If you were looking to send text from the HMI to your controller, you would do the following:

Create a new macro

LW0[0]='et'; //loading 'te' to your send buffer

LW0[1]='tx';//loading 'xt' to your send buffer

LB0=1;//This is the send command bit

If you were using a Universal ascii slave the parameters are the following:

LW0-LW99 => Local Word Register 0 - 99 are send data buffers, meaning that any data stored in here the second LB0=1 all data will be transmitted through you communication medium.

LW100-LW199 =>Local Word Register 100-199 are receive data buffers, meaning that any data your controller sends back will be received begining at LW100

LB0=1 => Once again just the send command

You simply tie this macro to a function key which is no more difficult than simply dragging and dropping.

rafaelmc
http://www.graphicdisplay.org