User's Guide
WCM MKII © RME
5
8. First Operation
After fitting the
WCM
(see 7. Hardware Installation) and switching on the computer, activate
the push button switch 'Test Mode' located between the BNC jacks. Provided the module is
correctly connected to the
DIGI,
the LED beside the switch must light up red. Additional the
green 'Lock' LED must light up, indicating a valid and stable input signal.
When both LEDs do not light up, then the cables between DIGI and WCM are exchanged.
Please switch off the computer immediately and check the cabling!
*
Exchanging the cables at
ST 6/ST 7
will not harm
DIGI
or
WCM
, but should be avoided.
After completed boot of computer
and operating system, start the
DIGI's
Settings dialog and activate
the mode 'Word Clock' in the field
'Clock Mode'. Under 'Output Status'
the third line indicates the state of
the output circuit (master or slave).
It will change to 'Word Clock'. This
display realizes the same functiona-
lity as the green 'Lock' LED besides
the BNC input jack. Therefore you'll
see directly on your screen when a
valid word clock signal is received
and used by the
WCM
.
Now again push the switch 'Test
Mode', so that the red 'Test' and the
green 'Lock' LED extinguish. The
third line now shows 'Clock Master'
or 'Clock Slave' instead of 'Word
Clock'. As no word clock signal is
present at the BNC jack (inactive
'Lock' LED), the card will switch
back to its former operation (slave:
sync to input signal, master: clock
from quartz crystal).
While in word clock mode the
displayed sample frequency in 'Output Status' is not the real sample frequency, but the channel
status of the digital signal.
*
Technical note: The LED VD7, located on the WCM board, indicates whether the WCM gets
the needed 12V from the DIGI96 series board or not. This LED is not visible from the outside. It
is placed before the 5 V voltage regulator, which supplies all of the electronics of the WCM.
