6.9 RS485
Specification
ma_ca_c6-compact3-inst-20372037_en
The RS485 interface is connected via the X5 terminal block. Depending on the
variant, a 12- or 16-pole pluggable terminal block is used.
X5
2
4
6
8
10
1
3
5
7
9
2
4
6
8
10
12
14
1
3
5
7
9
11
13
Tab. 10: Assignment of terminal block X5
The terminals for the RS485 interface are always identical, independent of the
above design.
Fieldbus type
Common-ode voltage range
Transmission speed
Transmission medium
Potential separation
Bus termination
Electrical installation | 6
PIN
Designation Notes
12
1-4
-
5-8
-
9
VCC+5V
10
GND_RS
11
11
RxD/TxD-P
12
RxD/TxD-N RS485 data signal inver-
16
13-16 -
15
RS485 2W
0...12 V to the reference potential.
20, 25, 50, 100, 125, 250 kbit/s; ad-
justable via CN01
Twisted pair
maximum cable length 1200 m depend-
ing on the transmission speed
Functional insulation between terminals
and device potential.
120 Ω external (between RxD/TxD-P
and RxD/TxD-N) at both ends of the bus
cable.
(≡►
Voltage supply
[} 31])
(≡►
CAN
[} 35])
Termination potential for
RS485
Reference potential for
serial interfaces (galvanic-
ally isolated)
RS485 data signal
ted
(≡►
RS232
[} 38]) inter-
face
37
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