Epson TM-J2000 Spezifikationen Seite 612

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Seitenansicht 611
CONFIDENTIAL
Paper roll Customize commands GS ( C
Ver. 10.05 p. 612
With a parallel interface printer, data sent (excluding ASB status) with this command (“Header to NUL”)
is temporarily stored in the printer send buffer, as with other data. When the host goes into Reverse
mode, the printer then sends the data sequentially from the beginning of the send buffer. Send buffer
capacity is 99 bytes. Data exceeding this amount is lost. Therefore, when using this command, promptly
change into Reverse mode to start the data receive process.
When communication with the printer uses XON/XOFF control with serial interface, the XOFF code may
interrupt the “Header to NUL” data string.
The transmission information for each function can be identified to other transmission data according to
specific data of the transmission data block. When the header transmitted by the printer is [hex = 37H/
decimal =55], treat NUL [hex = 00H/decimal =0] as a data group and identify it according to the
combination of the header and the identifier.
[Notes for ESC/POS Handshaking Protocol]
Use ESC/POS Handshaking Protocol below for Functions 2 and 5:
(*1)
Response code
Step Host process Printer process
1 Send GS(C <Function 2>. Start processing of Function 2. (Read specified record back to host.)
2 Receive data from printer. Send data.
3 Send response code.
(*1)
Continue processing
(*2) (*3)
according to response.
ASCII Hex Decimal Request
ACK 06 6 Send next data.
NAK 15 21 Resend previously sent data.
CAN 18 24 Cancel send process.
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