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5. Handshaking
Table 15. Handshaking
RS-232D
Using
DTR
Using X-on/X-off
protocol
protocol
The signal at pin No. 20
is
as follows;
Data transmitted from pin
No. 2
is
controlled as
MARK-data
transfer follows;
disabled
X-on
(11H)—data transfer
SPACE-data
transfer enabled
enabled
X-off
(13H)—data transfer
(Signal
polarity can be
disabled
inverted by DIP-switch
setting.)
RS-422A
The signal at pin No. 11
with respect to pin No. 13
Data transmitted by the
differential voltage
of
pin
is:
No. 9 to pin No. 10
is
MARK-data
transfer controlled as follows:
disabled
X-on
(11H)—data transfer
SPACE-data
transfer
enabled
enabled
X-off
(13H)—data transfer
(Signal polarity can be disabled
inverted by DIP switch
setting.)
Current
Loop The impedance between
pin No. 17 and pin No. 24
Data transmitted by the
is
as follows;
change of the impedance
between pin No. 17 and
LOW (MARK)—data
pin No. 24
is
controlled as
transfer disabled
follows;
HIGH
(SPACE)-data
X-on
(11H)—data transfer
transfer enabled enabled
(Signal
polarity can be
X-off
(13H)—data transfer
inverted by DIP-switch disabled
setting.)
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