Hitachi UX Twin-Nozzle, Technical Manual

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5-70
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Communication Buffer
External device
IJ printer
ENQ STX DLE
ACK ACK
Content
Item
No.
ETX
External device
IJ printer
STX ESC2 Header ETX
ACK
External device
IJ printer
STX ESC Header ETX
ACK
External device
Online
IJ printer
Ready Ready Standby
1 … 20 21 … 40 Clear Restart
Print start signal
Printing
1 21 22
5.9.3 External Communications
5.9.3-1 Transmitting print contents
(1) Function
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The received print content will not be reflected in printing immediately, but temporarily held in buffer.
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To facilitate operation, first input fixed characters that do not need to be changed, and then transmit
only the print items to be changed.
(2) Restriction
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The maximum number of print items which can be sent at 1 time is 8 print items (maximum 80
characters).
5.9.3-2 Clearing buffer and restarting printing
(1) Function
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When text “clear buffer” is transmitted, the print contents held in buffer will be cleared.
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To restart printing, perform the following procedure after transmitting text "clear buffer".
If this procedure is not followed, the print contents stored before the buffer cleared may be printed.
Procedure:
Transmit print contents so that print contents sent at least N times remain in the buffer.
(N: Data number at Fault)
Transmit text "restart printing".
Printing is possible whenever the print start signal is input.
1
2
3
[Conceptual diagram of transmission procedure]
Header 76h : Clear buffer
Header 77h : Restart printing
Header 2Dh : Clear buffer
Header 5Ah : Restart printing
(2) Restriction
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Independently transmit text "clear buffer" or "restart printing": These cannot be transmitted with
another text (print content transmission, print data call-up transmission, etc.).
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Transmit text "clear buffer" or "restart printing" only while printing is not in progress.
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Input the print start signal at least 500 ms after ACK is returned to "restart printing".
5.9.3-3 Print data call-up transmission
(1) When calling up print data via communication, always execute the call-up before transmitting
data to the buffer. If call-up is executed in the Ready status, the called up print content will be
printed.
[Existing machine message] Existing machine message can also be used.