Transmission Sequences; Common Transmission Sequences - Hitachi IJ RX2 Technical Manual

5.3 Transmission Sequences

5.3.1 Common Transmission Sequences

(1)Basic transmission operation.
1
When ENQ and ACK are present:
External device
IJ printer
When ENQ is omitted:
2
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
area switched)
External device
IJ printer
(3)When the IJ printer is incapable of receiving data or is off-line
External device
IJ printer
(4)Abnormal transmission operation (when the text contains an erroneous message)
External device
IJ printer
(5)When BCC code is included
External device
IJ printer
(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.
1
Print format
2
Print specifications
3
Printings
(Example)
The user pattern can be positioned anywhere within the above data chain.
''Line count / print format uniformity'', ''Format setup change'' and ''Free layout 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.
5-6 ●Transmission Sequences
ENQ STX
ACK
STX
DC2 ENQ
ACK
ACK
ENQ
NAK
ENQ STX
ACK
ENQ STX
ACK
Print format Print format
Text
ETX
Text
ETX
Text
STX
Text
ETX
Text
ETX BCC
Print
Print format
specification
ACK
ACK
ETX
ACK
NAK
ACK
Print
Print content
specification