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Revision 1 2017
CDC seven
Connecting the hardware
Power supplies – control surface
The external CDC PSU 4800 power supply (or supplies) for the control surface
should be connected using the supplied cable(s). Two 12-pin Jaeger connectors
are fitted to the rear of the surface master section. If only one PSU is being used,
either connector may be used.
Power supplies – remote stageboxes
Each remote stagebox has an internal power supply. Connect the rack to AC
mains via the supplied IEC cable. The internal power supply is a ‘Universal’ type,
and will operate on any AC mains voltage between 100 and 240 V, 50/60 Hz.
The CDC I/O 6448 rack may have a second (redundant) power supply
(CDC PSU 4800); this is connected to the dedicated AUX POWER connector on
the rear panel. Note that there is no provision for a redundant power supply on
the CDC I/O 3216 remote stagebox.
Data communications: MegaCOMMS
Cadac’s proprietary MegaCOMMS hi-speed data protocol is used to interconnect
the CDC seven’s control surface and stage rack(s). The control surface and
each stagebox each have four BNC sockets to provide the main system data
interconnection, labelled TX A, RX A, TX B and RX B.
BOOT
SWITCH
Port A
Port B
Tx
Rx
Rx
Tx
+
-
+
+
18V
FPGA stat0
18V
FPGA stat1
48V
PIC stat0
12V
Spare
USB
Port A Tx
Port B Tx
Port A Rx
Port B Rx
REPLACE ONLY WITH SPECIFIED
TYPE AND RATED FUSE
TO PREVENT ELECTRIC SHOCK
UNPLUG UNIT FROM AC MAINS SUPPLY
BEFORE REMOVING PANEL
AUX PWR
C
S
B
R
0 9
8
7
6
5
4
3
2
1
Designed and Engineered in En
CDC I/O 6448
CDC I/O 3216
CDC seven
The two paths A and B carry identical and synchronous data, and can be used
in various ways, depending whether system redundancy is required. Providing
a redundant path gives greater system robustness, as the CDC seven will
