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7300AENG2.Installation
12/01/06
17:25
Page 2-15
Installation
2.6.5. Digital communication wiring
Supervisor
(Master)
220 Ω
Bus line A
Ground
Communication bus RS485
24 Vac
or
24 Vdc
On the last unit
of the bus
Shield
220 Ω
Bus line B
Fuse
2A
To the next
interface
Auxiliary
supply
ON/
Dxch
Rx
Tx
8
GRF
5
6
7
CHK
SET
4
DLF
HEAT
1
ON
2
3
ON
EN 60947-4-3
24V 0VS GND
19 20 29
x2
A B
91 92
Au
CO
M
ALR
1a 1b
73 74
Protective
earth
Digital communication
block terminal
Auxiliary
supply
Figure 2-17 Digital communication wiring example
7300A user Manual
2-15