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With the
status
flag set and data reception prohibited,
the vacant
area
of the buffer gradually increases as the
printer continues to
print.
When the vacant area for
bytes reaches the preset recovery value
(see
Table 12),
the flag
is
reset and
data
entry
is
again enabled.
Buffer
Operation
Disabled
Under this condition, the flag
is
output from the DTR
(pin No.
20)
in
the case
of
RS-232D, from the TRA and
TRB
(pin No. 11,
13)
in
the case of RS-422A, and from
the TTY-TXD (pin No.
17)
in
the case of Current Loop.
When DIP switch 3-l
is
ON (buffer
is
disabled), flag set
timing
is
set to 16 bytes and flag reset timing
is
set to 32
bytes.
Table 12.
Flag
set/reset
conditions
DTR Handshaking
Flag
is
set
RS-232D:
negative EIA
(not ready
to
level
accept data)
RS-422A:
negative EIA
level
TRA-TRB,
TRA:
inverted
TRB:
noninverted
20-mA
Current
Loop:
low
impedance (Current
on)
Flag
is
reset
RS-232D:
positive EIA
(ready to
level
accept data)
RS-422A:
positive EIA
level
TRA-TRB
TRA:
inverted
TRB:
noninverted
20-mA
Current
Loop:
high
impedance (Current
off)
X-on/X-off handshaking
Transmitting
X-off
character
Transmitting
X-on
character
19