AT Command Manual
v1.5
©2013 LM Technologies Ltd
www.lm-technologies.com
Page 19 of 26
Automatic pairing (also known as Just Works) takes place on connection with remote Bluetooth 2.1
complaint device. The current setting can be retrieved by sending this command in query format.
Extra commands related to Bluetooth 2.1 security have been added in v6.17 firmware running on
LM780/LM400/LM072 modules.
2.8.28.1
AT+DPIN= XXXXXXXXXXXX,dddd<cr>
This command is used to specify dynamic PIN code for secured connection with specified
remote Bluetooth 2.0 device. Here, the parameter ”dddd” is a 4-8 digit pin code string and
“XXXXXXXXXXXX” is address of remote Bluetooth 2.0 device. This command must be sent by
host on receiving the PINCODE REQ “XXXX-XX-XXXXXX” event from the module. Refer to
section 2.9.2 for details.
2.8.28.1.1
Response
<command_response>
2.8.28.2
AT+DPIN?<cr>
2.8.28.2.1
Response
<cr,lf><DPINc><command_response> if the command is successful. Here, c- current
setting. E.g on default setup, the response will be <cr,lf>DPIN<command_response>.
2.8.28.3
AT+DPIN+<cr>
This command will enable use of dynamic pin code instead of fixed pin code for secured
connections with remote Bluetooth 2.0 device. The remote device as well as local device
must enable pin code security in order to connect successfully with local device. The
dynamic pin code will only be used if pin code security has been enabled. Refer to section
2.8.17.4 AT+PIN+<cr> for details.
In firmware v6.17 running on LM780/LM400/LM072 modules, dynamic pin code use will
have no effect during connection with remote Bluetooth 2.1 complaint device. Refer to
section 2.8.17, 2.9.2 for details.
2.8.28.3.1
Response
<command_response>
2.8.28.4
AT+DPIN-<cr>
This command is used to disable use of dynamic pin code for connections with remote
Bluetooth 2.0 devices. The local Bluetooth device will use fixed pin code during connections
if pin code security has been enabled.
2.8.28.4.1
Response
<command_response>
2.8.29
AT+IOTYPE
This command is only available in v6.17 firmware running on LM780/LM400/LM072 modules. This
command configures input output device type required for connection with remote Bluetooth 2.1
device. By default, IOTYPE is 3 which mean “No Display No Keyboard”. The current setting can be
retrieved by sending this command in query format.
2.8.29.1
AT+IOTYPEn<cr>
where n – varies from 0 to 4 depending on device type used.
N
Device Type/capability
