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Transmission Sequences
5.3 Transmission Sequences
5.3.1 Common Transmission Sequences
(1) Basic transmission operation.
When ENQ and ACK are present:
External device
IJ printer
ENQ
ACK
STX
Text
ETX
ACK
External device
IJ printer
ACK
ACK
ACK
DC2
ENQ
STX
Text
ETX
External device
IJ printer
STX
Text
ETX
ACK
External device
IJ printer
ENQ
NAK
External device
IJ printer
ENQ
ACK
STX
Text
ETX
NAK
External device
IJ printer
ENQ
ACK
STX
Text
ETX
BCC
ACK
(2) When DC2 (retransmission) code is used
(When no response is received though ENQ has been issued and yet the contents of print
area switched)
When ENQ is omitted:
(3) When the IJ printer is incapable of receiving data or is off-line
(4) Abnormal transmission operation (when the text contains an erroneous message)
(5) When BCC code is included
(6) When the IJ printer power is OFF
No response will be returned for any code transmission from the external decice.
(7) The printings, print specifications, print format, and user pattern data can be
consecutively transmitted in the following order in a single session.
Print format
Print specifications
Printings
2
1
3
(Example)
Print format
Print format
Print format
specification
specification
Print content
The user pattern can be positioned anywhere within the above data chain.
''Line count / print format uniformity'', ''Format setup change'', ''Free layout transmission'',
''Print item deletion transmission'' and ''Count reset transmission'' must be transmitted
independently. If an attempt is made to send it together with the other data, a communication
error (NAK response) occurs.
The print data recall must also be transmitted independently. Even if it is sent together with the
other data, no error occurs. However, the print data recall takes precedence, rendering the other
data invalid.
(8) Up to 3000 bytes of data can be transmitted at a time, including "STX" and "ETX".
If the 3000-byte limit is exceeded, a communication error (NAK response) occurs.
2
1