K-Patents PR-21-S - Manual (Page 112)

106 PR-21-S instruction manual
the command prompt (press Enter to give the command), see figure 11.7 (in Mac
OS X and Linux the same command is called
ifconfig ). The result will give you
your computer’s IP address, so you can change the DTR to match; the connection
should always work if you match the first three groups of numbers and just change
the last number.
Figure 11.7 Typical IP configuration for a stand-alone laptop
when connected to a DTR; laptop wireless (WLAN) is turned off
Note: You may have to connect the cross-over cable and power on the DTR be-
fore your computer generates an IP address for the ethernet connection (computer
reboot may also be required). Note also that the connection will not work if the
computer and the DTR have exactly the same IP address.
Note: Please make sure that your WLAN (Wireless network connection) is not
active when you connect to the DTR. If the WLAN is active, the computer’s Ethernet
connection may not function as expected.
When you have set the DTR (and/or the computer) according to instructions
above, you can proceed to test the connection as instructed below in Section 11.3.
11.3 Testing the Ethernet connection
On the Ethernet connector inside the DTR there are two diagnostic LEDs. The
green LED indicates that the physical connection is working, i.e. that both
ends of the Ethernet cable are plugged in, the device in each end is powered and
the cable is of correct type. The orange LED indicates traffic in the cable, i.e.
that DTR receives data.
The IP address can be tested with a ping command after the physical Ethernet
connection has been set up and the DTR is powered. In Windows systems ping is
available by using the Command Prompt (usually found in the Accessories). The
usage of ping is very simple: go to the command interface (for example the Com-
mand Prompt), type the name of the command and the IP address you want to
check and press Enter. If the Ethernet connection is good, the DTR is powered on
and the address given to ping is correct, the DTR will answer to ping and return
any data packets sent to it, see Figure 11.8.
11.3.1 Troubleshooting the connection
If you get an error message from a ping command (for example Request timed out
like in Figure 11.9), check your connections.