Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 564)

Audio Commands
Loudspeaker Volume Level +CLVL
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WM_DEV_OAT_UGD_049 - 001 VOLUME 4 August 23, 2007
21.4.6 Notes
The value returned by the AT+CLVL? command depends on the current speaker (cf.
+SPEAKER command description).
The following table gives values corresponding to the Wireless CPU ® .
<Volume> Receive gain HFR Receive gain EAR
0 -34 dB -40 dB
1 -30 dB -36 dB
2 -26 dB -32 dB
3 -22 dB -28 dB
4 -18 dB -24 dB
5 -14 dB -20 dB
6 -10 dB -16 dB
7 -6 dB -12 dB
8 -2 dB -8 dB
9 2 dB -4 dB
10 6 dB 0 dB
11 10 dB 4 dB
12 14 dB 8 dB
The gain values listed here are relative. For absolute (electrical) values, please refer to
the specific hardware documentation of the Wireless CPU ® used in the application.
AT+CLVL=<Volume> returns "+CME ERROR: 3" if the current speaker value is
+SPEAKER: 9 (digital speaker).