Omron NQ-Designer: communication with connected unit

[MBS 1]

hi @ all, Is anybody of you familiar with this program? I am new to this board here and the nq-designer. I would like to know how I can control a unit, which is connected via RS232 to an NQ5. Normally, the unit is controlled via hyperterminal in Windows by typing in the commands. How should I configure a tag in nq-designer, that for example the command "lih on" is send to the unit after touching a button on the NQ-screen? Or do I not have the possibility to enter commands in textform? I have already browsed the software, but I didn't get an idea how to do this so far. Thx for help in advance! MBS

[MBS 1]

I have to add that the unit is connected directly to the NQ5 (thus without plc)