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CBM-270 User’s Manual
CITIZEN
41
7
77
7.
..
.3
33
3.
..
.4
44
4D
DD
Da
aa
at
tt
ta
a a
a R
RR
Re
ee
ec
cc
ce
ee
ei
ii
iv
vv
vi
ii
in
nn
ng
g g
g C
CC
Co
oo
on
nn
nt
tt
tr
rr
ro
oo
ol
ll
l
If DTR/DSR control has been selected, the data from the host side will be received when the
BUSY signal is at "Low," but not received when at "High." If DTR/DSR has not been
selected, the data from the host side will be received after sending XON, but not after sending
XOFF.
7
77
7.
..
.3
33
3.
..
.5
55
5B
BB
Bu
uu
uf
ff
ff
ff
fe
ee
er
rr
ri
ii
in
nn
ng
gg
g
To transfer the data to the input buffer, there are two control signals available: DTR signal
and TXD signal. The host side is immediately freed, since the data can be buffered up to 2
KB.
(1) DTR signal (See 7.3.1-(2))
(2) TXD signal (See 7.3.1-(3))
7
77
7.
..
.3
33
3.
..
.6
66
6E
EE
El
ll
le
ee
ec
cc
ct
tt
tr
rr
ri
ii
ic
cc
ca
aa
al
l l
l C
CC
Ch
hh
ha
aa
ar
rr
ra
aa
ac
cc
ct
tt
te
ee
er
rr
ri
ii
is
ss
st
tt
ti
ii
ic
cc
cs
ss
s
RS-232C Circuit
Input (RXD, DSR)
[Printer Side] [Host Side]
Output (TXD, DTR)
[Printer Side] [Host Side]
Equivalent to MAX232
Mark=(-8V): At Busy Mark=(-8V): 1
Space=(+8V): At Busy Space=(+8V): 0
Equivalent MAX232
RXD
Mark=(-8V): Stop bit
Space=(+8V): Start bit
TXD
DTR