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CBM-270 User’s Manual
CITIZEN
39
7
77
7.
..
.3
33
3I
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
7
77
7.
..
.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
Serial received data signal. If a framing error, overrun error, or parity error takes place,
the relevant data will be printed as "?".
(2) DTR
Write the data or a command when this signal is Ready. If you write at Busy, the previous
data will be ignored, resulting in an overrun error. The data can be written in the input
buffer even during printing. Busy is also issued at power-on, during test printing, at on-
line, or at reset.
(3) TXD
If the remaining capacity of the input buffer comes to 128 bytes or less while receiving the
data, DC3(13H) will be output as a data not receivable signal. If the remaining capacity
comes to 256 bytes or more, DC1(11H) will be output to the host side as a data receivable
signal.
When sending the status information, it is confirmed that DSR is a space prior to sending
the data, if DTR/DSR control has been selected. If DTR/DSR control has not been selected,
the data will be sent, ignoring the DSR signal.
(4) FG
Ground for the case
(5) GND
Common ground for the circuits