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Basics
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Echochange - Manual / Basics
To specify whether to create the log in the RAM only or to also save it to a file, click Settings in the
Logger dialog box.
4.3 ARP
The Address Resolution Protocol (ARP) is a network protocol which allows mapping network
addresses to hardware addresses.
To map an IP address to a MAC address, an ARP request is used. After encapsulating this request
in a frame, it is sent out as a broadcast. All stations in the network receive and evaluate this request.
They compare the IP address submitted in the ARP request with their own IP address. The station
whose the IP address matches the one in the request replies by sending an ARP response.
The response is sent specifically to the station which had sent out the request, it contains the
requested MAC address.
The MAC address is added to an ARP cache along with the associated IP address. The ARP cache
is a temporary memory which is part of the respective station's RAM. Each time another IP address
needs to be resolved to a MAC address, the station first checks whether it can do so using the ARP
cache and thus without sending a new ARP request. If this is not possible, it sends an ARP request.
Thus, ARP resolution is advantageous as it saves time and reduces the network load.
If an entry in the ARP cache is not accessed for a certain period of time, it will be removed. This
behavior ensures that changes in the network can be detected and reflected by sending new ARP
requests.
See also: ARP Cache Stati
4.4 PC-H1 Driver
To configure the echo devices via H1, you need the H1 driver (INAT H1 ISO protocol). This driver is
installed with the software and is available for NetCon.
If the PC has multiple network adapters installed, the H1 driver should only be bound to the network
adapter used for configuration.
A detailed description is included in the PC-H1 program folder.
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