Hi all,
Ihave implemented a routine that establish and mantains communication with an Electronic cash register, according with its proprietary protocol, via RS232 using MSCOMM32.OCX, VFP 6 SP3, using events. I take a chunk of data from a table, send it, wait for an ACK and continue. It does a fair work, communicates well in some circunstances, in certain PCs and not in others. The problem arises in a non repetible pattern, presumably failing to receive the ACK after a number of succesful cycles.
I suspect that Windows or Fox does some 'invisible' work after a while without user interaction. I have disabled energy saving at Bios level and OS ( Win 98 2nd edition mostly)
Can anyone give me a clue? Thank you in advance.
Ernest Luque