Honeywell
XAL-Term
EXCEL 500/600 INSTALLATION INSTRUCTIONS
Fig. 80. Termination Module 209541B connections for a
singly-terminated FTT network
3 4
5
shield
1
shield
4
3
0 6
LON
Termination
plug-in
jumper
FTT/LPT Bus
FTT/LPT Free
Park Position
removable screw-type
3-pole terminal block
L L
OO
NN
Fig. 81. XAL-Term
In the case of either a daisy chain or free-topology LONWORKS
bus layout, the maximum lengths described above must be
adhered to.
System Bus (C-Bus) Up to 30 controllers can communicate with one another and a
PC central via the system bus. Instead of an Excel 500/600
controller, other system bus compatible components can also
be connected. (Excel IRC Multicontroller; Excel EMC).
The system bus must be connected through the individual
controllers (open ring).
Fig. 82. C-bus topology
IMPORTANT
Star connection is not permissible because
uncontrollable line reflections may occur.
For setting up the system bus in the right way, three steps
have to be followed:
1. Select submodule for system bus communication
(XC6010, only)
2. Specify cable for system bus.
3. Set up submodule (XC6010), CPU module (XC5010C),
or communication module (XCL5010).
Submodule Selection (XC6010)
Two submodules for system bus communication are
available. The selection depends on the communication
speed.
Table 18. C-Bus submodule baud rates
Submodule Possible baud rates
XD505A 9600 baud
XD508 9600 baud
19200 baud
76800 baud
If the system bus speed throughout the system life-time is
restricted to 9600 baud, then a submodule XD505A should be
chosen. Otherwise, the XD508 must be used.
NOTE: All communication submodules on one bus must be
of the same type, i.e. either uniquely XD505A or
uniquely XD508. Do not use a mix between
submodules XD505A and XD508 on the same bus.
IMPORTANT
For communication with more than 9600 baud it is
required to enable the termination of the first and the
last device on the C-bus (see the following sections).
The controllers with termination must be switched
ON prior to the controllers in the middle of the C-bus.
The C-bus might not work if the controllers with
termination are switched OFF.
The maximum communication speed of the XC5010C /
XCL5010 is 76800 baud. The XC5010C/XCL5010 can be
mounted together with the XC6010 (with XD505A or XD508
submodule) since the XC5010C/XCL5010 communication
speed can be changed to match either submodule.
NOTE: When changing the baud rate of bus devices, proper
communication cannot be ensured until all bus
devices are set to the same baud rate again.
NOTE: When adding or removing a controller to/from the C-
Bus, it may take up to two minutes to re-initialize the
bus. During this time, communication on the C-bus is
lost.
System Bus Cable Specification
The maximum cable length is 4000 ft (1200 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.
37 EN1R-1047GE51 R0902