Transmission Control - Hitachi PH Instruction Manual

6.4.6-2 Transmission control

ASCII Name
STX
(02)H
(start)
ETX
(03)H
(end)
ENQ
(05)H
(enquiry)
ACK
(06)H
(acknowledgment)
SO
(0E)H
(shift out)
SI
(0F)H
(shift in)
DLE
(10)H
(start of item)
DC2
(12)H
(retransmission)
DC3
(13)H
(retransmission)
NAK
(15)H (negative
acknowledgment)
ESC
(1B)H
(start of header)
Description
Code that is transmitted immediately before text.
Code that is transmitted immediately after text.
This enquiry code is used when the external device checks
whether the IJ printer is ready for signal reception. This
code must be transmitted before data transmission to the IJ
printer. When the IJ printer is ready for reception, the
"ACK" code is transmitted after ENQ code reception. If the
IJ printer is not ready for reception, the "NAK" code is
transmitted..
When the IJ printer is ready for reception, it transmits this
1
code in response to an "ENQ" code reception from the
external device.
This code reports that text reception is normally
2
completed.
When the 1-byte transmission mode prevails, this code is
positioned at the end of 2-byte code for transmission
purposes.
When the 1-byte transmission mode prevails, this code is
positioned at the beginning of 2-byte code for transmission
purposes.
This code is positioned at the beginning of printings for
each print item for transmission purposes.
This code is transmitted if the printings need to be changed
before the printing of the contents transmitted to the IJ
printer while the overwrite-protected mode prevails. After
receipt of this code, the IJ printer transmits the ACK code
and becomes ready for reception.
However, if the IJ printer is off-line, the "NAK" code is
transmitted.
The same as DC2.
However, when receiving DC3, the IJ printer terminates
printing forcibly.
1 The IJ printer transmits this code if it is not ready for
reception when it receives the "ENQ" code from the
external device.
2 This code reports that text reception is not normally
completed (when, for instance, the received data is in
transmission error or an unregistered print data number is
received)
This code is positioned at the beginning of a header for
transmission purposes. The header is a code that recognizes
the transmission data type and is transmitted next to STX.
● Transmission Sequences 6-31