return ERROR 27.
For a particular firmware revision, determine the effective maximum value by trial and
error. That is, set to a high value, send AT+BTI and if ERROR 27 is returned, then retry
with a smaller value. This effective max value will remain unchanged for that particular
firmware build.
When S507>0, and in a connection, DSR can be used to change from online to command
state by deasserting the DSR line for less than the time specified in this register. This
value is rounded down to the nearest 100ms
Change baudrate. The effect is immediate and in fact the OK will be sent at the new
baudrate. Due to the integer arithmetic involved, the actual baudrate is different. To
inspect the actual baudrate, do ATS521? ATS520? will return the baudrate to the nearest
100.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
521
115200
300.. 921600
522
523
524
525
See
Comment
1..2
0..2
0..1
530
1000
100.. 15000
531
532
0..1
0..3
533
0..2
534
0..1
535
20
0..41
540
0 48-127
1001 to
1010
610
620
n/a
0..31
0..31
621
622
623
624
625
626
627
628
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
0..1
0..1
0..1
0..1
0..1
1.9
Doc No :
XRBLU020-001SW-0
If Sreg 525=1, then the max baudrate is limited to 115200
Change baudrate. The effect is immediate and in fact the OK will be sent at the new
baudrate. Due to the integer arithmetic involved, the actual baudrate is different. To
inspect the actual baudrate, do ATS521?
If Sreg 525=1, then the max baudrate is limited to 115200
1 = CTS/RTS hardware handshaking enabled
Number of StopBits
Parity. 0=None, 1=Odd, 2=Even
Apply multiplier of 8 to baudrate internally. This is set to 0 (disabled) by default for the
serial module, and set to 1 (enabled) by default for the pc card variant.
It is required in the pc card because the UART chip on the pc card is driven by a
14.7456MHZ crystal instead of 1.8432MHz. This means that when a host asks for a
baudrate, in reality it gets a baudrate which is 8 times faster.
If S Reg 520 > 115200 then this register cannot be set to 1.
Reconnect delay when configured as master in pure-cable-replacement mode. This value
is rounded down to the nearest 100ms
If Set to 1 then on connection, remain in Command Mode.
If non zero then on every connection, and SCO channel (audio) will be initiated. If value
=1 then HV1, if =2 then HV2 and finally if =3 then HV3
If set to 1 then left LED follows RI state, if set to 2 then it follows the state of DSR and if 0
then neither and GPIO5 is available as a user i/o.
This register will not necessarily be effective immediately after changing the value. It must
be saved to non-volatile store using AT&W and will operate as expected after an ATZ or a
power cycle.
If set to 1 then right LED follows DCD state, otherwise GPIO4 is available as user i/o.
This register will not necessarily be effective immediately after changing the value. It must
be saved to non-volatile store using AT&W and will operate as expected after an ATZ or a
power cycle.
Link Supervision Timeout. If units go out of range, then a NO CARRIER message will be
sent to the host after the time specified here
Sets the MTU in L2CAP configuration negotiations. The value of 0 is a special value
which is taken to mean that the current value should remain.
10 General Purpose 32 bit Registers for use by host. These are stored in non-volatile
memory.
Set direction of digital i/o lines
Read/Write to all 8 Digital lines in one atomic step. The value is returned as a 4 digit hex
value wth trailing 0s.
Read/Write to GPIO1
Read/Write to GPIO2
Read/Write to GPIO3
Read/Write to GPIO4
Read/Write to GPIO5
Read/Write to GPIO6 - Not Available so 0 always returned
Read/Write to GPIO7 - Not Available so 0 always returned
Read/Write to GPIO8 - Not Available so 0 always returned
0.. 2^32
2.2.6 Future S Registers
The following registers are planned for the future.
Register
601
602
603
604
Default
n/a
n/a
Response:
Range
TBD
TBD
0..1
0..1
Comment
Read/Write to Analogue Line 1
Read/Write to Analogue Line 2
Set direction of Analogue Line 1
Set direction of Analogue Line 2
OK
If the register is not recognised or the value specified is out of range then
Response:
Page 10 of 38
ERROR nn
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
2.2.8 ATSn?
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 11 of 38
{Query S Register}
This will return the current value of register n.
For recognised values of n
Response:
As Appropriate OK
For unrecognised values of n
Response:
ERROR nn
2.2.9 ATD
{Make Connection}
Make a connection to device with Bluetooth addess . Authentication and Encryption is as per S
registers 500 and 501. The timeout is specified by S register 505
Response:
Or
CONNECT 123456789012
NO CARRIER
2.2.10 ATDU
{Make Authenticated Connection}
Make an authenticated connection to device with Bluetooth addess . Encryption is disabled.
Response:
Or
CONNECT 123456789012 A
NO CARRIER
2.2.11 ATDY
{Make Encrypted Connection}
Make an encrypted connection to device with Bluetooth addess . Authentication is disabled
Response:
Or
CONNECT 123456789012 E
NO CARRIER
2.2.12 ATDUY
{Make Encrypted/Authenticated Connection}
Make an encrypted and authenticated connection to device with Bluetooth addess .
Response:
Or
CONNECT 123456789012 AE
NO CARRIER
2.2.13 ATDYU
{Make Encrypted/Authenticated Connection}
Make an encrypted and authenticated connection to device with Bluetooth addess .
Response:
Or
2.2.14 +++
CONNECT 123456789012 AE
NO CARRIER
{Enter Command Mode}
Usually this is the escape sequence for forcing a modem into command mode when in online state. Since
this device could be used to connect to a mobile phone modem over a Bluetooth serial port profile, it could
confuse matters considerably, therefore the sequence ^^^ is used as described next.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
2.2.15 ^^^
Issue No :
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Page 12 of 38
{Enter Command Mode}
When in online and connected mode, the host can force the device into a command and connected mode
so that AT Commands can be issued to the device. The character in this escape sequence is specified in
the S2 register , so can be changed. In addition, the escape sequence guard time is specified by S
Register 12. By default the guard time is set to 100 milliseconds. Please refer to Section 5: Dropping
Connections for more related information.
Response:
2.2.16 ATA
OK
{Answer Call}
Accept an incoming connection. Which is indicated by the unsolicited string
RING 123456789012 every second. Where 123456789012 is the Bluetooth address of the
connecting device.
