Epson TM-T88III Programming Manual page 217

C O N F I D E N T I A L
During the interval between the sending of the data header and NUL, ASB status and the real time
commands are rendered invalid.
When communication with the printer uses XON/XOFF control with serial interface, the XOFF code may
interrupt the "Header to NUL" data string.
The 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]
It will be necessary to perform the ESC/POS Handshaking Protocol procedures listed below when using
Functions 64 and 80.
Procedure Host operation
1
2
3
(*1) Response Code
ASCII
ACK
NAK
CAN
Paper roll Bit-image commands
This command sends
Function 64.
Data is received from printer. Key code list is sent.
Response code (*1) is sent.
Hexadecimal Decimal
06 6
15 21
18 24
GS ( L GS 8 L
Printer operation
Function 64 is initiated.
Procedures (*2 and *3) are performed
according to response code.
Request definition
Send next data group.
Resend just-received data group.
Cancel send operation.
Ver. 10.01 p. 217