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Section 3: Operation- Bypass Switch Usage (continued)
The second mode (“safe” mode)is used if the CM16a becomes inoperable (or behaves in completely unexpected ways) after
uploading a new application file (TFTP file transfer).
If the CM16a behaves in unexpected ways or is not responding to any communications after a new application file is uploaded to it, then
it is likely that the new application file was corrupted during or after the data transfer. If sent a corrupted application file, the CM16a will
not accept this file. The LED’s might even act in unexpected ways. If this occurs, there is a “backup” file in the CM16a that will enable you
to communicate with it.
The way to put the CM16a into this second BYPASS mode (“safe mode”) is:
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 will now be able to re-establish communications with the CM16a using the RS-232 Input/Output port or the Telnet program in Windows
NT. The following section describes the RS-232 and Telnet features. Once communications 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.
NOTE! Before depressing the BYPASS switch, the gain (volume) settings on all amplifiers
connected to the CM16a should be reduced to a safe level. This is advisable because the
CM16a’s “Level Control” will be reset to 0 dB. (or NO attenuation) with the BYPASS. It is
possible that the amplifiers could be at maximum output level if the amplifier gain controls are
not turned down.
Location of BYPASS switch: The front panel has a small access hole on the right side about 12mm (1/2 inch) 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).
The way to put the CM16a into this first BYPASS mode (“virtual-wire
mode”) is:
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.
FRONT PANEL- BYPASS SWITCH LOCATION