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EBUS/LVDS Physical Layer

Slave Controller – Technology I-35

6 EBUS/LVDS Physical Layer

EBUS is an EtherCAT Physical Layer designed to reduce components and costs. It also reduces

delay inside the ESC. The EBUS physical layer uses Low Voltage Differential Signaling (LVDS)

according to the ANSI/TIA/EIA-644 “Electrical Characteristics of Low Voltage Differential Signaling

(LVDS) Interface Circuits” standard.

EBUS has a data rate of 100 Mbit/s to accomplish the Fast Ethernet data rate. The EBUS protocol

simply encapsulates Ethernet Frames, thus EBUS can carry any Ethernet frame – not only EtherCAT

frames.

EBUS is intended to be used as a backplane bus, it is not qualified for wire connections.

6.1 Interface

Two LVDS signal pairs per EBUS link are used, one for reception and one for transmission of

Ethernet/EtherCAT frames.

The EBUS interface has the following signals:

EtherCAT

device

EBUS-TX-

EBUS-TX+

EBUS-RX+

EBUS-RX-

RBIAS

Figure 16: EBUS Interface Signals

Table 20: EBUS Interface signals

Signal

Direction

Description

EBUS-TX+

EBUS-TX-

OUT

EBUS/LVDS transmit signals

EBUS-RX+

EBUS-RX-

EBUS/LVDS receive signals

RBIAS

BIAS resistor for EBUS-TX current adjustment

Unused EBUS ports can be left unconnected, only the LVDS termination resistor and the RBIAS

resistor are mandatory.

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Beckhoff EtherCAT Technology Section I Bedienungsanleitung Seite 55