User guide
MVC 121 • Remote Control
3-7
Command ASCII Command Response Additional description
(host to controller) (controller to host)
Update firmware
Upload firmware
Esc
Upload Go See Note below.
Upload success UPL
See Note below.
Firmware updates will periodically become available on the Extron Web site. To update the firmware, first download the
update file from the site. Then open HyperTerminal and type the
Esc
Upload command. After receiving the Go response,
select Send Text File from the Transfer menu. In the Send Text File window, locate and select the file you downloaded and
click Open. The controller will send the UPL
response once the update has been successfully completed. It will send the
error code E23 if the update failed.
Query software version
Query software version** Q/q
X7
Show the MVC’s firmware version.
System reset
Reset to factory default
Esc
ZXXX Zpx Note: factory default should be as follows:
Master output volume:
X1
= 50 (-30 dB).
All input volume:
X5
= 0 dB.
Gain/volume adjustment note:
All front panel gain/volume adjustments are in 0.5 dB increments whenever the knobs are turned
slowly. However, the SIS messages (RS-232) that the MVC sends to the host are in 1 dB
increments only. The MVC treats each 0.5 dB gain/volume increment between two consecutive
whole dB units as the lower of the two units. As shown in the table examples, in a continuous
adjustment sequence, the SIS messages to the host will send the same value twice.
Volume
Change
SIS Message
to Host
51.0
51.5
52.0
52.5
53.0
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Vol 51
Vol 51
Vol 52
Vol 52
Vol 53