To do this, you need to create a formula in the Formulas table and use this formula for the output channel. The text would be build using the formula.
Set the output channel number to the command settings in the Auto Control Module.
Formula example (not tested):
byte[] MyText()
{
return System.Text.Encoding.GetBytes("Addr;Subj;Text");
}
When you make this formula working, I can explain how to insert channel values.