EXCEL 50 INSTALLATION INSTRUCTIONS
EN1B-0101GE51 R1105D 20
C-Bus
C-BUS
LEDs
SHIELD
C +
C -
C-BUS TxD, YEL
POWER, GRN
C-BUS RxD, YEL
RESERVED
RESERVED
C-BUS
TERMINATION
SWITCH
0000060c
45
6
Fig. 37. C-Bus connection and LEDs
Up to 30 controllers can communicate with one another and
the Excel Building Supervisor PC (XBS) via the C-Bus.
Instead of an Excel 500/600 Controller, other C-Bus-
compatible components can also be connected (Excel IRC
Multicontroller; Excel EMC; Modem Device XM 100A).
C-Bus Termination
Fig. 38. DIP Switch settings for C-bus
The application module is equipped with a DIP switch for the
C-Bus to set the bus termination appropriate for the com-
munication speed.
Table 17. DIP switch settings for C-bus termination
DIP switch
setting
communication
speed (max.)
controller
location
compati-
bility
up 9.6 Kbaud -
XD505A,
XL20XD
middle 76.8 Kbaud middle of bus
XD508,
XL20XD508
down 76.8 Kbaud
beginning or
end of bus
XD508,
XL20XD508
NOTE: Modules listed in Compatibility column are used in
Excel 20/100B/500/600 Controllers.
NOTE: The controllers with the termination must be switched
ON prior to the controllers in the middle of the C-Bus.
The C-Bus may not work if the controllers with
termination are switched OFF.
Cable Specification
The max. cable length is 4,000 ft (1,200 m). There are
regional differences as to whether shielded or unshielded
cable must/can be used.
IMPORTANT
In Europe, only shielded cable is permitted while in
the US, shielded or unshielded cable can be used.
Inside the cabinet: J-Y-(ST)Y 2 x 2 x 0.8
Outside the cabinet: A-Y-(ST) 2 x 2 x 0.8
In principle, data transmitting cables should be shielded in
case of RFI.
Table 18 summarizes cable types and gives selection
guidance. Note that baud rate and max. bus length are
related to each other.
Table 18. C-Bus cable types
cable type description recommended for
J-Y-(ST)Y
2 x 2 x 0.8
shielded,
twisted pair
Europe
Inside cabinet
A-Y-(ST)Y
2 x 2 x 0.8
shielded,
twisted pair
Europe
Outside cabinet
AK 3702
unshielded,
twisted pair
US
not approved for Europe
AK 3740A shielded
US (low-cost)
not approved for Europe
Belden 9842 twisted pair
Europe
US also possible
Belden 9841 shielded US
AK 3702
unshielded,
twisted pair
US
not approved for Europe
AK 3740A shielded
US (low-cost)
not approved for Europe
Each end of the shield on the C-Bus should be connected to
the shield terminal of the respective device. Do not connect it
to the cabinet ground or any other ground points.
C-Bus Extension by Using Repeaters
The C-Bus length can be extended by using repeaters. Each
repeater extends the bus length by 4,000 ft (1,200 m).
For the US the repeater is available either with or without
housing. In Europe, only the version with housing is allowed.
Table 19. Order no. for repeaters
description US order no. European order no.
without housing 14507324-001 -
with housing 14507324-002 XD 509
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