Hi All, There are two different serial protocols that vending machines use: MDB and Executive. Does someone know how them work? I need to program a PIC with these protocols and I've been searching the wed and I couldn't find relevant information. Could somebody help me?? Thanks!!!! -- Martin Leg mailto:mleg@arnet.com.ar -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu