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
9-pole
PIN
Signal
Description
1
n.c.
not assigned
2
n.c.
not assigned
3
B
Cable B
4
n.c.
not assigned
5
GND
Ground
6
5 V
Output for external bus termination
7
A
A cable
8
n.c.
not assigned
9
n.c.
not assigned
Plug housings
GND
Functional earthing
Table 14: 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.
Rated cable impedance
120 Ohm
Permissible 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 15: Specifications for RS-485 wiring
When preparing connections, ensure that the cable shield has a low
impedance connection with the connector housing.
XV300
12/15 MN048017 EN www.eaton.eu
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Содержание XV300 Series
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