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SATO M-5900RV Operator and Technical Reference Manual Page 5-3
Section 5. Interface Specifications
PN 9001081
Rev. C
5.3 The Receive Buffer
The M-5900RV printer has the ability to receive a data stream from the host in
one of two ways. The receive buffer may be configured to accept one print job at
a time or multiple print jobs. The single job print buffer is generally used by
software programs that wish to maintain control of the job print queue sot that it
can move a high priority job in front of ones of lesser importance. The multiple
job buffer on the other hand prints all jobs in the order they are received by the
printer and the order of printing cannot be changed.
Single Job Buffer
The printer receives and prints one job at a time. Each job must not exceed 64K
bytes.
Multi Job Buffer
The printer is able to continuously receive print jobs, compiling and printing other
jobs at the same time. It acts much like a "print buffer" ot maximize the
performance of the host and the printer.
When using the RS232 Serial interface, the Multi Job Buffer uses either the
Ready/Busy with DTR (pin 20) or X-On/X-Off flow control protocols. See
these sections for more details. With an empty receiving buffer, the status of DTR
is "high" (or an X-On status if using X-On/X-Off), meaning the printer is ready to
receive data. When the receive buffer is holding 62K bytes of data (2K bytes from
being full), DTR will go "low" (or an X-Off is sent) indicating the printer can no
longer receive data. This condition is called "Buffer Near Full" (see figure below).
0
62K 64K
Buffer Near Full
DTR Low
or
X-Off
0
56K 64K
Buffer Available
DTR High
or
X-On
*DTR High
or
X-On
DTR Low
or
X-Off
* Data Terminal Ready