Horner APG XL4 OCS HE-ETN300 - Manual (Page 29)

SUP0740-07 CH.5
11/30/2009 Page 29 of 98 # 958
CHAPTER 5: INTERNET CONTROL MESSAGE PROTOCOL (ICMP)
5.1 ICMP Overview
ICMP is used for diagnostic purposes only, to determine if another device exists on the Ethernet
network.
Using ICMP, the Ethernet Module sends Ping Echo Requests to another device, and expects the
other device to answer with Ping Echo Responses. The Ethernet Module measures the round-trip
time of each Ping Echo Request / Response exchange and puts the result (in milliseconds) into
an OCS register.
In addition, when the Ethernet Module receives a Ping Echo Request from another device, it
answers with a Ping Echo Response.
Note: Although ICMP supports other network diagnostics, the Ethernet Module only supports
Ping.
5.2 ICMP Configuration
If ICMP protocol will be used in the application, ICMP Configuration must be performed, in
addition to the general Ethernet Module Configuration previously described in Chapter 3. To
configure ICMP protocol, use Cscape Programming Software to perform the following five steps:
1. Open the Ethernet Module Configuration dialog (Figure 3.5 [page 18]), as described in
Chapter 3.
2. Enable ICMP by checking the ICMP (Ping) checkbox in the Module Configuration dialog
(Figure 3.5).
3. Click on the Config button next to the ICMP (Ping) checkbox to open the ICMP Configuration
dialog (Figure 5.1).
Figure 5.1– ICMP Configuration Dialog
4. Set up the ICMP Configuration parameters as follows:
Ping IP Reg: Enter an OCS Register reference (such as %R200) to indicate which 32-bit
OCS register will be read to obtain the IP Address of the network device to send Ping Echo
Requests to.