Response:
2.2.17 ATH
CONNECT 123456789012
{Drop Connection}
Drop an existing connection or reject an incoming connection indicated by unsolicited RING messages
Response:
2.2.18 ATO
OK
{Enter Online Mode} (letter ‘o’)
Return to online data mode. Assume online after OK is received. Will repond with ERROR if there is no
Bluetooth connection
Response:
OK
or
Response:
ERROR nn
2.2.19 AT+BTO
{Open and make Unit Detectable}
After power up and ATZ, this command is sent so that RFCOMM is initialised and opened and the service
name as specified in AT+BTN is exposed via the SDP registry.
The  value specifies a device class code mask and is a fixed length hex digit optional string. If it
is not specified, then the device class code is taken from S register 515.
For this command to be effective S Register 512 must be set to 0.
2.2.20 AT+BTI
{Inquire}
This will make the device perform an inquiry for device class code cccccc for delay milliseconds and max
number of unique responses, where delay is specified by S register 517 and max is specified by S register
518.
The  value specifies a device class code and is a fixed length hex digit optional string. If it is not
specified, then the device class code is taken from S register 516.  must be exactly 6 hex
characters long.
Response:
12346789012
12345678914
OK
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 13 of 38
ERROR RESPONSE
A Bluetooth inquiry process is such that for a single inquiry request a device could respond many times.
To ensure that an address is sent to the host only once for a particular AT+BTI, an array of addresses is
created at the start of each AT+BTI and is filled as responses come in. This array of addresses is stored in
dynamic memory and as such if the memory allocation fails then the inquiry procedure is aborted and in
that case an error response is sent to the host.
To clarify, a single AT+BTI will never return the same Bluetooth address more than once, but as long as
the responding device is active, all AT+BTI commands will always return it.
Response:
ERROR 27
2.2.21 AT+BTIV
{Inquire}
As per AT+BTI but the response includes the device class code for all inquiry responses. Please refer to
the ‘ERROR RESPONSE’ note in the description for AT+BTI.
Response:
12346789012,123456
12345678914,123456
OK
2.2.22 AT+BTIN
{Inquire}
As per AT+BTI but the response includes the device class code and friendly name for all inquiry
responses. Please refer to the ‘ERROR RESPONSE’ note in the description for AT+BTI.
Response:
12346789012,123456,”TDK AT DONGLE 1”
12345678914,123456,”TDK AT DON7GLE 3”
OK
2.2.23 AT+BTX
{Disable Page/Inquiry Scanning}
Disable page/inquiry scanning. This means it will not accept incoming connections or inquiry requests. In
fact this negates the effect of AT+BTQ, AT+BTG and AT+BTP commands
Response:
OK
2.2.24 AT+BTQ
{Enable Inquiry Scans ONLY}
When inquiry scan is enabled, it implies that this device will respond to inquiries from other devices. Use
AT+BTX to disable inquiries.
Response:
OK
2.2.25 AT+BTG
{Enable Promiscuous Page Scanning ONLY}
Enable page scanning only and wait for a connection from any device. Inquiry scans are disabled
Response:
OK
2.2.26 AT+BTGU
{Enable Promiscuous Page Scanning ONLY}
Enable page scanning only and wait for a connection from any device. Inquiry scans are disabled.
Authentication is enabled and Encryption is disabled.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Response:
Issue No :
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OK
2.2.27 AT+BTGY
{Enable Promiscuous Page Scanning ONLY}
Enable page scanning only and wait for a connection from any device. Inquiry scans disabled
Response:
OK
2.2.28 AT+BTGUY
{Enable Promiscuous Page Scanning ONLY}
Enable page scanning only and wait for a connection from any device. Inquiry scans are disabled.
Authentication is disabled and Encryption is enabled.
Response:
OK
2.2.29 AT+BTGYU
{Enable Promiscuous Page Scanning ONLY}
Enable page scanning only and wait for a connection from any device. Inquiry scans are disabled. Both
Authentication and Encryption is enabled.
Response:
OK
2.2.30 AT+BTG
{Enable Cautious Page Scanning ONLY}
Enable page scanning and wait for a connection from device with Bluetooth address . If the
specified address is 000000000000 then incoming connections are accepted from any device, is as per
AT+BTP without an address. Inquiry Scans are disabled
This command also has variants which allow authentication and encryption to be explicitly specified. For
example:AT+BTGU123456789012
AT+BTGY123456789012
AT+BTGUY123456789012
AT+BTGYU123456789012
Response:
OK
2.2.31 AT+BTP
{Enable Promiscuous Page Scaning + Inquiry Scans}
Enable page scanning and wait for a connection from any device. Inquiry scanning is also enabled.
Authentication and Encyprion is as per defaults in S registers
Response:
OK
2.2.32 AT+BTPU
{Enable Promiscuous Page Scaning + Inquiry Scans}
Enable page scanning and wait for a connection from any device. Inquiry scanning is also enabled.
Authentication is enabled but Encryption is disabled.
Response:
OK
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
2.2.33 AT+BTPY
Issue No :
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Page 15 of 38
{Enable Promiscuous Page Scaning + Inquiry Scans}
Enable page scanning and wait for a connection from any device. Inquiry scanning is also enabled.
Authentication is disabled but Encryption is enabled.
Response:
OK
2.2.34 AT+BTPUY
{Enable Promiscuous Page Scaning + Inquiry Scans}
Enable page scanning and wait for a connection from any device. Inquiry scanning is also enabled.
Both Authentication and Encryption is enabled.
Response:
OK
2.2.35 AT+BTPYU
{Enable Promiscuous Page Scaning + Inquiry Scans}
Enable page scanning and wait for a connection from any device. Inquiry scanning is also enabled.
Both Authentication and Encryption is enabled.
Response:
OK
2.2.36 AT+BTP
{Enable Cautious Page Scanning + Inq Scans}
Enable page scanning and wait for a connection from device with Bluetooth address . If the
specified address is 000000000000 then incoming connections are accepted from any device, is as per
AT+BTP without an address. Inquiry scanning is also enabled.
