User`s manual

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VC-55™ PR Voice Codec Board

User’s Manual

Version 1.3

Section 3 – Set-up & Control

Page 12

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suppression (NS) and silence frame

generation (DTX) in the encoder

4096 Enables Tone Detection.

Audio Options

[l]ine

Sets the audio input source to the

stereo line in Jack J2

-i

Analog Voice Input Source

[h]andset

Sets the audio input source to the

Handset (RJ11) Jack J5

Table 5 vc55param variables

Notes:

1) Changes to EncodeModePinEnable, EncodeMode, SlipMode, ChanRxMinTime, and

ChanRxMaxTime take effect the next frame.

2) Changes to EncodeSource, EncodeCmode, SideTone, ChannelUartRate require Flash

and reset to take effect.

3) To program settings into flash you have to enter the parameters to change along with

the –F option.

Example: To set the baud rate 28,800 into the memory the correct command is

vc55param –c 80 –F

then verify the data by running vc55param (with no command line options) twice (SEE

NOTE BELOW)

vc55param

Once you do this and reset the board it will remain in memory.

NOTE: When running the vc55param program for the first time after a reset or after

applying power, the settings printed out to screen may contain erroneous data.

Therefore, it is always best to run vc55param a couple of times (with no command line

options) before verifying the actual parameter settings as set in flash.

Running the Program

The vc55param is run from a DOS window. Go to the directory that contains the vc55param.exe file

and type in vc55param the program will run and print to screen the current status of the board. The

response will contain the following items:

Parameter Option Name Variable Description

vc55 Status Device=0

This is a device number identification. If two or more VC-55s are

connected to USB ports at the same time then the vc55param

program will write to both devices. This is useful if you want to bulk

load the same parameters or see the settings for all boards.

However, when more than one board is connected to a USB you do

not have individual control of setting different parameters for each