Hitachi PH - Transmission Sequences

6-16 ● Transmission Sequences
6.4 Transmission Sequences
6.4.1 Common Transmission Sequences
(1) Basic transmission operation
ENQ
ACK
STX Text EXT
ACK
External device
IJ printer
(2) When DC2 (retransmission) code is used
(When no response is received though ENQ has been issued and
yet the contents of print are switched)
DC2
ACK
STX Text EXT
ACK
External device
IJ printer
ENQ
ACK
(3) When the IJ printer is incapable of receiving data or is off-line
ENQ
NAK
External device
IJ printer
(4) Abnormal transmission operation (when the text contains an
erroneous message)
ENQ
ACK
STX Text EXT
NAK
External device
IJ printer
(5) When BCC code is included
ENQ
ACK
STX Text EXT BCC
ACK
External device
IJ printer
(6) When the IJ printer power is OFF
No response will be returned for any code transmission from the external device.
(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
The user pattern can be positioned anywhere within the above data chain.
The overall column setup data 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.
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