User's Manual

Class 1 Bluetooth v2.0 Module
User’s Guide
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www.lairdtech.com/bluetooth
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CONN-GUIDE-BT730_v0.9
Response: <cr,lf>OK<cr,lf>
6.3.17 ATZ<n>{Hardware Reset and emerge into mode ‘n’}
Forces the device through a hardware reset which means it eventually comes alive in the local command
and unconnected mode. This allows changes to the PS store to take effect. Prior to version 2.7.0, allow
for approximately two seconds for the device to once again start responding to AT commands. The best
way to determine if the device is alive is to keep sending it AT<cr> until it responds with an OK response.
After version 2.7.0, it is safe to communicate after receiving an OK.
The optional parameter <n> is only available for firmware 2.7.0 and newer and is a value in the range 0 to
7 (up to version 7.18.0). After version 9.18.6, valid values are 0 to 4 (inclusive).
ATZ and ATZ0 signify reset and emerge into the current mode (see command ATI14 TBC). ATZ1 to ATZ4
instructs the module to reset and then emerge into the appropriate boot mode.
Note: S Reg 103 specifies the boot mode from cold.
For firmware prior to v2.7.0:
Response: <cr,lf>OK<cr,lf>
Note: OK is returned before the RESET.
For firmware v2.7.0 and newer:
Response: <cr,lf>OK<cr,lf>
Note: OK is returned after the RESET.
6.3.18 AT&Fn{Set S Register Defaults}
This command only works when the device is in local command and unconnected mode. Depending on
the value of ‘n’, it installs S Register values appropriate for various power modes, ranging from minimum
power consumption to maximum.
See Table 6-3 for the legal values of ‘n’. All other values of n generate a syntax error response. If ‘n’ is not
specified, then a default value of 0 is assumed where the baud rate is NOT changed.
Table 6-3: Legal values of 'n"
&F0
(Default)
Medium power consumption, UART baud rate unchanged, Left LED off, Right LED =
DCD
&F1
Minimum power consumption, UART baud rate set to 9600, Left and Right LED off
&F2
Minimum power consumption, UART baud rate set to 38400, Left and Right LED off
&F3
Minimum power consumption, UART baud rate set to 115200, Left and Right LED off
&F4
Medium power consumption, UART baud rate set to 115200, Left LED off, Right LED =
DCD
&F5
Maximum power consumption, UART baud rate set to 115200,
Left LED=DSR, Right LED = DCD
&F6
Maximum power consumption, UART baud rate set to 115200,
Left LED=DSR, Right LED = DCD
Explicitly set higher baud rates using ATS521=n