
ETAS
Functional Description
ES593.1-D
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User Guide
24
The function "CAN Pre-Buffering" can be configured for both interfaces CAN1
and CAN2 independently of one another in the application software INCA
(HWC).
5.5.5
Bus Terminating Resistor
The High-Speed operating mode of the CAN interface requires the use of bus
termination resistors.
In accordance with the CAN specification, a bus termination resistor of
120
Ohm is required at each of the two open ends of the bus. This has to be
connected to the cable or to the connector. ETAS supplies cables and termina
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tion resistors of 120
Ohm for setting up CAN networks.
5.6
Time Synchronization
The modules provide a global clock pulse to compare the measurement chan
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nels in a module network.
Modules connected to the HOST interface can synchronize the ES593.1-D
(SYNC-IN). If no synchronization signal is received at the HOST interface, the
ES593.1-D acts as master module for synchronization.
The time synchronization unit of the ES593.1-D master synchronizes the con
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nected modules via the Ethernet lines. The synchronization signal is relayed to
connected modules at the ETH1 and ETH2 interfaces (SYNC-OUT). The slave
modules adapt to the clock pulse specified by the master module.
The periodic synchronization signal is superimposed onto the Ethernet signals
without affecting data transfer. This excludes the possibility of a phase shift
between the individual measure signals, even when measurements are taken
from different modules.
The data of all connected modules of the ES4xx, ES51x and ES6xx lines is
acquired synchronously (ETAS device synchronization).
5.7
"Wake-Up" Function
Energy consumption must be as low as possible when used in the vehicle
because the measuring equipment is powered by a battery. This is why the
ES593.1-D module is equipped with a link signal detector for an automatic
power-saving feature at the following interfaces:
• HOST
• ETH1
• ETH2
• CAN1
• CAN2
Using the function "Wake-up", the module can automatically switch between
the operational states "Standby" and "On" and start the measurement autono
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mously after switch-on.