Kenwood NX-5000 Series Common Function Reference page 290

16 MULTI RF DECK/ MULTI CONTROL HEAD
16.4 Configuring the Initial Configuration
Data communication of Control Heads and RF Decks occurs by using CAN. According to the High Speed CAN standards,
a 120 ohm termination is required for CAN. The following figure is a block diagram of CAN communication between a Control
Head and an RF Deck:
C ontrol H ead Side
(KC H-20R or KR K-14H)
R XD
CPU
T XD
Because the Control Head is always the terminal, the terminal does not need to be considered if a Dual Control Head
structure. If an RF Deck is the terminal, configure On the configuration of SW1 of the RF Deck. As the information to
determine that an RF Deck is the terminal, if only one of the connectors to which KCT-71 implemented on KRK-15B is
connected is used, the RF Deck to which the KRK-15B is connected is the terminal.
For Dual RF Deck/ Single Control Head, KRK-15B to be connected to RF Deck 2 is the terminal. For Triple RF Deck/ Single
Control Head, KRK-15B to be connected to RF Deck 3 is the terminal.
120ohm
Termination
Note
For a Single Control Head structure, the DIP switch configuration of the Control Head needs to be the Control Head 1
0
configuration. If the DIP switch configuration is the Control Head 2 configuration, the system may not start up properly.
For a Single Control Head structure, only Control Head 1 exists as a Head.
For a Multi RF Deck system, the DIP switch with the RF Deck 1 configuration is always required in the system. For
0
example, for a Dual RF Deck structure, the configurations of the DIP switches consist of the RF Deck 2 configuration and
the RF Deck 3 configuration, the system may not behave properly.
If CAN is not terminated, the LCD may not display and key operations may be disabled because the waveform of the data
0
flowing through the CAN bus line is collapsed. To make CAN communication properly, CAN must be terminated in a 120
ohm resistor in the RF Deck configured as the terminal.
Common FUNC (K, F)/Ver 2.20
C AN+
CAN
C AN BU S
Transceiver
C AN-
Figure 16-16 Block Diagram of CAN Communication
RF Deck RF Deck
(N X-5*00) (N X-5*00)
KRK-15B KRK-15B
Featured
Panel
(KCH-20R)
Figure 16-17 Triple RF Deck/ Single Control Head
R F D eck Side
(KR K-15B)
SW1
T XD
CAN
CPU
Transceiver
R XD
RF Deck
(N X-5*00)
120ohm
Termination
KRK-15B
CONTENTS INDEX
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