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 resistors in the other devices (if
available).
Installation location of terminal resistor Fig. 35 , Fig. 36
Master devices - Terminal block X2, terminals 1 and 2
Slave devices - Terminal block X1, terminals 1 and 2
Details on network connection
SH
A-
B+
GS
①
Fig. 37: Wiring
All network connections via shielded cables.
Attention:
For A- and B+, use a twisted pair
①
!
Recommended network cable (by others):
e.g., Uni-
tronic BUS LD 2 x 2 x 0.22 mm² or equivalent
6.4.5.2
Connection to building automa-
tion/machine control device (BAS/MCD)
FSL-CONTROL III control supports the following com-
munication protocols:
Modbus RTU
Modbus TCP
BACnet MS/TP
BACnet/IP
We recommend the connection of all master devices
to the building automation/machine control device
(BAS/MCD). Slave devices can also be connected
to the building automation/machine control device if
the wiring is structured, i.e., Modbus TCP or BACnet
IP.
BAS/MCD to master device with Modbus TCP/
BACnet IP
X7
RJ 45
②
①
Fig. 38: Connection of BAS/MCD 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
BAS/MCD 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. 39: Connection of BAS/MCD to master device with
Modbus RTU
1
Network cable Unitronic BUS LD 2 x 2 x 0.22 (or
equivalent, by others)
2
(Incoming) from building automation/machine con-
trol device
3
(Outgoing) to next bus node of building automa-
tion/machine control device (BAS/MCD)
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 0.22 mm² or equivalent,
Note:
for A- und B+ always use a twisted pair
Installation
Making electrical connections > Communication FSL-CONTROL III
Decentralised ventilation units SCHOOLAIR-S-HV
28
