Ethernet Interface - Siemens SENTRON PAC4220 Manual

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2.10
PAC4220
Equipment Manual, L1V30827278B-01

Ethernet interface

The PAC4220 has two identical Ethernet interfaces via which the device can be connected to the
Modbus TCP communication.
The Ethernet interface facilitates communication via the following protocols:
• Modbus TCP
The device can be configured via Modbus TCP.
• Web server (HTTP) 1)
The protocol can only be used to read out the measured values via a web browser.
• SNTP
1)
The SNTP (Simple Network Time Protocol) is used to automatically synchronize the internal
clock with a time server within the network.
• DHCP
Stands for "Dynamic Host Configuration Protocol". Protocol for obtaining network settings
from a DHCP server. Network settings are assigned automatically.
Autonegotiation is a method used by network communication peers to automatically
negotiate the highest possible transmission rate. The PAC4220 is automatically set to the
transmission rate of the communication peer if the latter does not support autonegotiation.
MDI-X autocrossover describes the ability of the interface to autonomously detect the send
and receive lines of the connected device and adjust to them. This prevents malfunctions
resulting from mismatching send and receive lines. Both crossed and uncrossed cables can be
used.
2-port Ethernet switch
PAC4220 offers 2 Ethernet ports that are connected internally via the Ethernet switch. This
supports Ethernet linear topology for efficient cabling, with no additional cost for external
Ethernet switches.
This function will be available at a later time via a firmware update.
1)
Description
2.10 Ethernet interface
35