The number of the serial or parallel port in use.
<port>
The following displays the value of portnumber in a text stimulus:
<text sometext>
/ items= ("portnumber = <% port.someport.portnumber %>")
</text>
The following displays the value of portnumber in an instruction page:
<page somepage>
portnumber = <% port.aport.portnumber %>
</page>