Epson TM-J2000 Spezifikationen Seite 627

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Seitenansicht 626
CONFIDENTIAL
Paper roll Customize commands GS ( E
Ver. 10.05 p. 627
When the host PC transmits the function data, transmit the next data after receiving the corresponding
data from the printer.
With a serial interface printer, be sure to use this function when the host can receive data.
With a parallel interface printer, data transmitted (excluding ASB status) with this command (“Header
to NUL”) is temporarily stored in the printer transmit buffer, as with other data. When the host goes
into reverse mode, the printer then transmits the data sequentially from the beginning of the transmit
buffer. Transmit 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 14.
(*1)
Response code
Step Host process Printer process
1 Send GS(C <Function 14>. Start processing of Function 14. (Read specified record back to host.)
2 Receive data from printer. Send device 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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