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Chapter 2 – AT Commands
Multi-Tech Systems, Inc. SocketWireless Bluetooth AT Commands (S000360H) 31
Read Memory Locations (S-Registers) Commands
SR21 Read PIO Level
This command reads the PIO logic level.
Format: ATSR21,<PIO#>
Parameters PIO#: 2-7
Return Parameters: <Logic Level>
EXAMPLE:
Type: ATSR21,3<cr>
Reply: <cr_lf>OK<cr_lf>
<cr_lf>1 <cr_lf>
Set Using: ATSW23
Inquiry Commands
The inquiry command is used to discover all Bluetooth radios (within range) that match a certain Class of Device
(COD). If the COD is not known it is best to use 00000000 which allows discovery of all devices. You can not be
in the default slave mode and perform an inquiry command. Only a Master or a Radio in idle mode can perform
an inquiry.
DI Inquire
This command is used to discover other Bluetooth devices.
Format: ATDI,<Max Radios to Discover>,<COD>
Parameters:
• Max Radios to Discover: 0-60,000
• COD: Exactly 8, 16-bit hex values (0 thru F) based on the Bluetooth COD
specification names published and maintained by the Bluetooth SIG.
Note: With the minor filter enabled using ATSW24, inquiry results are
filtered by the lower 4 bytes of the COD. If the minor filter is disabled all
devices are found.
Return Parameters: <BT Address>,<COD> (Repeated by number of radios found)
• An “OK” is returned immediately following this command. “DONE” will
appear after all devices have been found, or an inquiry timeout has
occurred while searching for the number of devices specified.
EXAMPLE MASTER:
TYPE: ATDI,1,00000000<cr>
REPLY: <cr_lf>OK<cr_lf>
<cr_lf>00A0961F2023,00000000<cr_lf>
<cr_lf>DONE<cr_lf>
OR
<cr_lf>ERROR<cr_lf>
Notes:
• Recommend executing an ATUCL command to put the radio in idle mode prior to
executing an Inquiry command. See Utilities section.
• Due to a CSR bug, there is no guarantee that the radios returned by an inquiry will all
be unique – duplicates can occur. This seems to happen if the inquiry doesn’t discover
the maximum number of radios. After discovering all of the radios it can, it will then
start to return duplicate radios that it has already discovered until the maximum is
reached or the inquiry times out.
• The request for friendly name is a separate message request in the new CSR firmware
– see ATRRN.
- AT Commands 1
- Reference Guide 1
- Table of Contents 3
- Chapter 1 – Introduction 5
- Changing Configuration 6
- Using Multi-Point Mode 8
- Multipoint Examples 9
- Multi-Point Test Scenarios 10
- Repeater Mode 12
- Chapter 2 - AT Commands 13
- URST Reset 14
- FRST Factory Reset 14
- SI Status Information 15
- Security Commands 19
- Set and Read Device Name 20
- RSN Read Service Name 21
- SP Set PIN 22
- OP Overwrite PIN 23
- Configuration Commands 24
- SW22 Write PIO Direction 26
- SW23 Write PIO Level 27
- SW26 Lock User Settings 29
- SW27 Write LED Rate 29
- SW29 Write PIN Lock Mode 30
- SW30 Write Deep Sleep Mode 30
- Inquiry Commands 31
- Connect as Master Commands 32
- DC Dial Channel 33
- DL Dial Last 34
- LAST Read Last Address 34
- MACLR Master Address Clear 35
- Connect As Slave Command 36
- Disconnect Commands 36
- About Command/Data Mode 37
- Data Mode Commands 37
- Utilities – Cancel Command 38
- Pairing Commands 39
- Low Power Modes Using Sniff 40
- SNIFF Enable Sniff 40
- SSNIFF Enable Auto Sniff 41
- CSNIFF Clear Sniff 41
- XSNIFF Exit Sniff Mode 41
- PARK Enable Park 42
- XPARK Exit Park 42
- Golden Receive Power Range 42
- RSSI Get RSSI Value 42
- LQ Get Link Quality 43
- Max Power Command 44
- Variable Storage Commands 45
- PIO Logic Commands 46
- Commands 47
- FTP Client 48
- DHFTP Dial Hang Up FTP 49
- FTPB FTP Browse 49
- FTP Push/Pull Commands 51
- FTP Server 52
- DOPP Dial OPP 53
- DHOPP Dial Hang Up OPP 53
- OPP Push/Pull Commands 54
- Chapter 4 – Examples 59
- From Power Up 60
- Headset Point-to-Point 60
- Headset Multipoint 60
- Example Client Applications 61
- Description Requires 69
- Appendix B – Responses 72
- Appendix C -- UUID Table 79
- Consumption 80
- Command Responses Comparison 81
- Abbreviations 85
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