5 . HandshakingTable 15. Handshaking

 

 

Using

DTR

Using X-on/X-off

 

 

protocol

protocol

 

 

 

RS-232D

The signal at pin No. 20 is

Data transmitted from pin

 

as follows;

 

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

Data transmitted by the

 

with respect to pin No. 13

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

Data transmitted by the

 

pin No. 17 and pin No. 24

change of the impedance

 

is as follows;

 

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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