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245U-E Wireless Ethernet Modem User Manual
47
Rev Version 2.24
routing rules appropriately for devices either side of the network.
• If you want the serial device visible as present on the wireless or wired network, the local IP address
must be the same as the IP address set for the desired port. A process called “proxy ARP” is used
to make the device visible on the network. In this process, the 245U-E pretends that it holds the IP
address on the network, and responds on behalf of the remote device.
The result of this is similar to bridging for a single device, with some exceptions. One of these exceptions
is the inability to handle name server searches of the network via this serial link. For example, you would
encounter difficulty if you were to use Windows Explorer over the serial link to find a PC on the wired
network. For this to operate correctly you must explicitly map computer names to IP addresses in the
LMHOSTS file on your PC.
To configure Windows XP to establish a PPP connection to a 245U-E in SETUP mode:
1. On Network Connections in Windows XP, select “Create a new connection.”
2. In the New Connection Wizard, click Next.
3. Set up an advanced connection.
4. Connect directly to another computer.
5. Set PC as guest.
6. Set the Connection Name.
7. Select a COM port.
8. Select availability.
9. Click Finish.
10. Select properties of this new connection by right-clicking the connection.
11. On the General tab click Configure.
12. Ensure that the maximum speed is 115200 bps, and click OK.
13. Select the Networking tab, and then click Internet Protocol (TCP/IP) in the list box and click Properties.
14. On Properties, click Advanced.
15. On the Advanced TCP/IP Settings, General tab, clear the field in the PPP link “Use IP header
compression.”
Configuration is now complete.
16. Click the newly created link to establish a connection to 245U-E.
17. Ensure that the username and the password are entered exactly as configured in 245U-E.
When booted in SETUP mode, the PPP server has username “user” and the password “user.”
Serial Gateway (Server/Client/Multicast)
Serial gateway functionality is available for both RS-232 and RS-485 ports independently, and enables serial
data to be routed via the wired or wireless network connection. Serial gateway functionality is similar to
radio modem functionality, allowing point-to-point and multipoint serial data transfer.