hi david,thanks for the scada test program using ascii string protocol using micset scada.its working.but how to operate start n stop buttons using ascii protocol.i could do it with text protocol n could not do with ascii.further plz send few more sample codes on scada using ldmicro.i will send u the start button code i tried with scada.its working but it connects on multiple attempts.what may be the reason for connecting on multiple attempts?plz also provide a solution to avoid it.plz help.thank u