thanks for the reply martin.
----- Original Message ----- From: "Martin Phillips" <[EMAIL PROTECTED]> To: "U2 Users Discussion List" <[EMAIL PROTECTED]> Sent: Wednesday, March 03, 2004 3:51 AM Subject: Re: UV losing print characters > 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 -- u2-users mailing list [EMAIL PROTECTED] http://www.oliver.com/mailman/listinfo/u2-users