This command also has variants which allow authentication and encryption to be explicitly specified. For
example:AT+BTPU123456789012
AT+BTPY123456789012
AT+BTPUY123456789012
AT+BTPYU123456789012
Response:
OK
2.2.37 AT+BTN=
{Set Friendly Name in NonVol Mem}
This sets the default friendly name of this device as seen by other devices. It will be stored in a non volatile
storage area. Use AT+BTF to make the name visible to other devices. Use AT+BTN? to read it back
Response:
OK
2.2.38 AT+BTN?
{Read Friendly Name from NonVol Mem}
Reads the default friendly name from non-volatile store.
Response:
”My FriendlyName”
OK
2.2.39 AT+BTF=
{Set Friendly Name}
This sets the friendly name of this device as seen by other devices
Response:
OK
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
2.2.40 AT+BTS=
1.9
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XRBLU020-001SW-0
Page 16 of 38
{Set Service Name}
This writes the name to non-volatile storage area. It will be used after ATZ, power cycle or AT+BTO if it
has not been issued yet. Use AT+BTS? to read it back from non-volatile store.
Response:
OK
If the service name cannot be set for any reason then an error response ERROR 11 is returned.
2.2.41 AT+BTS?
{Read Service Name from NonVol Mem}
Reads the default fservice name from non-volatile store.
Response:
”My ServiceName”
OK
2.2.42 AT+BTW
{Initiate pairing}
This initiates pairing with a device whose Bluetooth address is . An OK response is sent and
when the PIN is required, asynchronous indications will be sent to the host in the form PIN? 
where the address confirms the device with which the pairing is to be performed. To supply a PIN, use the
AT+BTK command detailed next.
For a successful pairing, the link key is stored in a volatile cache which is overwritten everytime a new
pairing is initiated using this command. The link key can be stored in a non-volatile database within the
device. The list of trusted devices is managed using commands AT+BTT?, AT+BTT and AT+BTD. The
AT+BTT? command produces a list of trusted Bluetooth addresses (link key is NEVER displayed) and
AT+BTT is used to store the cached link key. The command AT+BTD123456789012 is used to remove the
specified device from the data base.
The “OK” response is sent immediately on receipt of the AT+BTW command. On pairing completion, an
unsolicited message will be sent to the host which will be in the form PAIR n . See section 3.7
for more details.
Response:
OK
2.2.43 AT+BTK=
{Set Passkey}
This command is used to provide a passkey when PIN? 12345678 indications are received
asynchronously. If a pairing is not in progress then the pin is written to non-volatile store for future use.
Specifying an empty string deletes the key from the non-volatile store.
The string length must be in the range 0 to 8, otherwise an error will be returned.
Response:
OK
2.2.44 AT+BTT
{Add Trusted Device}
This command is used to store the cached link key in the non-volatile database. If the database is full it will
respond with an ERROR. If the device is already in the database, then the key is replaced.
If the link key cache is empty, that is, a pairing has not been performed since the device was powered,
then the response will be an ERROR.
Response:
OK or ERROR
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
2.2.45 AT+BTT?
Issue No :
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Page 17 of 38
{List Trusted Devices}
This command is used to list the contents of the trusted device database. The link key is NOT displayed so
the response is as shown below. If the list is empty then just the OK response is sent otherwise an OK is
used to terminate the list. Use the command ATI6 to read the maximum size of the trusted device
database
Response:
12346789012
12345678913
12345678914
OK
2.2.46 AT+BTW?
{List Cached Trusted Device}
This command is used to list the cached trusted device and the response is as follows.
Response:
12346789012
OK
If the cache is empty the the response is as follows.
Response:
OK
2.2.47 AT+BTD
{Remove Trusted Device}
This command is used to remove the specified device from the list of trusted devices in the non-volatile
database. If the device is not in the database then the response will still be an OK.
Response:
OK
2.2.48 AT+BTD*
{Remove All Trusted Device}
This command is used to remove all devices from the list of trusted devices in the non-volatile database.
No confirmation will be asked for. So beware !!!
Response:
OK
2.2.50 AT+BTR
{Set Peer Address}
This command is used to store a peer address in non-volatile storage. A value of 000000000000 has the
special meaning of invalid peer address.
This command is used to set up a module in pure cable replacement mode.
If S register 512 = 1 and the peer address is NOT 000000000000, then it will periodically (time specified
via S register 505) attempt to connect to the peer address specified.
If S register 512 = 3 or 4 then it will wait for an inbound connection from the peer address specified. If the
peer address is not 000000000000, then it waits for a connection from the specified master, otherwise will
connect to anyone.
Response:
OK
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
2.2.49 AT+BTR?
Issue No :
1.9
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Page 18 of 38
{Display Peer Address}
This command is used to display the peer address stored in non-volatile storage, used to put the module in
pure cable replacement mode.
Response:
12346789012
OK
If the location is empty the the response is as follows.
Response:
00000000000
OK
2.2.51 AT+BTAn
{Control Audio Channel}
Once a Bluetooth connection is active, and assuming the peer device is a TDK Serial Module, this
command is used to start/stop a SCO channel which will connect the PCM interfaces of the two peer
devices. This means that if a codec is attached to the PCM pins, then 2 way audio can be established.
The parameter is 0 to switch off the channel and it is 1 to switch it off.
On receipt of the command, the following response immediately follows.
Response:
OK
The lower layers then go through the process of seting up the SCO channel, and as soon as a SCO link is
established, the following response is asynchronously sent to the host.
Response:
AUDIO ON
Or if the SCO failed to be established …
Response:
AUDIO FAIL
On the peer device, the host will asynchronously get ….
Response:
AUDIO ON
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3.
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 19 of 38
Unsolicited Responses
The ‘AT’ Protocol is a command/response type of protocol. This means that the TDK Serial Module will
normally only respond to AT commands.
Under special circumstances, unsolicited responses will be sent to the host. They are described in the
following subsections.
3.1
RING
This string is sent to the host when a remote device is initiating a serial port connection. The fully qualified
string is in the form RING 012345678901 where 012345678901 is a 12 digit hex number which
corresponds to the remote device’s Bluetooth address. This response is sent to the host every 2 seconds
until the host either accepts the connection using the ATA command or rejects it using the ATH command.
