Echelon LonScanner FX Protocol Analyzer - Manual (Page 20)

14 Introduction to the LonScanner Protocol Analyzer
interface (that is, each tool can use the network interface at the same time).
Network interface sharing applies to PCC-10, PCLTA-20/21, i .LON SmartServer,
i. LON 100 Internet Server, i. LON 600 L ON W ORKS /IP Server, and U10/U20 USB
Network Interfaces.
You can also run the protocol analyzer and the LonMaker tool (or any custom
LNS application) at the same time with the same network interface on a
computer with an LNS 3 Server if you use an i .LON SmartServer, i. LON 100
Internet Server, or an i. LON 600 L ON W ORKS /IP Server as the network interface.
In addition, you can import device and network variable names from your LNS
database if you have an LNS 3 Server.
If you have an LNS Turbo Edition Server installed, you can use the protocol
analyzer to monitor IP-852 channels, as well as L ON W ORKS channels. If you
attempt to monitor an IP-852 channel without an LNS Turbo Edition Server
installed, the LonScanner Protocol Analyzer issues an error message (“Failed to
open channel via OpenLDV”).
The IP-852 interface operates differently from L
ON W ORKS channels. The layer 2
interface of every device on a L ON W ORKS channel receives every packet on the
channel. But, Echelon’s IP-852 devices and routers do not automatically forward
packets to every other device and router on the channel. Instead, they selectively
forward packets directly to the intended destination devices and routers on the
channel. As a result, the protocol analyzer does not receive packets that are sent
on an IP-852 channel from one device or router to another if the source or
destination device is not the computer running the protocol analyzer.
Figure 7 demonstrates this behavior. In the figure, the protocol analyzer is
monitoring an IP-852 channel that contains two devices (named “IP-852 Device
1” and “IP-852 Device 2”). The protocol analyzer receives only those packets sent
between the IP-852 devices and the LonScanner computer (the network paths
displayed in green). The protocol analyzer does not receive packets sent between
IP Device 1 and IP Device 2 (the network path displayed in red).
LonScanner
Computer
IP-852 Device 2 IP-852 Device 1
IP-852 Channel
Figure 7. Using LonScanner to Monitor an IP-852 Channel