QSC Audio Amplifier Network Monitor CM16a - Manual (Page 26)

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Section 3:
Operation- Bypass Modes and Switch Location
BYPASS MODE #2 (SAFE MODE): Use if the CM16a becomes inoperable (or behaves in completely unexpected ways)
after uploading a new application file (TFTP file transfer).
If the CM16a operates in an unexpected way or is not responding to any communications after a new application file is uploaded
to it, it is likely the file was corrupted during transfer. If this occurs, there is a “backup” program in the CM16a that will enable you
to communicate with it.
NOTE! Before depressing the BYPASS switch, the gain settings on all amplifiers connected to the
CM16a must be reduced to a safe level. This is because the CM16a’s “Level Control” will be reset
to 0 dB with the BYPASS. Amplifiers could be at maximum output level if the amplifier gain controls
are not turned down.
BYPASS MODE #1 (“virtual-wire”mode): Use this mode if you need the CM16a to behave as a virtual wire. This BYPASS
mode routes all audio straight through with 1Vrms input sensitivity, PAGE input disabled, MUTE disabled, 0 dB level, and normal
polarity. All amplifier control states are set to “on”. Audio passes through the CM16a regardless of network/computer issues.
Location of BYPASS switch: The front panel has a small
access hole on the right side about 12mm (1/2”) to the right from
the PORT H LED. It is NOT LABELED to help prevent accidental
use. This is the BYPASS mode switch. To return to normal
operation, simply reestablish computer communications via the
network or RS-232 and change the appropriate settings (or recall
a previously saved Preset). After completeion of a successful
TFTP file transfer/code re-program cyclefrom the safe mode, the
CM16a will automatically restart in the normal mode of opera-
tion.
HOW TO put the CM16a into BYPASS MODE #1:
1- Turn the CM16a on and wait 5 to 10 seconds for the start-up LED sequence to finish.
2- Depress the BYPASS switch (use a paperclip or similar item) and keep it depressed for at least 5 seconds.
3- The two steps above must be completed within 60 seconds from power-up. If you miss the timing, just power-down and
power-up again and repeat steps 1 & 2.
HOW TO put the CM16a into BYPASS MODE #2:
1- Turn off the power to the CM16a using the front panel power switch.
2- Depress the BYPASS switch (use a paperclip or similar item) and keep it depressed while turning the power on again.
3- The CM16a is now in “safe mode”. You may release the BYPASS switch.
You will now be able to re-establish Ethernet communications with the CM16a. Once communication has been re-
established, the file transfer can be tried again or the old application file used until the source of the data transfer problem
can be found. In safe mode, all connected amplifiers are forced to the standby state, and all audio paths are muted. Also,
no QSControl communication is possible, only TFTP or Telnet, or RS-232.