Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 562)

Audio Commands
Loudspeaker Volume Level +CLVL
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WM_DEV_OAT_UGD_049 - 001 VOLUME 4 August 23, 2007
21.4 Loudspeaker Volume Level +CLVL
21.4.1 Description
This command is used by the application to tune the loudspeaker volume level.
21.4.2 Syntax
Action command
AT+CLVL=<Volume>
OK
Read command
AT+CLVL?
+CLVL: <Volume>
OK
Test command
AT+CLVL=?
+CLVL: (list of supported <Volume>s)
OK
21.4.3 Parameters and Defined Values
<Volume>:
volume level
range : 0-12 (default value: 6)
21.4.4 Parameter Storage
The <Volume> parameter is stored in EEPROM using the AT&W command. The
default value can be restored using AT&F and AT+VIP=1.