No, the E is at +5 volts. The resistor pulls down. -Bob > Wouldn't a PNP cause the same problem as a NPN darlington ? When the PIC > pulls > the base to GND the transistor is still open and it pulls C to E which is > at > +0.6V. This is imho a little close to the 'standard' threshold of a RS232 > receiver. A Darlington would have the same problem. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist