SATO M8485S Operator's Manual download pdf (Page 162)

Single Job Buffer

The printer receives and prints one job at a time. Each job must not exceed 64K bytes.

The single Job Buffer mode is selected with DSW2-5 (see page 3-3).

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. The Multi Job Buffer mode is selected with DSW2-5 (see

page 3-3).

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).

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 (i.e., label out, ribbon out) 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.

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 6. Interface Specifications

Page 6-2 9001034 Rev E SATO “S” Print Engines

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SATO M8485S Operator's Manual Page 162