RJ12 Screw terminals
1
2
3
4
5
6
+24 V
GND (earth)
Bus „B“
Bus „A“
+24 V
GND (earth)
CH1
CH2
RS485 MODBUS
RS485 MODBUS
Bus “A
”
Bus “B
”
+24V
GN
D
+24V out
N.C.
GN
D
+24V out
N.C.
GN
D
6
1
6 .. 1
Illus. 6: Connecting Modbus via the
screw terminals
B E T R I E B S - U N D M O N T A G E A N L E I T U N G S Y S T E M V E N T E C H L G 1 4 0 0 ( S ) - L G 3 2 0 0 ( S )
5.2.9 Modbus screw terminals
Connect the Modbus cable to the Modbus port for a hand terminal on the PI Air2
Master and to the corresponding screw terminals on the PI-HMI (see illus. 6).
5.2.7 Modbus connection
PI-HMI is connected to the PI Air2 Master by means of a Modbus cable. The Modbus cable can be
connected to the PI-HMI by means of the RJ12 6P4C port or four single-wire screw terminals. Whether the
RJ12 6P4C port or screw terminals are used does not influence the available functions or operation.
5.2.8 Modbus RJ12 6P4C
Connect the Modbus cable to the Modbus port for a hand
terminal on the PI Air2 Master and to the RJ12 6P4C
port on the PI-HMI (see illus. 5).
CH1
CH2
RS485 MODBU
S
RS485 MODBUS
Bus “A
”
Bus “B
”
+24
V
GN
D
N.C.
+24
V
ou
t
GN
D
+24V ou
t
N.C.
GN
D
Illus. 5: Connecting Modbus via the
RJ12 6P4C port
O P E R A T I N G A N D I N S T A L L A T I O N I N S T R U C T I O N S L G
7 5 0 - L G 6 0 0 0
P A G E
3 3
