Q: How do I create a macro that generates a simple message to a specific port?

Here's a simple macro to generate a 1000 Hz tone for .99 second out transmitter 1.

    MPW 20 1234 MPW 15 9710 9910 57014899 *

Breaking it down:

    MPW 20 1234

creates the macro named 1234.  If it already exists you will get an error.  (See page 5-9.)

    MPW 15

queues the message that follows.  (See Chapter 6 and page 6-62.)

    9710

routes the message that follows out port 1.  (See page 6-4.)

    9910 57014899

generates a 1000 Hz tone for .99 second.  (See pages 6-21 and 6-24.)