1 March, 2005
V1682OPMA.doc
Page 11 of 32
2.6.2 Display and Switches
The main display is an eight character LED matrix display. It has been set so that when fitted into a
3U rack (V1606) it can be read from the left, and when fitted to a 1U rack (V1601) it is horizontal
and the ‘proper’ way up.
The three buttons are labelled
Select
,
σ
and
τ
. The
Select
button is used to move down and up the
menus. A short press will move down one level, while pressing and holding for about half a second
will move up one level. If you continue to hold it will progressively move up a level every half
second until it reaches the top level (
SLEEP
), or you let go, in which case it will stay where it is.
When at any level the
σ
and
τ
buttons will move through the list of options, or if in an actual variable
they will change the values.
The menu system is described in more detail later in section 3.1.2.
If the unit is in Local control then the display and switches are used to set up and show the
operation the module. If in remote mode then they are still active for showing the status but cannot
be used to actually change anything.
Beside the
σ
and
τ
buttons are three LEDs marked
+
,
CAL
and
–
. In general the
CAL
LED is used
to show that a variable is set to its normalised value and if not then the others show which direction
to which it has been changed or that it is no longer on its CAL value.
2.6.3 Remote/Local Control
The lowest switch selects between Local control and Remote control over DART:
Local
Control is from the front panel itself.
Rem
Control is from the DART system. This requires the use of an external
controller running a suitable programme, which communicates with multiple
racks using the Dartnet protocol.
2.7 AUDIO
I/O
SUB
MODULES
Various audio sub-modules are available for the V1682 depending on the audio requirements.
To change the module remove the V1682 from the chassis and carefully remove the existing one, if
fitted, by lifting evenly at both ends. To fit a new one check the orientation by aligning the offset
connectors and place the module carefully. Push it home evenly at both ends. It may be stiff but do
not force it aggressively since if the connectors are not mating correctly then one or more of the pins
may get bent.
The details of the analogue and digital audio signals are given in Section 2.4.
These are the available modules:
Type Part
No.
Description
AA
130-2920
Analogue Audio In and Out – Both channels
DD
130-2930
Digital Audio In and Out – Both channels
AD
130-2940
Analogue Audio In and Digital Audio Out – Both channels
DA
130-2950
Digital Audio In and Analogue Audio Out – Both channels
HH 130-3090
Hybrid: Channel A – Analogue Audio In and Out
Channel B – Digital Audio In and Out
