Hitachi IJ RX2 - Page 105

●Communication Timing 5-49
Print start signal
Readiness
for reception
(No signal output)
Not ready
for
reception
Printing
operation
A
C
C
D
On-line
Off-line
(a) (b) (c)
(d)
D
Ready for
reception
(e)
ENQENQ
NAK
ETX
STX
ACK ACK
ENQ ETX
STX
ENQ
ETX
STX
ENQ
ACK ACK
ACK
ACK
External
device
IJ printer
A
B
ACK ACK
ETX
STX
B
C
D
DATA
(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.
Press the Comm On/Off buttun to enter the off-line mode, and then switch back to the on-line mode.
1
2
(2) In overwrite-enabled mode
(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.
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.
1
2