Citizen Systems iDP-562 Benutzerhandbuch

iDP-562 User’s Manual

CITIZEN

21

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Input Control for Double Buffer

Double buffer transfer is made as follows.
1.

 

The computer transfers 1

st

 and 2

nd

 BYTE of DATA after checking READY condition.

2.

 

The printer continues BUSY condition for receiving 2

nd

 BYTE of DATA.

3.

 

The computer transfers 3

rd

 BYTE of DATA after checking READY condition.

The printer expects Double Buffer transfer at the first stage. Therefore, after completion of 1

st

 BYTE of DATA

reception, the printer waits for 2

nd

 BYTE of DATA. The printer recognizes Single Buffer transfer for the absence

of START BIT after 1 ~ 2 STOP BIT.