Specifications

DATAPROCESS EUROPE S.p.A.
ST3xx ST4xx ST5xx
– PROGRAMMING MANUAL -
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(ASCII Code 4). It will then activate the receiving buffer and will function as a normal
printer with the only difference that any status information received, produced during the
printing (or when a status request is processed), will be loaded in the transmission buffer
and will not be transmitted until another activation sequence is received. If the transmis-
sion buffer is empty when the activation sequence is received, only the EOT will be
transmitted.
When the printer recognises an activation sequence addressed to another printer it will in-
hibit the reception buffer and will ignore the characters until it recognises its own activa-
tion sequence.
The master-slave architecture requires a periodic poling of all the printers in the network
and in particular for the data being printed. This is to avoid the buffers becoming saturated
otherwise the autonomy of each printer is for approximately 500 labels before the printer
suspends the printing and waits to be interrogated before emptying the buffer. Further-
more, if a lot of data is to be sent to the printer (more than 60,000 characters), it is best to
send the first block of 60,000 characters and then interrogate the printer. When the XON
signal is received, this indicates that there are fewer than 50,000 in the buffer and it is
therefore possible to send another block of 10,000 characters. The XON should then be
tested again and another block of 10,000 can be sent. This process should be continued
until all of the data has been sent.