Terminal resistor
For smooth data exchange between the controllers, a
resistance of 120 Ohm must be set on the first and last
subscriber, remove the resistances in the other devices
(if available).
Installation location of terminal resistor Fig. 24, Fig. 25
Master devices - Terminal block X2, terminals 1 and 2
Slave devices - Terminal block X1, terminals 1 and 2
Information on network connection
Fig. 26: Wiring
All network connections via shielded cables.
Note:
For A- and B+, use a twisted pair
①
!
Recommended network cable (by others):
e.g. Uni-
tronic BUS LD 2 x 2 x 0.25 mm² or equivalent
4.7.2 Connection to the central building
management system (central BMS)
FSL-CONTROL III control supports the following com-
munication protocols:
Modbus RTU
Modbus TCP
BACnet MS/TP
BACnet/IP
We recommend connecting all master devices to the
central building management system. Slave devices
can also be connected to the central building man-
agement system if the wiring is structured, i.e.
Modbus TCP or BACnet IP.
Central BMS to master device with Modbus TCP /
BACnet IP
Fig. 27: Connection of central BMS to master device
with Modbus TCP / BACnet IP
1
Network cable at least Cat. 5e with connector RJ45
(by others)
2
Interface X7 in terminal box
Central BMS to master device with Modbus RTU /
BACnet MS/TP
X1
RS 485
4 (SH)
3 (GS)
2 (B +)
1 (A -)
SH
B +
GS
A -
SH
B +
A -
GS
1
1
2
3
Fig. 28: Connection of central BMS to master device
with Modbus RTU
1
Network cable Unitronic BUS LD 2 x 2 x 0.22 (or
equivalent, by others)
2
(coming) from the central building management
system
3
(going) to the next BUS subscriber of the central
BMS
Count up the terminal position from the grey end
plate (direction of the arrow)
Recommended network cable (by others):
e.g. Uni-
tronic BUS LD 2 x 2 x 0.25 mm² or equivalent,
Note:
for A- und B+ always use a twisted pair
Installation
Communication FSL-CONTROL III > Connection to the central building management ...
Decentralised ventilation units Under sill units
27
