Eaton XV300 - Serial Interfaces; COM2 RS-485 Communication

5. External connections
5.5 Serial interfaces for communication with PLCs or devices
5.5.2 COM2 RS-485
The RS485- interface is not electrically isolated.
CAUTION
NON-GALVANICALLY-ISOLATED INTERFACES
The XV300 may be damaged by potential differences.
The GND terminals of all bus modules must be connected.
Do not connect the connector to the XV300 or disconnect it without
first de-energizing the system.
SUB-D plug PIN signal Meaning
9 pole
1
2
3
4
5
6
9
8
7
1
n.c.
not used
2
n.c.
not used
3
B
Line B
4
n.c.
not used
5
GND
Ground
6
5 V
Output for external bus termination
7
A
A cable
8
n.c.
not used
9
n.c.
not used
Plug housings
GND
Functional earthing
Table 16: Pin assignment COM2 RS-485, not galvanically isolated, SUB-D plug 9-pole, UNC nuts for interlocking
n.c.: PIN 1, 2, 4, 8 and 9 must not be connected.
PIN 6 (5 V) must not be used as a power supply for external devices.
5.5.2.1 Wiring
l Screened twisted-pair cables must be used.
l The maximal baud rate depends on the cable length
Rated surge impedance
120 Ohm
Permissible surge impedance
108 … 132 Ohm
Max. cable length
1200 m
Possible baud rates
9600 Bit/s

19200 Bit/s

38400 Bit/s

57600 Bit/s

115200 Bit/s
Table 17: Specifications for RS-485 wiring
When preparing connections, ensure that the cable shield has a low
impedance connection with the connector housing.
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XV30004/19 MN048017ENwww.eaton.eu