C8000
Frame Controller
C8702
digital audio
modular
processing system
Page 4/23
Connector pin assignments
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.
Important Note!
Junger Audio uses a default bit rate of 125 kbit/s and guarantees
cable lengths
of up to
300m
if one connects a brc (broadcast remote controller). As an exeption for high density application with
C8942 and C8912 compact frames and C8491, C8492 and C8492(B) compact modules, the internal CAN
bus
may
operate with 1Mbit/s. In this case it is
not
possible to use brc controllers!
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. The frame controller does not
support multiple frames anymore.
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. A decision must be taken how to deal with 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 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 turned
off
and
termination must be turned
on
on the
brc 8x
panel.
RJ45
LAN
Pin #
Function
1
Tx +
2
Tx -
3
Rx +
4
5
6
Rx -
7
8
RJ45
CAN
Pin #
Function
1
CAN-H
2
CAN-L
3
4
GND
5
GND
6
7
8
D-Sub
RS232
Pin #
Function
1
DCD
2
Tx D
3
Rx D
4
DTR
5
GND
6
DSR
7
CTS
8
RTS
9
N.C.