I
NSTALLATION
A
IR
HEATER
en-40
en
3. Connect the alarm cable in the unit which is to be to be
connected in series to the TK clamps on terminal X15
1
.
4. Repeat steps 1 to 3 for each unit to be connected in series.
Note:
n
Leave the bridge in place on the final unit
2
.
2.11.4 Connecting the unit to Modbus
Opmerking:
n
A detailed manual for the connection and usageof
ModBus (and possibly BACnet) is available at:
www.biddle.info.
Communication parameters
The Modbus system must comply with the following communi-
cation parameters:
The turnaround time between the unit and Modbus is 4.2
msec.
Wiring
A twisted-pair cable must be used for connection to the Mod-
bus system. The cable must also have a third core for the
GND (grounding). Normally, a four-pole, twisted-pair cable is
used; one pair is used for communication and one core from
the other pair is used as the GND.
COMMUNICATION
PARAMETER
VALUE
Baud rate
9600
DATA
8
Parity
none
Stop bits
1
