Mac Addressing - TR-Electronic 65 Serie Gesamt-Bedienungsanleitung

3.1.4 MAC Addressing

An EPL node must support Unicast, Multicast and Broadcast Ethernet MAC
addressing in accordance with IEEE802.3.
MAC Unicast
The high-order bit of the MAC address is 0 for ordinary addresses (unicast). The
unicast addresses used for EPL are unique within the EPL segment.
MAC Multicast
For group addresses the high-order bit of the MAC address is 1. Group addresses
allow multiple nodes to listen to a single address. When a frame is sent to a group
address, all the nodes registered for this group address receive it. Sending to a group
of nodes is called multicast.
MAC Broadcast
The EPL broadcast address possesses the value 0xFF, messages with this address
are sent to all nodes in the network.
Frame
Start of Cycle, SoC
PollRequest, PReq
PollResponse, PRes
Start of Asynchronous, SoA
AsynchronousSend, ASnd
non EPL
Table 1: Physical addressing of EPL frames
Printed in the Federal Republic of Germany
06/26/2017
Type Address
Multicast 01-11-1E-00-00-01
Unicast xx-xx-xx-xx-xx-xx
Multicast 01-11-1E-00-00-02
Multicast 01-11-1E-00-00-03
Unicast /
Multicast / 01-11-1E-00-00-04
Broadcast
Unicast xx-xx-xx-xx-xx-xx
TR - ECE - BA - DGB - 0071 - 05
Comment
Start of cyclic data exchange.
Inquiry of the MN to the CN in the
EPL cycle. Transmission of
isochronous data.
Response of the CN to PReq.
Transmission of isochronous data.
Start of acyclic data exchange.
Response of the inquired CN in
acyclic data exchange.
Standard Ethernet communication
in acyclic data exchange.
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