Grass Valley SMS-6000 Series - Manual (Page 26)

1-9
Control System
DIP Switches
There are four positions available on the DIP switch at the front of the
crosspoint modules. They operate in the same way for video and audio
crosspoint modules. Refer toTable 1-1 for the correct settings of the DIP
switch for either a master frame or a slave frame.
Control Bus Quick-Link
The Quick-Link used to interconnect the panels and frames uses a single
coaxial cable.
The Quick-Link is daisy-chained from one panel to the next and between
the frames. Messages are sent by injecting signal currents onto the link, to
be received by all the other panels or frames on the line. The link is
terminated with 75
Ω
at both ends.
A hex switch in each frame and panel sets the identity of each so that they
are correctly addressed by the control system. Up to 16 panels and 16
frames can be supported. Local control panels can be optionally mounted
on any 1RU frame (except 32 x 32 AES/EBU 1RU frame) to increase total
panel count to 32.
Two BNC sockets are provided on the frames fed from a single driver/
receiver. Thus short lengths of coax cable can be used to interconnect the
frames in a multi-frame system by looping through the frames. The panels
use one BNC connector and a T-piece to tap off the Quick-Link into the
panels. In this way a panel can be removed from service without the Quick-
Link being interrupted, even momentarily.
A total run of 500 meters (1641 ft.) of video cable can be used between
panels and the frames.
As part of the fault diagnosis system, detectors are provided in the frame
and panels to identify faults. If either one or both terminations has been
omitted or if the cable is too loose and risks communication errors then
these are highlighted by the control system with LEDs on the front of the
router module. These features are very useful at installation as it enables
the cable and its terminations to be verified.
Table 1-1. Dip Switch Settings
DIP Switch Position Master Frame Slave Frame
1 UP UP
2 DOWN UP
3 DOWN UP
4 UP UP