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Communications
515 FA01 - 29 August 2021
75
Printer Data Control
Some printers have limited data buffers and are therefore unable to collect
all the print data being transmitted. The 500 Series has the capability of
software handshaking. The Xon/Xoff characters can be used by any of the
printer types to control the flow of data to ensure that data is not lost.
Some printers will also transmit an Xoff character in response to other
events such as printer being off-line, print head not engaged or power being
removed. The specific behaviour of the printer being used should be noted.
Error Messages
There are two printer error messages that can be displayed.
PAPER OUT
This message is related to the Printer Type PRN-03 TM295 Slip printer. It
is standard procedure with this printer to check for paper status before
printing. If a print is attempted but there is no paper the PAPER OUT
message will be scrolled. The instrument will continue to poll the printer for
paper and if paper is detected before a communications timeout expires the
print will commence.
COMMS TIMEOUT
This message is relevant for all printer types and will be activated for the
following conditions.
1. If the flow of data is stopped due to software or hardware handshaking
and is not allowed to resume before the communications timeout.
2. If Printer Type is PRN-03 Slip printer and a paper status is requested but
no response is received within the timeout period.
3. Paper Out has been detected for Printer Type PRN-03 but no paper is
inserted within the timeout period.
When a communications timeout error has been activated the message
COMMS TIMEOUT will be scrolled once, the request to print will be
cleared and the instrument will return to its normal mode.
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