3.2
PIN?
This response is sent to the host during a pairing negotiation.
The fully qualified string is PIN? 012345678901 where 012345678901 is the Bluetooth address of the peer
device. In response, the host must supply a pin code which is entered using the AT+BTK command.
If the peer address does not supply the address in the message exchange, then the address is specified
as 000000000000 – and the paring will proceed as normal.
3.3
AUDIO ON
This response is sent to the host when a SCO channel has been established.
3.4
AUDIO OFF
This response is sent to the host when an existing SCO channel has been closed.
3.5
AUDIO FAIL
This response is sent to the host when a SCO channel setup fails.
3.6
ERROR 27
This response is sent to the host on power up if the firmware is unlicensed.
3.7
PAIR n 
This response is sent to the host on termination of a pairing process. If pairing was successful then ‘n’ = 0,
if a timeout occurred then ‘n’=1 and for all other unsuccessful outcomes the value will be 2.
The parameter  is the address of the peer device if available.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
4.
3 Feb 03
Issue No :
1.9
Doc No :
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Page 20 of 38
Incoming Connections
The serial module can be configured using the AT+BTP or AT+BTG command so that it will scan for
incoming connections from other Bluetooth devices.
When the lower layers detect an incoming call, a RING 123456789012 string is sent to the host every
second. The command ATA is used to accept the connection and ATH to reject it.
On connection, if the S0 Register is >=0 then confirmation to the host is in the form:CONNECT 123456789012
CONNECT 123456789012 A
CONNECT 123456789012 E
CONNECT 123456789012 AE
Where ‘A’ means authenticated connection and ‘E’ means encryption has been enabled.
When S0 register is -1, neither RING nor CONNECT is sent to the host and the connection is silently
accepted.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
5.
3 Feb 03
Issue No :
1.9
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Page 21 of 38
Dropping Connections
In a conventional telephony modem, a call is normally terminated by first sending a +++ character
sequence enveloped by an escape sequence guard time (of the order of 100 to 1000 milliseconds) and
then the ATH command.
This device will provide a couple of ways of dropping a connection. One method will be similar to the
above, but instead a ^^^ character sequence is used, this is to eliminate ambiguity when a data call is in
progress via a mobile phone which was established using the mobile phone’s Bluetooth AT modem. The
second method will involve the host dropping the DTR (DSR from the module’s viewpoint) handshaking
line.
Being able to drop a connection using the escape sequence ^^^ has a severe penalty on data throughput,
in fact, the data rate is of the order of 85kbps instead of about 200kbps. To cater for this performance hit,
the device’s connection drop capability is configurable to be in one of two modes.
One mode allows for a connection to be dropped using either method, and the other mode allows for a
connection drop using the DTR method only. By default, the device is in former mode. This mode is
selected using the S507 register. See S register table described in an earlier section.
To reiterate, the escape sequence is as follows:
This means that even when a file transfer is occurring and it happens to be full of  characters
then it is not going to drop into command mode because, when transferring a file it is going to happen as
fast as possible and so the inter character gap is going to be significantly shorter than the .
The  character can be changed via the S2 register and the  interval can be
specified via the S12 register.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
6.
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 22 of 38
Pairing and Trusted Devices
When authentication is enabled via S register 500 or when using the ‘u’ modifier in the ATD and AT+BTP
commands, a connection attempt will require a link key for the peer device. The link key can be obtained
prior to connection by invoking the AT+BTW and AT+BTK commands. A new link key can be obtained as
often as required and is stored in a volatile cache. At any time, this cached link key can be added to the
trusted devices database using the AT+BTT command. A trusted device can be deleted using the AT+BTD
command. To view a list of trusted device issue the command AT+BTT?.
When a connection attempt requires a link key, the trusted device database will be searched automatically
and if one exists will be provided without host interaction. If the link key is not present, then the connection
attempt will be terminated and a NO CARRIER response will be given to the ATD command.
A typical session to pair, say an Ericsson T68i, to a serial module would be …
•
•
•
•
•
•
•
•
•
•
Make the T68i discoverable and send AT+BTI to the serial module. This will result in inquiry
responses from all devices. Make a note of the Bluetooth address of the phone e.g 123456789012
On the T68i start pairing procedure by selecting “Phone accepts” in the relevant Bluetooth menu.
Send command AT+BTW123456789012 to the serial module
Confirm that you get an OK response and then PIN? responses on a 2 second interval.
Enter a pin key on the phone. Say it is 1234
Then enter the command AT+BTK=”1234”.
The phone will confirm success and likewise the serial module will respond with OK
On success the serial module will send an unsolicited message in the form of PAIR 0 
Send AT+BTT to the serial module so that the pairing information is stored in the non-volatile
database.
Confirm that the link key has been stored by sending the command AT+BTT?. This will result in a
list of all devices paired with the module.
If two serial modules need to be paired, then it can be accomplished as follows:•
•
•
•
•
•
•
•
To module 1 send ATI4, it will respond with the local Bluetooth address. Eg 123456789001
To module 1 send AT+BTP. It will become discoverable and connectable.
To module 2 send AT+BTW123456789001 and it will respond with OK
Then on both modules you will see PIN? asynchronous responses
To both modules send AT+BTK=”1234”
On success the serial module will send an unsolicited message in the form of PAIR 0 
The pairing link key, is at this stage, in volatile memory, so send AT+BTT to both.
The two units now have pairing information which will survive a power cycle.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
7.
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 23 of 38
Error Responses
All error responses from the device will be in the form ERROR nn, where nn will be a number
in the range 00 to 99. There shall be leading 0s if the error value is less than 10.
The error values shall be designated as follows:Error
01
02
03
04
05
06
06
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Description
Register not recognised
Value for register is out of range
Incoming call NOT pending
No call to connect to. This error code has meaning for ATO only
Syntax Error
Empty String
Device Class could not be stored
Invalid Device Class Code
Invalid Bluetooth Address
Could not set Service name
PS Store Write
PS Store Read
Not Idle
Incorrect Mode
Already Scanning
Pairing is already in progress
Not USED
Not USED
Not USED
Not safe to write to Non Volatile Store - Ongoing Bluetooth Connection
Link Key Cache is Empty
Link Key Database is Full
Malloc returned NULL - Resource Issue
ATD Remote Address same as Local Address
Connection Setup Fail, DSR Not asserted
Unauthenticated licence
Max Responses (See S Reg 518) too high. Memory allocation error
The length of Pin in AT+BTK is too long
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
8.
