Motherboard Design Guide
Requirements for Components of Third-party Suppliers
EPOS4 EtherCAT Card Hardware Reference
4-22 CCMC | 2019-11 | rel8613
4.2.5 EtherCAT Connectors
The «EPOS4 EtherCAT Card» provides both transmission and receive signals for input as well as output for
an EtherCAT interface. Unused connections of the EtherCAT IN/OUT connectors (pins 4, 5, 7, and 8) must
be connected through to the PCIe plug-in contact.
In respect to short-term signal transmission and propagation times, sufficient short conducting paths and
isolation spacing must be provided.
Wrong plugging may cause hardware damage
Even though both sockets are prepared for identical external wiring, make sure to always connect them as
follows.
• Use only standard Cat5 cables with RJ45 plug, such as maxon’s «Ethernet Cable» (422827).
• Use EtherCAT IN as «Input».
• Use EtherCAT OUT as «Output».
For detailed information
separate document «EPOS4 Communication Guide».
For detailed information
separate document «EPOS4 Communication Guide».
Figure 4-10 EtherCAT connector
Table 4-11 EtherCAT interface specification
Table 4-12 EtherCAT connectors – Pin assignment
Continued on next page.
EtherCAT
EtherCAT Standard IEEE 802.3 100 Base Tx
Max. bit rate 100 Mbit/s (full duplex)
Pin Signal Description
1 TX+ Transmission Data+
2 TX− Transmission Data−
3 RX+ Receive Data+
4 TXCT not applicable
5 TXCT not applicable
6 RX− Receive Data−
7 RXCT not applicable
8 RXCT not applicable
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