SATO CL608VA Operator's Manual download pdf (Page 180)

THE RECEIVE BUFFER

The CL printers have 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 so 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” to 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).

62K 64K0

DTR High

X-On

DTR Low

X-Off

Buffer Near Full

0 56K 64K

DTR Low

X-Off

DTR High

X-On

Buffer Available

Section 5. Interface Specifications

Page5-29001035Rev.ESATOCLSeriesPrinters

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SATO CL608VA Operator's Manual Page 180