http://www.linear.com/product/LTC2871 LTC2871 - RS232/RS485 Multiprotocol Transceivers with Integrated Terminatio= n These are very nice. Could have used them instead of Maxim's stuff if I'd known about them before I designed one of my projects. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .