Specifications

6/18/2009 7
3.2.2 Checking recording buffer state
The recording buffer is an on-board memory that holds enough samples for compensating for
the periodically slower CF card.
With some CF cards and, in particular, in 24 bits mode there may be risqué for buffer overrun.
To see the buffer status, press both keys >> >> and << << while in recording mode.
The bar graph will show a low level for a good state and a higher level for buffer problem.
In case of buffer overrun recording mode is cancelled.
3.3 Setting the internal clock
There are a few steps to perform in order to set the clock.
1. Download the most suitable Windows or Mac driver for the USB COM port from
http://www.ftdichip.com/Drivers/VCP.htm and unzip the files to a separate folder.
2. Power on MM-4220.
IMPORTANT! Power on the mixer before connecting the USB cable. Also, remove
the CF card, if one is inserted!
3. Connect a USB cable between the PC and MM-4220. Avoid using a USB hub; a
direct USB socket is preferred.
4. The ‘found new hardware’ wizard starts. Follow the on-screen instructions, pointing
the wizard to the folder where the unzipped driver files are located. If a window
appears with a note about the driver not being verified, agree to install anyway.
5. When done a message will show up indicating that the driver for a USB serial
converter has been installed.
6. To see what COM port number has been assigned to the USB COM port, look into
the Control Panel / Hardware Devices / Ports.
7. Use terminal software of your choice. An example is Tera Term, available for free
from http://www.ayera.com/teraterm/.
8. Run the terminal software and make sure to select the COM port that was previously
indicated to be used for the MM-4220 connection.
Communication parameters are 9600, N, 8, 1.
9. Hit <Enter>. A short menu will show up:
T Set time
D Set date
R Recording resolution
C Time code (Only for MM-4220TC)
Q Quit
10. When done, power off MM-4220 and disconnect the USB cable.