SIRIUS® Measurement Modules
5 SIRIUS® Measurement Modules
5.1 Data Transfer Overview
Dewesoft offers SIRIUS® slices that can use different data-transfer technologies:
USB
high data-throughput allows for high sampling rates (up to 1MS)
extra connectors for power and synchronisation required
direct connection to USB ports on the PC
Standard EtherCAT®
only one single cable needed for data, synchronisation and power
data-throughput allows for sampling rates up to 20kS/s
direct connection to standard Ethernet port on the PC possible
DS-EtherCAT+
this is a Dewesoft enhancement to the EtherCAT® standard, so that we can combine the advantages of
Standard Ethernet and USB data-transfer
5.1.1 USB
USB is a high speed data bus being able to transmit full speed data for all channels to the measurement PC.
The SIRIUS® USB slices allow sampling rates of up to 1MHz (high-speed) and can be directly connected to USB port
s on the measurement PC (or S-BOX).
If a USB hub is used, the USB bandwidth is shared by the connected USB devices (i.e. SIRIUS® slices) and thus you
may not be able to use the max. possible sampling rate. Note, that also the USB connectors on laptops are often
internally connected to a USB hub!
Note, that this will for sure not happen when you use the SIRIUS-R8 (see 4.6 SIRIUS-R8 on page 36 ), because the
internal wiring of the SIRIUS-R8 is designed with great care, so that none of the USB ports are shared and every single
measurement slice can use the full maximum sampling rate: for all 64 (dual core) channels or 128 (high density)
channels.
In comparison to the EtherCAT® version, the SIRIUS®-USB slices need extra connectors for power supply and
synchronisation.
5.1.2 EtherCAT®
EtherCAT® - Ethernet for Control Automation Technology - is a 100 Mbit Ethernet-based fieldbus system. The protocol
is standardized in IEC 61158 and is suitable for both hard and soft real-time requirements. EtherCAT® can be used for
applications that require short data update times with low communication jitter (for precise synchronisation purposes).
5.1.2.1 Standard EtherCAT® features
Strong points of standard EtherCAT®:
Point to point communication
High distance between modules possible (75 m)
Only a single cable for power, data and synchronisation
100x faster than CAN bus
Real time performance
Physically fully compatible to Ethernet: i.e. same connector, no Gate-modules or adapters required
Doc-Version: 1.4.2 www.dewesoft.com Page 47/166
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