User`s guide

Communications
5 Rebuild the model.
In this case, the host PC waits for abo ut 20 seconds before declaring that
a time-out has occurred. Note that it does not take 20 seconds for every
download. The host PC polls the target PC about once every second, and if
a response is returned, declares success. Only in the case where a download
really fails does it ta ke the full 20 seconds.
Are Multiple Ethernet Cards in the Target PC Causing
Communication Issues?
IfyouhavemultipleEthernetadapters o f the same type in the target PC, the
xPC Target software chooses one of these adapters for communication. You
might need to experiment to determine which Ethernet adapter the software
has chosen. Depending on your setup, perform one of the following:
If you are not using the Network Boot option to boot the target PC:
If you cannot establish communication between t he target PC and host PC,
switchthenetworkcabletotheotherEthernetportandattempttoestablish
communication again. If this is successful, use this Ethernet port for the
communication between the h ost PC and target PC.
If you are using the Network Boot option to boot the target PC:
The target PC BIOS might choose a different Ethernet adapter (for example,
Ethernet adapter A) from the one that the xPC Target software chooses (for
example, Ethernet adapter B). If this is the case, the following sequence will
happen:
• The target PC within the dedicated network boots using Ethernet A.
• When the target PC boots, it will try to use Ethernet B.
Regardless of which port you connect the Ethernet cable to, the software
will not be able to establish a connection between the target PC and host
PC. This is because during the network boot process, the host PC associated
the Media Access Control (MAC) address o f Ethernet adapter A to the IP
address assigned to the target PC.
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