Real-Time Workshop

The External Interface MEX-File

You must specify the name of the external interface MEX-file in the External Target Interface dialog box.

The default external interface MEX-file is ext_comm. ext_comm implements TCP/IP-based communications. ext_comm has three optional arguments, discussed in the next section.

MEX-File Optional Arguments

In the External Target Interface dialog box, you can specify optional comma-delimited arguments that are passed to the MEX-file. These are:

• Target network name: the network name of the computer running the external program. By default, this is the computer on which Simulink is running. The name can be:
• a string delimited by single quotes, such as 'myPuter'
• an IP address delimited by single quotes, such as '148.27.151.12'
• Verbosity level: controls the level of detail of the information displayed during the data transfer. The value is either 0 or 1 and has the following meaning:

1. 0 -- no information

   1 -- detailed information

• TCP/IP server port number: The default value is 17725. You can change the port number to a value between 256 and 65535 to avoid a port conflict if necessary.

You must specify these options in order. For example, if you want to specify the verbosity level (the second argument), then you must also specify the target host name (the first argument).

Note that you can specify command line options to the external program. See Running the External Program for more information.

Using the TCP/IP Implementation

External Mode Compatible Targets