3 Feb 03
Issue No :
1.9
Doc No :
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Page 24 of 38
Pin Out
The TDK Bluetooth Serial Module is physically accessed via a 40 way mini-pci connector. The pin
allocation is as follows:PinNo
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
Signal
RESERVED
RESERVED
SPI_MOSI
SPI_CSB
SPI_CLK
GND
RESET
GND
SPI_MISO
UART_CTS
UART_TX
UART_RTS
UART_RX
VCC_3V3
USB_5V
N/C
N/C
GND
N/C
VCC_1V8
Description
Do Not Connect
Do Not Connect
SPI bus serial in I/P
SPI bus chip select I/P
SPI bus clock I/P
Reset I/P
SPI bus serial out O/P
Clear to Send I/P
Transmit Data O/P
Request to Send O/P
Receive Data I/P
3.3V Output
3.6V < VIN < 6.0V
1.8V Output
PinNo
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
Signal
GPIO1
GPIO2
UART_RI
UART_DCD
UART_DSR
GPIO3
GPIO4
GPIO5
GND
PCM_CLK
PCM_IN
PCM_SYNC
PCM_OUT
N/C
GND
RESERVED
RESERVED
GND
GND
N/C
Description
I/O for Host.
I/O for Host
Output
Output
Input
I/O for Host
I/O for Host (Right LED)
I/O for Host (Left LED)
PCM Clock I/P
PCM Data I/P
PCM Sync I/P
PCM Data O/P
Do Not Connect
Do Not Connect
Notes:
•
•
•
•
•
•
UART_RX,UART_TX,UART_CTS,UART_RTS,UART_RI,UART_DCD,UART_DSR are all 3.3v
level logic. For example, when RX and TX are idle they will be sitting at 3.3V. Conversely for
handshaking pins CTS,RTS,RI,DCD,DSR a 0v is treated as an assertion.
Pin 6 (UART_RI) has inverse logic. It is normally 3.3v. When a remote device initiates a
connection, this pin goes low. This means that when this pin is converted to RS232 voltage levels
it will have the correct voltage level for assertion.
Pin 8 (UART_DCD) has inverse logic. It is normally 3.3v. When a connection is live this pin is low.
This means that when this pin is converted to RS232 voltage levels it will have the correct voltage
level for assertion.
Pin 10 (UART_DSR) is an input, again with inverse logic. It should be connected to the DTR
output of the host. When the serial module is in high speed mode (See definition for S reg 512),
this pin should be asserted by the host to ensure that the connection is maintained. A deassertion
is taken to mean that the connection should be dropped, or an online command mode is being
requested.
The GPIOn pins can be accessed using S Registers 621 to 625
GPIO4 and GPIO5 are also connected to LEDs on the module. If these i/o pins are set for input,
then the LED will be driven by the host and appropriate drive current requirements must be
satisfied. By default GPIO4 is used to drive the right led which indicates connection status.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
9.
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 25 of 38
RS232 Signal Pin Mapping
Just as a telephony modem has control and status lines, the TDK serial module also provides for 3 control
and status lines as per the table below. The direction column is as seen from the module’s viewpoint.
Direction
OUT
OUT
IN
Function
CI also known as RI (Ring Indicate)
DCD (Data Carrier Detect)
DSR (Data Set ready)
All three lines are under program control and as such require GPIO pins. The mapping will be as per the
table below
BC2_PIO
Pin
Direction
IN/OUT
IN/OUT
OUT
OUT
IN
IN/OUT
IN/OUT
IN/OUT
Connector
Pin Label
GPIO1
GPIO2
UART_RI
UART_DCD
UART_DSR
GPIO3
GPIO4
GPIO5
Function
General Purpose I/O
General Purpose I/O
Output from module
Output from module
Input to Module
General Purpose I/O
General Purpose I/O (Right LED)
General Purpose I/O (Left LED)
Notes:
BC2_PIO4 (DSR) is used by the serial module to sense that the host is connected, and is
intricately linked with connections. For outgoing calls, if this line is not asserted then an error is
immediately. Similarly for AT+BTP and AT+BTG.
While in a call, for appropriate modes, a deassertion means fall into command state. If the
deassertion exists for longer than the period specified in S register 519 then the connection is
dropped as if an ATH command was received.
BC2_PIO2 (RI), is normally deasserted. When an incoming connection is detected it will be
asserted, until the connection is either answered or rejected using ATA and ATH respectively.
Unlike normal telephony modem, this line does not follow the state of RING tone. Basically it
is asserted for incoming call setup to allow for a host to wakeup etc.
As this pin is connected to an LED, there will be visual indication when RING is being indicated.
BCS_PIO3 (DCD) will be deasserted when the device is in the unconnected state. Asserted when
a connection is active. In addition since this pin also controls an LED on our device, there is
visual indication of a connection.
GPIO Pins 1,2,3,4 and 5 are available for general purpose use.
BREAK
If the host sends a break signal of duration greater than 100ms, then the serial module is
configured to treat that as a signal to perform a hardware reset.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 26 of 38
10. Power Consumption and Reset
10.1 Reset
The module can be reset by the host without the need of any i/o using a BREAK signal. The module has
been configured to reset when the RX line detects a break condition for durations greater than 100
milliseconds.
10.2 Power Consumption
The current drain from the Vcc power input line is dependent on various factors. The three most significant
factors are the voltage level at Vcc, UART Baudrate and the operating mode.
The hardware specification for the serial module allows for a voltage range of 3.6 to 6.0v at Vcc. Tests
have shown that there is no significant difference in current draw when Vcc is 5 or 6V. Therefore the data
presented below, pertains to Vcc levels of 3.6 and 5v only. Tests have shown that where power drain is an
issue, it is best to keep Vcc at the lower end of the range.
The UART baudrate has a bearing on power drain because as is normal for digital electronics, the power
requirements increase linearly with increasing clocking frequencies. Hence higher baudrates result in a
higher current drain.
