The most common cause of this in my experience is incorrect use of flow control with serial printers.
For the non-techies (are there any on this list?).... Your UV system can probably produce data faster than the printer can handle it so it needs a way to say "stop!". There are fundamentally two techniques in use though there are variants. The first technique uses one of the wires in the printer cable (DTR - Data Terminal Ready), to say stop/go. The other technique sends a character (X-OFF, Ctrl-S) from the printer to the computer to say stop and (X-ON, Ctrl-Q) to say go. (If you've ever wondered why this works on most terminal output processes, they often do the same). If your computer is set up to use DTR but your printer is expecting to use X-OFF/X-ON, the system is not going to stop sending data when required and you lose characters. Obviously, the same happens if the settings are the other way around too. A variation on this which is more difficult to find is that not some low cost serial cables don't have a DTR wire. So, you printer says stop but this never gets to the other end of the cable. You say that this is an infrequent problem. Although that makes this sort of scenario less likely, it can still happen because many modern printers have buffers large enough to hold quite big print jobs. Martin Phillips Ladybridge Systems 17b Coldstream Lane, Hardingstone, Northampton NN4 6DB +44-(0)1604-709200 ----- Original Message ----- From: "gerry simpson" <[EMAIL PROTECTED]> Subject: UV losing print characters > a client has reported that they are randomly & infrequently having > characters dropped from print jobs. > this recently happened during an invoice run where a tax value of 1147.90 > was printed as 117.90 - the invoice total printed correctly, the invoice > data on file has the correct value and a reprint shows the correct value. > > I am thinking that this is > - a problem with the printer in question ( i am not yet sure if this is > a single printer issue or not ) > - a problem with a network connection > - an issue to be raised with either IBM or HP > > has anyone seen this happen before ? > > gerry -- u2-users mailing list [EMAIL PROTECTED] http://www.oliver.com/mailman/listinfo/u2-users
