SATO M-5900RV Specifications download pdf (Page 32)

32 M5900RV

4. Interface Specifications Operation Manual

The receiving buffer will not be able to receive more data again until

a "Buffer Available" condition occurs. This takes place when the

receiving buffer has emptied so that only 56K bytes of data are

being held (8K bytes from being full). At this time, DTR will go

"high" or an X-On is sent to tell the host that it can again receive

data.

All printer error conditions, will cause the printer to go busy (DTR

"low" or X-Off) until the problem is corrected, and the printer is

placed on-line. The printer will also be busy if taken off-line from

the front panel.

4.3 The Receive Buffer

The 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 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 64 K 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 pro-

tocols. See these sections for more details. With an empty receiv-

ing 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 3-1.

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SATO M-5900RV Specifications Page 32