Finally with regards to operating mode the significant modes are; idle, waiting for a connection, inquiring,
initiating a connection and connected. With connected mode, it is also relevant to differentiate between do
data being transferred and when data is being transferred at the maximum rate possible.
The operating mode can best be described by stating the AT commands required to enter that mode. In
addition, there are certain S Registers which have a direct impact on power consumption, which are
described next.
The serial module has 2 Leds which can be configured to display connection status. One led is used to
display connection status, while the other is used to either display ‘Ring Indicate’ status or follow the state
of the incoming DSR line on the UART interface. Tests have shown that these Leds can consume up to
5.3mA which is more than double the current draw when in Idle mode. Therefore S registers 533 and 534
can be used to completely disable these indications.
Finally S Registers 508 to 511, which specify the page and inquiry scan intervals and windows, can be
used to adjust the average current drain when in discoverable and or connectable modes. Registers 508
and 509 specify the interval and window for page scans and registers 510 and 511 specify the interval and
window for inquiry scans. Register pairs 508/509 and 510/511 describe duty cycles when the serial
module goes into scan modes. It is while scanning that the highest current draw occurs. The average
current draw is determined by simple arithmetic using the values stored in the 508/509 and 510/511
register pairs.
The operating modes described above are entered using AT commands as follows:Idle
Wait for Connection
Discoverable Only
Connecting
Connected
On power up, with S Reg 512 = 1
AT+BTG (100% page scan duty cycle)
AT+BTQ (100% inquiry scan duty cycle)
ATD
No Data
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Connected
Issue No :
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Page 27 of 38
Max data transfer
All current consumption values in the table below assume that the connection status indication functionality
of the Leds has been disabled by setting S Registers 533 and 534 to 0.
All current values are in milliamps.
Current per Led
Idle Mode, S512=1
Wait for Connection Or Discoverable Mode, AT+BTP
S508=S510=640, S509=S511=320
Wait for Connection Or Discoverable Mode, AT+BTP
S508=S510=1000, S509=S511=11
Inquiring Mode, AT+BTI
Connecting Mode (ATDxxx)
Connected Mode (No Data Transfer)
Connected Mode (Max Data Transfer)
3.6v
5.0v
9600
3.20
5.30
Baudrate
38400
115200
3.20
3.20
5.30
5.30
460800
3.20
5.30
3.6v
5.0v
3.6v
5.0v
3,6v
5.0v
3.6v
5.0v
3.6v
5.0v
3.6v
5.0v
3.6v
5.0v
9600
1.60
2.00
59.00
65.00
2.75
3.26
50.00
54.00
50.00
54.00
6.00
7.20
21.50
24.50
Baudrate
38400
115200
1.80
1.96
2.10
2.30
59.00
59.00
65.00
65.00
2.94
3.10
3.36
3.55
50.00
50.00
54.00
54.00
50.00
50.00
54.00
54.00
6.10
6.40
7.20
7.40
22.50
24.50
26.00
28.00
460800
3.00
3.40
59.00
65.00
4.12
4.63
50.00
54.00
50.00
54.00
7.20
8.20
32.50
36.00
As can be seen, the current drain while waiting for a connection or discoverable mode is about 30 times
higher than in idle mode. This is when the page/inquiry scan duty cycle is 100%. These modes gives the
quickest response to a page or inquiry request from a remote peer.
It is possible to reduce the duty cycle down to as low as 0.5% at the expense of response time. The
response time can be specified via S Reg 508 and 510 for page and inquiry respectively, where the worst
case response time can be as high as 2.5 seconds. Then the duty cycle can be varied by changing the
value of S Regs 509 and 511 appropriately.
For example, if SReg 508 and 510 are both set to 1000ms and SReg 509 and 511 are both set to 11ms
then the duty cycle is reduced to 1%, this means that average current drain at 5.0v will be 2% of 65mA
plus the normal idle mode current, that is, it is as low as 2.75mA. However, in this case, it can take up to 1
second to establish a connection.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 28 of 38
11 Pure Cable Replacement Mode
11.1 Data Cable
The module has the capability of being preset into a pure 5-wire data cable replacement mode. The 5
wires being RX,TX,CTS,RTS and GND. This mode requires no changes to a host application since the
Bluetooth connection is automatically setup on power up and will retry when the connection drops.
By implication, two devices are needed to replace a cable. One device is pre-configured to always be a
master and the other, a slave.
Assuming the bluetooth address of the master to be  and that of the slave to be ,
the master module is configured by sending it the following AT commands.
AT&F
ATS512=1
ATS504=1
ATS507=2
ATS530=2000
AT&W
AT+BTR
Where the ATS507=2 setting puts the device in DSR drop mode only. This means that when the device
needs to be reconfigured, deasserting the DSR line will ensure that the module responds quickly to AT
commands. This further means that in stand alone mode, the DSR input line MUST be asserted e,g 0v in
TTL signal mode.
The slave is configured by,
AT&F
ATS512=4
ATS0=-1
AT&W
AT+BTR
Where  is optional. If it is not specified, then the slave unit will accept connections from any
device. If specified then only connections from the device specified will be accepted.
If it is desired that the slave unit not be discoverable (the master is by default not discoverable), then the
configuration commands are,
AT&F
ATS512=3
ATS0=-1
AT&W
AT+BTR
Where  is optional. If it is not specified, then the slave unit will accept connections from any
device. If specified then only connections from the device specified will be accepted.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 29 of 38
When the units are next power cycled, the slave unit will wait for the master to connect to it and the master
will continually look for the slave. If a connection attempt fails, the master will wait for 2 seconds before
reattempting a connection. This 2 second delay can be varied by issuing it an ATS530 command with an
appropriate value in the range 100ms to 15000ms.
IMPORTANT NOTE: When S Reg 507 = 0, the DSR input to the module MUST be asserted for
the auto connection to succeed. When operating at TTL levels a 0V is seen as an assert state.
When operating at RS232 levels and voltage greater than 3V is seen as assert. It is usual to
connect the DTR line of the host to the DSR line of this device.
11.2 Audio Cable
With a pair of these modules it is possible to replace a mono audio cable with two way traffic. That is, a
setup where a microphone is connected to a speaker at the remote end and vice versa. So this mode
effectively replaces two audio cables.
