Seiko FB-900 - Manual (Page 175)

(1) If the ONLINE key is pressed in the offline state and the
free area in the buffer is over the CIN value,
1) The printer sends X-ON and enters the online ready
state if it was in the ready state.
2) The printer sends no signal and enters the online busy
state if it was in the busy state.
(2) If the ONLINE key is pressed in the offline state and the
free area in the buffer is less than the CIN value, the printer
sends no signal and enters the online busy state.
(3) If the ready state is changed into the offline state by pressing
the ONLINE key and data is input and the free area in the
buffer exceeds the CIN value during data input even though
the printer has sent X-OFF once, the printer does not send
X-OFF.
However, if the printer receives the 64th byte of data after
entering the offline state, it sends X-OFF once.
(4) The printer sends X-OFF once if the printer enters the
offline state due to an out-of-paper error after initialization.
(5) In the X-ON/X-OFF (I) protocol, X-ON is output after
power on when initialization is completed and the printer
enters the online state.
● Serial interface
7-10 — 7. Interface specifications —
Special notes
READY
ON-LINE
BUSY
OFF-LINE
POWER ON
0 CIN CRN FULL
[OFF]
(OFF) (OFF) (ON) (ON)
[ON]
<OFF>
<OFF>
{OFF}
(X) (X) (X) (X)
<ON>
<ON>
: X-ON or X-OFF is sent once when the data size
changes.
: X-ON or X-OFF is sent once when the ONLINE
key is pressed.
: X-OFF is sent when the 64th byte of data is
received after sending X-OFF.
: X-OFF is sent when the free area in the buffer
becomes zero.
: X-ON is sent when power is turned on and the
X-ON/X-OFF (I) protocol is in use.
: No signal is sent. Status transition due to change
in the amount of data.
: Status transition caused by pressing the ONLINE key. [ ON][OFF]
(ON), (OFF)
{OFF}
<OFF>