Hitachi IJ RX2 Technical Manual page 105

(e) When a data transmission is aborted (the transmission of up to the ETX
● The IJ printer printings remain unchanged. For data retransmission, perform either of the following
procedures.
Transmit the DC2 (retransmission) code to the IJ printer.
1
Press the Comm On/Off buttun to enter the off-line mode, and then switch back to the on-line mode.
2
(2) In overwrite-enabled mode
Off-line
ENQ
External
device
IJ printer
NAK
(No signal output)
Not ready
Readiness
for
for reception
reception
Print start signal
Printing
operation
(a)
(a) When the IJ printer is off-line
● The NAK code is transmitted in response to an ENQ code reception from the outside..
(b) When the IJ printer is on-line
● Transmission data is received from the external device. When it contains no error, the ACK code is
transmitted. In this instance, the "ready for reception" state is maintained.
● If the data transmitted from the external device is in error, the NAK code is transmitted after receipt of
the ETX code.
In this instance, retransmit the data beginning.
(c) Data retransmission
● Transmission data is received from the external device, and subsequent transmission data is accepted.
In this case, the received data is accepted even if the DC2 (retransmission) code is not attached.
(d) Printing during reception
● While data is being received from the external device, the previously printed contents are printed.
(e) Transmission data received from the external device
● Error-free transmission data is stored in the IJ printer. The same contents are printed until different
transmission data is transmitted to the IJ printer.
(f) When a data transmission is aborted
(the transmission of up to the ETX code is not completed)
● The IJ printer printings remain unchanged. For data retransmission, perform either of the following
procedures.
1
Transmit the DC2 (retransmission) code to the IJ printer.
Press the Comm On/Off buttun to enter the off-line mode, and then switch back to the on-line mode.
2
On-line
STX
STX
ENQ ETX ENQ ETX
B
A B
ACK ACK
ACK ACK
Ready for
reception
A
(b)
STX
ENQ
ENQ STX
ETX
C
D
ACK
ACK ACK
C
(c) (d)
DATA ETX
ACK
C
D
D
(e)
●Communication Timing 5-49