Assuming the bluetooth address of the master to be  and that of the slave to be ,
the master module is configured by sending it the following AT commands.
AT&F
ATS512=1
ATS504=1
ATS530=2000
ATS532=1
AT&W
AT+BTR
And the slave is configured by,
AT&F
ATS512=4
ATS0=-1
AT&W
AT+BTR
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 30 of 38
12. Frequently Asked Questions
1. I know my mobile phone’s Bluetooth address and have successfully paired as detailed in
Chapter 6. When I try to make a connection using ATD it always fails?
Mobile phones are very security conscious, so always insist on authenticated
connections. So to make a connection, use the ATDU variant of the
command.
2. I have paired with a mobile phone and configured the device in cable replacement mode
as detailed in Chapter 10, but I keep getting “NO CARRIER” responses.
Set S register 502 to 1 so that the default for outgoing connection will ask for
authenticated connections. For security reasons most phones will only allow
authenticated Bluetooth connections.
3. When my module is configured for cable replacement, on connection I want to suppress
the “CONNECT” response sent to the host, so that the first character my host sees is the
first character from my actual data traffic.
Set S register 504 to 1
4. I cannot get data transfer rates greater than 92kbps.
You probably have the uart baudrate set to 115200. (115200 * 8 / 10 = 92160) where
the *8/10 factor arises from the start and stop bit overhead.
Set the uart baudrate to say 230400 or 460800 via S register 520, assuming your
host can cope with the higher baudrates. Setting the buadrate to 921600 will
guarantee that the UART is never responsible for the bottleneck.
5. I have done as suggested in 4 above and I still don’t get the 200kbps claimed in the data
sheet.
Set S register 507 to 2 and ensure that the DSR input to the module is asserted. If
DSR is not asserted in this mode, then all connections attempts will be aborted.
6. I modified S Registers to put the device in cable replacement mode and nothing happens
after a power cycle.
Ensure that the modified S registers are stored in non-volatile storage by sending
the command AT&W
7. Can I suppress character echoes when in command mode?
Yes. Set S Register 506 to 0
8. When I establish a connection, I want an SCO channel (Audio) to be started automatically.
Set S Register 532 to 1
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 31 of 38
9. After a successful connection, I want to remain in command mode so that I can send more
AT commands and then when done, go to online mode by issuing the ATO command
Set S Register 531 to 1
10. When in connected and online mode, I want to drop into command mode using the more
usual +++ escape sequence instead of ^^^
Set S Register 2 to 43
11. When I perform an inquiry using AT+BTI I only get 8 responses, yet I know I have more
than 8 devices in the neighbourhood.
Set S Register 518 to a larger value than the default 8 before issuing the AT+BTI
command
12. When doing an inquiry I want to get the friendly names as well, along with the devices
class codes.
Instead of the AT+BTI command, issue the variant AT+BTIN
13. When my connected device goes out of range, it takes too long for a “NO CARRIER”
response from the device.
Set S Register 535 as desired. It modifies the baseband link timeout appropriately.
14. The cable between my host and the serial module has just RX,TX,GND. I get no
responses from the serial module.
Pull the CTS line of the serial module to the asserted state (0V).
15. Can I disable CTS/RTS handshaking and use XON/XOFF handshaking?
No. If your host does not have CTS/RTS handshaking capability, we suggest you set
the UART baudrate to something less than 38400 and link the CTS pin of the module
to a permanently asserted state. The higher bit rate capability on the RF side should
ensure that the receive buffer of the serial module will remain empty.
16. I have changed S Register 512 so that on power up it comes in mode 4. But nothing
seems to happen, in fact after power cycle, the value is as if I had never changed it.
After modifying the S register, enter the command AT&W so that the new value is
stored in non-volatile storage.
17. I have set S Reg 507 to 1 and specified a peer address using AT+BTR, but I still don’t get
an auto connection.
Ensure that DSR of the device is asserted (ie at 0v when operating at TTL levels or >
+3V when operating at RS232 levels .
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 32 of 38
13. Development Motherboard
TDK have developed a motherboard which allows the serial module to be connected directly to a PC. This
motherboard provides RS232 level conversion and a standard 9 way D-Type connector. In addition it also
has a 25 way D-Type connector which gives access to the SPI bus on the serial module for firmware
updates and there is a headphone socket which allows for experimentation with the serial modules audio
capability.
A picture of the serial module mounted on the motherboard is presented below.
The 9 way D-Type connector is a socket, and the pin-out is such that it can be plugged straight into a PC
serial port. Alternately, if access to the serial port of the PC is restricted, an extension cable with all 9 wires
can be used to connect the two.
Similarly, for firmware updates, assuming the PC has been loaded with the appropriate tools (CSR’s
Bluelab), the 25 way D-Type connector, can be plugged straight into the LPT port of the PC.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 33 of 38
The pin-out for the 9 way serial connector is as per the table below, and the direction is as seen from the
serial modules point of view.
Pin No.
Description
Data Carrier Detect
Transmit
Receive
Data Set Ready
Ground
Data Terminal Ready
Clear To Send
Ready To Send
Ring Indicate
Direction
DCD
TX
RX
DSR
GND
DTR
CTS
RTS
RI
Output
Output
Input
Input
--Output
Input
Output
Output
One of the main features of the TDK serial module is that it enables the replacement of a serial cable
between a PC and a peripheral such as a modem.
The pin-out on modems is as per the table above, so if the serial cable between a peripheral like a modem
and a PC is to be replaced with 2 serial modules, then the motherboard will plug into the PC as is.
However, the pin-out and the gender at the modem end are not one to one compatible with the
motherboard. So to facilitate a connection, a null modem cable is required as per the diagram below
Modem
Peripheral End
DCD>
RX<
TX>
DTR>
GND
DSR<
RTS>
CTS<
RI>
9 way D-Type MALE
Serial Module End
1:DCD>
2:TX>
3:RX<
4:DSR<
5:GND
6:DTR>
7:CTS<
8:RTS>
9:RI>
In the case of a peripheral which only has a 3 wire uart interface consisting of RX,TX, and GND. Where it
relies on software handshaking, then the cabling between it and the serial module should be as shown in
the diagram below. The XON/XOFF handshaking will be observed by the peer NOT the serial module.
