Weidmuller WI-MOD-E-G Bedienungsanleitung PDF herunterladen (Seite 59)

Page 59 February 2010

3.16 Socket Routing

TCP/IP Port forwarding

The WI-MOD-E is primarily a TCP/IP Routing Server, to which a number of external TCP/IP

Clients may connect. Since TCP/IP connections are point-to-point only, Socket Routing allows a

number of remote TCP/IP clients to connect to the WI-MOD-E simultaneously, the WI-MOD-E can

then route data between the separate remote client devices as necessary.

Socket routing requires that the remote devices initiate the connection, so they must be acting as

TCP/IP clients. Once a connection has been established, the WI-MOD-E can keep it open using

'keep alive' messages which are configured at specific pre-configured time intervals.

In order to route data between connected devices efficiently, the WI-MOD-E would need to have

detailed knowledge of the protocol comprising that data. Alternatively, if the protocol is not known

by the module, then any data frame arriving from a given device can simply be forwarded to all

other devices (i.e. broadcast). The WI-MOD-E Routing Server supports ModBus RTU routing

mode, a generic master/slave protocol mode, and a broadcast mode.

The example below illustrates the type of topology that would typically be used in conjunction with

the WI-MOD-E – that is, an existing Wifi network using WI-MOD-E modems to connect remote

devices back into a corporate LAN. At the same time a server located on the LAN uses port

forwarding to forward TCP/IP data arriving from remote GPRS modems to the WI-MOD-E. In this

case, the fixed IP address of the WI-MOD-E is used by the server for port forwarding, whereas the

remote GPRS modems connect to the server using a domain name and TCP port number.

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Weidmuller WI-MOD-E-G Bedienungsanleitung Seite 59