US Robotics 56K USB Modem User Manual page 85

Table 176. +VGM Extended Syntax Commands
Command
+VGM=<gain>
+VGM?
+VGM=?
+VGR=<gain>—Receive Gain Selection
Use this command to set the receive microphone gain control. The receive gain has a range of 0—255.
However, the values are only significant between 121 and 134. Any value set below 121 uses the same
gain as 121. And any value set above 134 uses the same gain as 134.
Note: While in TAD mode, this command may be used in TAD local recording to control the recording level
from the microphone. While in speakerphone mode, this command controls the gain to the remote
caller.
Result codes:
• Default: manufacturer-specific.
• OK if <gain> = 0—255.
ERROR if <gain> ≠ 0—255.
•
Table 177. <gain> Values
Command
<gain> = 128
<gain> = a value greater than 128
<gain> = a value less than 128
Table 178. +VGR Extended Syntax Commands
Command
+VGR = <level>
+VGR?
+VGR=?
+VGS=<gain>—Speaker Gain
Use this command to set the speaker gain of the speakerphone function. <gain> is an unsigned octet
where values greater than 128 indicate a gain larger than nominal, and values smaller than 128 indicate a
gain smaller than nominal. The speaker gain control has a range from 0 to 255.
Result codes:
• Default: 128.
• OK if <gain> = 0—255.
ERROR if <gain> ≠ 0—255.
•
Sets the microphone gain level.
Displays the current gain level.
Displays the supported speaker gain levels for the product.
Nominal level for receive gain from microphone (default).
Increases gain above nominal level.
Decreases gain below nominal level.
Sets the microphone receive gain.
Displays the current value of receive gain.
Displays the range of supported gain values.
Function
Function
Function
Command Reference - 79
56K USB Modem
User Guide