>> Without a current limiting resistor on the base of the transistor, you stand a good chance of damaging it or perhaps the gate on the MAX232. Try it with a 1K resistor. << I like a 10Kohm resistor better. There is no need to draw nearly 5mA just to turn on the transistor. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu