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Weidmuller Wireless Ethernet Modem & Device Server WI-MOD-E-G/A User Manual
3.11 - Serial Port Configuration
The WI-MOD-E has an RS-232, and an RS-485 port for serial communications. These ports may be used for different
purposes. The WI-MOD-E offers three different serial functions, which are PPP server; Serial Gateway; and Modbus TCP
to RTU Gateway.
RS-232 PPP Server
The WI-MOD-E can be used as a PPP (Point-to-Point Protocol) Server to connect the wireless system to serial devices
via the RS232 or RS485 serial ports.
PPP Server enables a network connection to the WI-MOD-E over a serial cable. This is much like dial up internet. The
maximum serial data rate is 115,200bps. Hardware or Software flow control may be selected.
With minimal configuration on the PC, you may use Dial up networking in Windows XP to connect to the network via the
serial port.
For the WI-MOD-E, users must configure the local IP address for the WI-MOD-E and the remote device IP address. Some
care must be taken in selecting these IP addresses.
If you wish to use routing over this serial network connection, then the IP addresses selected must not lie on
Wireless or Wired Ethernet networks already configured into the device. You must ensure they set 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, then 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 WI-MOD-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 WI-MOD-E in SETUP mode, follow these steps:
1. On Network Connections in Windows XP, select Create a new connection
2. On 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 Connection Name
7. Select a COM port
8. Select availability
9. Click Finish
10. Select properties of this new connection by right clicking on connection.
11. General Tab click on Configure button
12. Ensure maximum speed is 115200bps, click OK
13. Select Networking Tab - click on Internet Protocol (TCP/IP) in list box and then click Properties button.
14. On Properties form click Advanced button
15. On Advanced TCP/IP Settings form- General Tab, uncheck field in PPP link stating "Use IP header compression".
16. Configuration is now complete. Click on this newly created link to establish a connection to WI-MOD-E.
17. Ensure both the username and the password is entered exactly as configured in WI-MOD-E. (When booted in
SETUP mode, the PPP server has username "user" and password "user".)
Rev. 2.16
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