EXCEL 50 INSTALLATION INSTRUCTIONS
EN1B-0101
24
Table 18 summarizes cable types and gives selection
guidance. Note that baud rate and maximum 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. Ordering No. for Repeaters.
Description
US
Ordering No.
European
Ordering No.
without housing
14507324-001
-
with housing
14507324-002
XD 509
C-Bus Connection Procedure
1.
Choose a suitable C-Bus cable from Table 18.
IMPORTANT
Make sure that all bus devices connected to the
same C-Bus are set to the same baud rate otherwise
proper communication cannot be ensured.
2.
Set the DIP switch according to Table 17.
IMPORTANT
The C-Bus must be connected through the individual
controllers (open ring). Star connection is not per-
mitted because uncontrollable line reflections could
occur.
3.
Connect the cable shield to C-Bus terminal 4 (Fig. 45).
4.
Connect the C+ cable to C-Bus terminal 5 (Fig. 45).
5.
Connect the C- cable to C-Bus terminal 6 (Fig. 45).
6.
If the maximum C-Bus length for the chosen cable
(Table 18) is exceeded:
— Use repeaters to extend to the maximum C-Bus
length (see section "C-Bus Extension by Using
Repeaters").
It may take up to two minutes to re-initialize the bus when
adding or removing a controller to/from the C-Bus. During
this time, communication on the C-Bus is lost.
