Junger Audio C8702 Controller C8000 - Manual (Page 4)

C8000
Frame Controller
C8702
digital audio
modular
processing system
4/22
set up of the module
The communication with the C8k modules is done via the CAN bus, i.e. the Frame Controller “talks” to
the C8k modules via CAN bus while external applications communicate via TCP/IP over Ethernet with the
C8702. The CAN bus is a simple two-wire differential serial bus, it operates in noisy electrical
environments with a high level of data integrity. Its open architecture and user-definable transmission
medium makes it extremely flexible. Capable of high-speed (1 Mbits/s) data transmission over short
distances (40 m) and low-speed (5 kbits/s) transmissions at lengths of up to 10,000 m, the multi-master
CAN bus is highly fault tolerant, with powerful error detection and handling designed in.
Junger Audio uses a bit rate of 125 kbit/s and guarantees cable lengths of up to 300m.
Very important is the termination of the transmission medium to avoid signal degradation by reflections.
Setting the frame ID of a C8k frame:
• The frame address switches DEV0 – DEV2 must be set to ON
Termination of the CAN bus:
• The CAN bus must be terminated by two 120
Ω resistors on both ends. The frames have one integrated
terminator on the back plane so decision must be taken how to deal wit the second one. You may either
use the Sync interface or the Frame Controller to terminate the bus. If the CAN connector of the C8702
is used for an external remote controller (e.g. the brc), the bus must be terminated on the remote
controller (at the far end).
Important Note! The CAN-TERM switch must be set to OFF if it is terminated on the Sync-Module.
If no Sync-Module is installed (in case of a MADI / SDI or AES interface operates in Master-Mode),
the CAN bus must be terminated by SW2-4. If a brx 8x panel is connected it must be set off and
termination must turned on at the brc 8x panel.
Setting the mode switch for single power supply operation:
• if there is only one power supply installed (e.g. the C8911 frame has only one PS)
the mode switch “B” must be set to ON in order to turn power fail monitoring off.
Setting the mode switch for C8942 high density frames:
• For the C8942 frames the mode switch “C” must be set to ON to turn sync fail monitoring off
(this frame type has no central sync source) and fan monitoring on.
Setting the mode switch for C8912 dual power supply 19" 1RU frames:
• For the C8912 frames the mode switches “C” and "D" must be set to ON to turn fan monitoring on.
Reset the C8702:
• press the INIT button briefly at any time and the Frame Controller will reboot immediately.
Important Note! Rebooting the Frame Controller has no effect on audio processing.
Initialize the C8702 to factory default settings:
• Approx. 10 sec. after power is turned on or after pressing the INIT button briefly (Reset function), the
STATUS LED lights yellow. Now you may press the INIT button and hold it firmly until the
STATUS LED flashes three times. This is an acknowledge that the C8702 has been initialized to factory
default settings (you may also hold down the INIT button at any time until the STATUS LED flashes
three times).