Eaton Power Xpert PXR 10, Руководство пользователя

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5 Communication functions
5.1 Integrated Modbus communication module
PXR Electronic trip unit 01/21 MN012005EN www.eaton.com
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5 Communication functions
The circuit breakers with PXR trip units are equipped with a dual
communication interface.
On the one hand, an internal Modbus RTU module can be used. In addition,
an external communication adapter module (CAM) can also be connected in
parallel. In order for the communication function to be enabled, the
communication modules need to be connected via the interface module.
In the case of the PXR25 trip units, the interface module is included as
standard. In the case of the PXR20 trip units, an interface module can be
optionally installed.
5.1 Integrated Modbus communication module
An integrated Modbus communication module is available as an optional
accessory for the PXR20 and PXR25 trip units. This Modbus module also has
to be connected to the interface module. The trip unit will respond to
messages from the Modbus master using the RTU (remote terminal unit)
protocol via an RS485 connection. The Modbus port can be configured using
the display and the navigation keys, or using the Power Xpert Protection
Manager software.
Table 17: Modbus default settings
The trip unit uses Modbus function codes 02, 03, 04, 06, 08, and 16 and
supports up to 122 registers (244 bytes) in a single Modbus transaction.
The integrated Modbus communication module is a CISPR11, class A
equipment.
￫
It is not possible to use an interface module with the PXR10 trip
units.
Default settings
(as delivered) Options
Slave address 002 001 - 247
Baud rate 19,200 bit/s • 9,600 bit/s
• 19,200 bit/s
• 38,400 bit/s
• 57,600 bit/s
Parity even • even
• odd
• no parity
Number of stop bits 1 • 1
• 2
￫
For a detailed overview of all Modbus registers, see
￫ chapter 9, “Modbus RTU – integrated Modbus port
specification”, page 49.