Instructions

UM-0085-B09 DT80 Range User Manual Page 235
RG
How to set up Ethernet
Initial decisions
In order to set up an Ethernet connection to the DT80, you need to decide:
• whether the DT80 will connect directly to a PC (Figure 89), or connect to an existing LAN (Figure 90), or
connect to a modem/gateway (Figure 91)
• whether the DT80 will use a static (manually configured) or a dynamic (automatic) IP address.
A direct Ethernet connection to a PC will typically be a temporary arrangement, so you would normally choose the
automatic (Auto-IP) IP address option.
For a LAN or gateway connection, the automatic (DHCP) option is considerably simpler to set up, as the IP address,
subnet mask, gateway and DNS server addresses will normally all be set automatically.
There are some drawbacks to a dynamic IP address if you intend to connect to the DT80 using dEX or DeTransfer –
namely you need to determine what that IP address is, and the IP address may change. If the DT80 is close by then you
can check the IP address on its display, but for a remote DT80 this is obviously not practical and a static IP address
would normally be used.
If the DT80 is accessible via the Internet then a web-based dynamic DNS service such as dynDNS.com can also be
used to locate its IP address. This is discussed further below.
Direct Connection to PC – Automatic IP address
1. Check that Ethernet port is enabled
Using the front panel UP and DOWN keys, select the Ethernet IP screen. It should show:
Eth IP: Auto
No cable
If this is not the case then the DT80's Ethernet port has been disabled or set to a static IP address. Press Func to
access the function menu, then scroll down to the Auto Ethernet IP option and press OK/Edit. Verify that the display is
now as shown above.
2. Connect Ethernet cable
You can now connect a cross-over Ethernet cable between the DT80 and the computer. Verify that the green Link LED
on the DT80's Ethernet connector comes on. If the Link LED does not come on then check that:
• the cable is a correctly wired cross-over cable
• the computer's Ethernet port is enabled (check "Network Connections" in Windows control panel)
3. Check DT80 IP address
When the Ethernet cable is connected, the DT80 will begin searching for a DHCP server. When connected directly to a
PC, there will normally be no DHCP server available, so after 10 seconds or so the DT80 will give up and assign itself an
"Auto-IP" address. The Ethernet IP screen will then change to something like:
Eth IP: Auto
169.254.25.77
If you have a DT81 (which has no front panel display) then you can alternatively send the command:
IP
169.254.25.77
4. Wait for Windows to acquire IP address
Meanwhile, Windows will also be looking for a DHCP server. During this time you may notice an animated icon in the
system tray, which, for Windows XP, will look something like the following:
Figure 93: Windows XP searching for a DHCP server
Windows normally spends about 60 seconds looking for a DHCP server, then it, like the DT80, will give up and assign
itself an Auto-IP address, at which point the system tray icon will disappear.
A message may be displayed at this point warning that the network connection has "limited or no connectivity". This is
normal, and simply indicates that the Internet will not be accessible using this network connection.