Instructions

UM-0085-B09 DT80 Range User Manual Page 253
RG
6. Press OK to close the various "properties" dialogs, and return to the Connect dialog (Figure 92). You can now
try establishing a PPP connection, see Using PPP (P253).
Using PPP
Once a PPP connection has been set up, the general day to day process for using it is as follows:
1. Ensure that the physical communications link is plugged in (modem or null modem cable).
2. Establish a PPP connection by "dialing up" to the DT80 (for a direct cable connection no actual "dialling"
occurs).
3. After the connection process completes you will be able to access the DT80 via the IP address for the serial
port in use (see IP Addresses(P246). For example, if the host RS232 port is being used then the IP address is
1.0.0.2.
4. When you have finished, the PPP connection can be disconnected. The DT80's IP address (e.g. 1.0.0.2) will no
longer be valid.
See below for more details.
Establishing a Connection
To establish a connection:
1. From the Start menu, select Control Panel, then Network Connections (or Network and Sharing Center),
then Connect to a Network, then select the "network connection" that you created for the PPP link.
2. The Connect dialog (Figure 101) will be displayed. Press Connect.
3. If all goes well, a few status messages will be displayed briefly as Windows establishes the physical connection,
logs in to the DT80, and then adds the DT80's IP address to its networking configuration.
4. By default, an icon representing the PPP connection will now be displayed in the Windows system tray:
Figure 106: System tray icon for an active PPP connection (Windows XP)
Note: for a USB connection, the indicated "speed" is irrelevant. USB always operates at a fixed rate.
Using the Connection
Once the connection has been established, you can access the DT80 in much the same way as you would using an
Ethernet connection. The IP addresses for the three DT80 serial ports are:
• for the serial sensor port
• for the host RS232 port
• for the USB port
The appropriate IP address can then be entered into a web browser, or FTP client, or DeTransfer/DeLogger, etc.
The IP address of the host computer at the other end of the PPP link is as above but with a 1 rather than a 0 in the
second last position. So for a host RS232 PPP connection the DT80's IP address is 1.0.0.2, and the host computer's IP
address is 1.0.1.2.
 Limitations
It is important to note that a PPP connection provides connectivity between the DT80 and a single host computer only.
The PPP "network" linking the computer and the DT80 is a private
network and is not visible to any other computers.
Closing a Connection
To terminate a PPP session, simply right click on the connection's system tray icon and select Disconnect. Alternatively,
use Connect To to bring up the list of all defined network connections, then right click on the appropriate connection and
select Disconnect.
You can also end a PPP session by sending the DT80 command
CLOSEDIRECTPPP. By default, this command will
close all currently active PPP connections. To close a connection on one particular port, specify the port number
(1=serial sensor, 2=host, 3=USB), e.g.
CLOSEDIRECTPPP 3
will close the PPP session on the USB port.