1.
Strip the insulation from the bus cable (at least
two wires), insert the bare wires into the terminals
and tighten the screws by hand.
Make sure that the polarity of the conductor pairs
is correct. Incorrect polarity will result in inverted
data signals and hence communication errors.
2.
Fix the bus cables to the casing using the wire
clamping bracket.
3.
Connect the shield to the SH terminals.
Note:
Within a chain (channel) connect the shield
only at one point to the earth. Earthing the shield
at every controller will lead to voltage distur-
bances.
4.
To avoid cable reflections, network segments must
be terminated at both ends with 120 Ω bus ter-
minal resistors. Alternatively, the terminal resistors
can be enabled or disabled on the PCB.
Recommended bus cables
Twisted Pair, e.g. JY(St)Y 2 × 2 × 0.8 (use only twisted
pair for B+ and A-)
Hardware configuration
Before you use a BACnet MS/TP or Modbus RTU inter-
face card, you have to configure it to the actual applica-
tion. To do so, use the switches on the interface card.
Fig. 13: BACnet MS/TP or Modbus RTU interface card
①
Slide switch for setting the protocol type
②
Rotary switch for setting the network address
③
DIP switch for setting the communication parame-
ters
④
BUSY-LED (green): On = supply voltage OK,
blinking = communication in progress
⑤
ERROR-LED (red): On = communication error
Setting the protocol type
Use the slide switch (Fig. 13/1) to set the BACnet
MS/TP or Modbus RTU protocol.
Setting the network address
Use the two address code switches X and Y (Fig. 13/2)
to set a network address (01 to 99). Address 00 is
reserved for broadcast mode. A maximum of 32 control-
lers (network addresses) can be operated on one net-
work segment. Each device requires a different network
address.
Transmission speed (EIA-485)
BACnet
Modbus
S2
S3
9600 Bd
9600 Bd
Off
Off
19200 Bd
19200 Bd
On
Off
38400 Bd
38400 Bd
Off
On
76800 Bd
57600 Bd
On
On
Parity
Parity
S5
S6
None
Off
Off
None
On
Off
Odd
Off
On
Even
On
On
Terminal resistor for EIA-485 network
Terminal resistor
S8
Disabled
Off
Enabled
On
Commissioning
Personnel:
Network administrator
Configuration of data points depending on pro-
tocol type
BACnet
-
Ä
Chapter 5.2 ‘BACnet MS/TP
interface’ on page 57
Modbus RTU -
Ä
Chapter 5.3 ‘ Modbus RTU
interface’ on page 65
Making electrical connections
FSL-CONTROL II communication > Network with several control zones
Single room control system FSL
‑
CONTROL II
15