Peripheral End
3 Wire UART
RX<
TX>
GND
© TDK Systems Europe Ltd 2003
9 way D-Type MALE
Serial Module End
1:DCD>
2:TX>
3:RX<
4:DSR<
5:GND
6:DTR>
7:CTS<
8:RTS>
9:RI>
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
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Page 34 of 38
In the case of a peripheral which has a 5 wire uart interface consisting of RX,TX, and GND and the
hardware handshaking flow control lines CTS and RTS. The cabling between it and the serial module
should be as shown in the diagram below. The RTS/CTS flow control will be handled by the serial module.
Peripheral End
5 Wire UART
RX<
TX>
GND
RTS>
CTS<
9 way D-Type MALE
Serial Module End
1:DCD>
2:TX>
3:RX<
4:DSR<
5:GND
6:DTR>
7:CTS<
8:RTS>
9:RI>
Finally in the case of a peripheral which has a 7 wire uart interface consisting of RX,TX, and GND and the
hardware handshaking flow control lines CTS and RTS plus DSR and DTR. The cabling between it and
the serial module should be as shown in the diagram below. The RTS/CTS flow control will be handled by
the serial module. In this configuration, an intelligent peripheral will be able to take advantage of the full
200kbps datarate capability where it utilises a brief deassertion of DTR to change from online to onlinecommand mode.
Peripheral End
7 Wire UART
RX<
TX>
DTR>
GND
DSR<
RTS>
CTS<
© TDK Systems Europe Ltd 2003
9 way D-Type MALE
Serial Module End
1:DCD>
2:TX>
3:RX<
4:DSR<
5:GND
6:DTR>
7:CTS<
8:RTS>
9:RI>
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 35 of 38
14. Use Cases
14.1 Example 1: Light Switch Controller
14.1.1 Background
A small microcontroller controlling a single light switch. The microcontroller’s serial port is connected to
the serial module and a digital output line drives a relay which controls a light. The remote host sends the
text “ON” to switch on the relay and “OFF” to switch it off.
14.1.2 AT Command Sequence
AT Command
ATZ
Response
OK
Comment
Resets the device and sets all S Register values as per
the values in non-volatile memory database.
ATS0=1
OK
Auto answer incoming connection after 1 ring
AT+BTP
OK
Will accept incoming connection from any device and will
also be discoverable
CONNECT 123456789012
Call has been answered automatically, and the Bluetooth
address of the peer device is provided.
At this point the light switch protocol takes in commands from the remote. For example ON, OFF etc
NO CARRIER
If the remote end drops the connection
OR
^^^
OK
Puts the device in to command mode
ATH
OK
Drops the call.
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 36 of 38
14.2 Example 2: Remote Data Logger
14.2.1 Background
A data logger on a remote site gathers data which is then transferred to a central site via a Bluetooth
enabled phone. Assume that the remote site is accessed via the telephone 02089388609 and the PC
connected to the modem logs the data to a file, so all the data logger has to do is open a connection and
then send textual data corresponding to the gathered data.
Assume that the data logger knows the BT address of the phone and assume it is 123456789012
Further assume that the Bluetooth Phone exposes a serial port profile through which an AT modem can be
accessed.
14.2.2 AT Command Sequence
AT Command
ATZ
Response
OK
Comment
Resets the device and sets all S Register values as
per the values in non-volatile memory database.
ATD12345678901
CONNECT 123456789012
ATZ
OK
The reponse is coming from the Bluetooth phone
ATD02089388609
CONNECT
The data logger sends data which is captured at the remote end.
+++
OK
Puts the Bluetooth Phone Modem into command
mode
ATH
OK
Drops the call to 02089388609
^^^
OK
Puts the device into command mode
ATH
OK
Drops the Bluetooth connection
© TDK Systems Europe Ltd 2003
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 37 of 38
14.3 Example 3: Trusted Device Management
14.3.1 Background
Bluetooth provides for secure connections through the use of link keys. The link keys are 128 bit entities
which are uniquely created for each BT device via the device’s Bluetooth address. Since all BT addresses
are unique, this results in unique keys.
The link keys are ‘private’ objects and as such are never exposed via the AT interface. They at all times
remain within the serial device. Therefore the serial module allows link key management by using
Bluetooth addresses as handles.
The device has a database of link keys. Each record in the database has two fields. One field contains the
Bluetooth address and the other contains the 128 bit link key. Only the address field is viewable.
The following subsections describe AT command sequence for typical pairing functions.
14.3.2 Obtain a new Link Key
This process will obtain a new link key for a remote device whose address is 123456789012 and whose
pin code is known to be 12345.
AT Command
AT+BTW12345678901
AT+BTK=”12345”
Response
OK
Comment
PIN? 123456789012
PIN? 123456789012
OK
This is sent to the host every 2000ms
PIN 0 123456789012
Pairing complete. The link key is stored in a volatile
cache
Pairing successful
14.3.3 Store link key in trusted device database
This process assumes that the procedure described in “Obtain a new link key” has been done and there
exists a link key in the cache, and that the database is not full.
AT Command
AT+BTT
Response
OK
Comment
14.3.4 List trusted device database
This process assumes that the procedure described in “Obtain a new link key” has been done and there
exists a link key in the cache, and that the database is not full.
AT Command
AT+BTT?
Response
123456789012
123456789013
123456789014
123456789015
123456789016
OK
© TDK Systems Europe Ltd 2003
Comment
Bluetooth Serial Module
AT Command Set
Date :
3 Feb 03
Issue No :
1.9
Doc No :
XRBLU020-001SW-0
Page 38 of 38
14.3.5 Store link key in trusted device database (full)
This process assumes that the procedure described in “Obtain a new link key” has been done and there
exists a link key in the cache, and that the database is full.
AT Command
AT+BTT
ATI6
AT+BTT?
AT+BTD123456789016
AT+BTT
Response
ERROR
OK
123456789015
123456789016
….
123456789015
OK
OK
OK
© TDK Systems Europe Ltd 2003
Comment
The data base is full
The maximum size of trusted devices database
Deletes the key associated with 123456789016
The store will work

---

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