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iDP-3420/3421/3423 User’s Manual
48 CITIZEN
10
1010
10.
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33
3I
II
In
nn
np
pp
pu
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t t
t a
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nn
nd
d d
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OO
Ou
uu
ut
tt
tp
pp
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t t
t S
SS
Si
ii
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gg
gn
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10
1010
10.
..
.3
33
3.
..
.1
11
1I
II
In
nn
np
pp
pu
uu
ut
t t
t a
aa
an
nn
nd
d d
d O
OO
Ou
uu
ut
tt
tp
pp
pu
uu
ut
t t
t S
SS
Si
ii
ig
gg
gn
nn
na
aa
al
ll
ls
ss
s
(1) RXD
This is a serial received data signal. When a framing error, overrun error, or parity
error occurs, that data is printed as "?".
(2) DTR
When this signal is Ready, write the data or a command. If written at the time of Busy,
an overrun error results, ignoring the previous data. The data can be written in the
input buffer even during printing. Busy is also issued at the time of power-on, test
print, on-line, and reset.
(3) TXD
XON (11H) or XOFF (13H) is sent at XON/XOFF control. XON (11H) is sent every 3
seconds in the STAR mode.
When a command is received, that requests the printer state and printer status, 1-byte
corresponding data is output.
(4) DSR
When this signal is a space, the data is sent from the printer side. Note that if this
signal is a mark when a request to send command is executed, the printer will wait until
the signal becomes a space.
(5) FAULT
1
CBM mode
When this signal is Space, a mechanical error has occurred.
2
STAR mode
When this signal is Mark, a mechanical error has occurred.
(6) RESET
A signal to reset the entire printer. (Negative logic)
(7) RTS
This signal is turned to Space when the printer is turned on.