ETAS ES415.1 - Data Transfer and Communication Protocols

ES415.1 - User’s Guide26
ETAS
4.4 Data Transfer
For data transfer, the ES930.1 as well as the ES4xx and ES63x modules use a
100 Mbit/s Ethernet network connection in duplex operation. The data transfer
can be adapted flexibly to suit the test setup and the measurement task.
4.4.1 Communication Protocols
The universal ASAM measure and calibration protocol XCP is used for serial com-
munication. On the Ethernet transport and network layer, the UDP/IP protocol is
used (see Fig. 4-7 on page 26).
Within the XCP protocol, the modules transfer, among other things, module ID,
time stamp and measure and/or stimulation data in an extremely precise and
predictable time pattern. The communication protocol used for the modules
avoids repeated transfer of protocol data, which takes place, for example, in
handshake-based systems. This makes a high bandwidth available for reference
data.
Fig. 4-7 Message Format “XCP on UDP” (Schematic)
Using the UDP/IP standard for data transfer makes it possible to connect the
modules directly to a PC, a router or a switch. In XCP communication, the PC has
the master function.
Note
The complete Ethernet bandwidth is available for both measure data and con-
trol variables.
Calibration procedures can take place in a Rapid Prototyping application with-
out delay with measure data being acquired at the same time.
SA
48
UDP Header
IFG
min. 96
IP Header
DA
48
Pr e
56
So F
8
CRC
32
Typ e
16
DATA
n*8
XCP M essag e 1 XCP M essag e n
...
XCP on Ethernet Message
XCP Header XCP Package
DATATIM E STA M PDAQFILLPIDCTRLEN
Embedded UDP/IP
Embedded XCP
IEEE802.3 (Et hernet)