3. Installation
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11. Serial interface pattern RS-485/RS-422 for MODBUS RTU network connection or other
protocols. The physical interface choice depends on the cable used.
12. The module is grounded through Nexto Series backplane rack.
13. The power supply comes from the backplane rack connection. There is no need for external
connections.
Ethernet Network Connection
The NET 1 and NET 2 (only for NX3020 and NX3030) isolated communication interface allows the
connection with an Ethernet network, however, the NET 1 interface is the most suitable to be used
for communication with MasterTool IEC XE.
The Ethernet network connection uses twisted pair cables (10/100Base-TX) and the speed detection
is automatically made by the Nexto CPU. This cable must have one of its endings connected to the
interface that is likely to be used and another one to the HUB, switch, microcomputer or other
Ethernet network point.
IP Address
The NET 1 Ethernet interface is used for Ethernet communication and for CPU configuration which
comes with the following default parameters configuration:
Table 3-1. Default Parameters Configuration for Ethernet NET 1 Interface
The IP Address and Subnet Mask parameters can be seen on the CPU graphic display via parameters
menu, as described in Configuration – CPU’s Informative and Configuration Menu chapter.
First, the NET 1 interface must be connected to a PC network with the same subnet mask to
communicate with MasterTool IEC XE, where the network parameters can be modified. For further
information regarding configuration and parameters modifications, see Configuration –Ethernet
Interfaces Configuration chapter.
The NET 2 Ethernet interface, available only in NX3020 and NX3030 CPUs, is used only for
Ethernet communication and comes with the following default parameters configuration:
Table 3-2. Default Parameters Configuration for Ethernet NET 2 Interface
The IP Address and Subnet Mask parameters can be seen on the CPU graphic display via parameters
menu, as described in Configuration – CPU’s Informative and Configuration Menu chapter.
The NET 2 interface parameters can be modified via MasterTool IEC XE. For further information
regarding configuration and parameters modifications, see Configuration – Ethernet Interfaces
Configuration chapter.
Gratuitous ARP
The NETx Ethernet interface promptly sends ARP packets type in broadcast informing its IP and
MAC address for all devices connected to the network. These packets are sent during a new
application download by the MasterTool IEC XE software and in the CPU startup when the
application goes into Run mode.
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General