Panasonic KX-P4440 - Manual (Page 140)

Signal Descriptions
F G ...F ram e G ro u n d
• F ra m e g ro u n d is th e sa m e as ch a ssis g ro u n d .
T X D ... T ra n sm it D ata
• O u tp u ts se ria l d ata to th e c o m p u ter. S P A C E in d ic ate s ‘‘0 ” d ata; M A R K
indicates “ 1 ” data.
R \D ... R e ce iv e D ata
• In p u ts serial d a ta fro m th e co m p u ter, S P A C E in d ica te s “0 " d ata;
M A R K in d ic ate s "1 ” d ata.
S G .. S ig n al G ro u n d
•C o n n ec ted to th e sig n a l g ro u n d o f th e p rin ter’s circu it b o a rd .
D T R ...D a ta T erm in a l R ea d y
•T h is sig n al is sen t to in fo rm th e c o m p u te r th at d a ta re ce p tio n is n o t
p o ssib le at th e p rese n t tim e , ev e n th o u g h th e p rin te r m ig h t b e o n -lin e.
P rin ter a n d c o m p u te r p o larities ca n b e m a tch e d th ro u g h th e fro n t p an e l
k ey o p eratio n s.
Protocol
T h is p rin ter s u p p o rts tw o ty p es o f p ro to co l: X O N /X O F F an d D T R . D T R
p ro to co l u se s a D T R sig n a l (b o th M A R K a n d S P A C E are selec tab le ) to
in d ic ate th e co n d itio n o f th e p rin ter, w h ile X O N /X O F F p ro to co l u ses an
A S C II c o d e co rresp o n d in g to X O N /X O F F .
D T R P ro to co l
W h e n th e in p u t b u ffer is red u c ed to less th a n 6 4 b y te s, th e p rin te r
in d ic ates th at d a ta re ce p tio n is n o lo n g e r p o ssib le b y se ttin g th e D T R . In
th is c o n d itio n , th e c o m p u te r is fo rc ed to sto p tran s m ittin g d a ta. S h o u ld
th e c o m p u te r co n tin u e tra n sm ittin g , a ll ex ce ssiv e d a ta w ill b e ig n o red b y
th e p rin te r.
X O N /X O F F P ro to c o l
W h e n th e in p u t b u ffer is red u c ed to less th a n 5 1 2 b y te s, th e p rin te r
o u tp u ts th e X O F F c h arac te r. W h en th is ch a ra cte r is o u tp u t, th e c o m p u te r
is fo rc ed to sto p tran s m ittin g d a ta. S h o u ld th e co m p u ter c o n tin u e tra n s­
m ittin g , a ll ex ce ssiv e d a ta w ill b e ig n o red b y th e p rin ter. T h e X O F F
ch a racter is a lso o u tp u t w h e n th e p rin te r is o ff-lin e . T h e X O N c h arac ter
is o u tp u t w h en th e p rin ter g o e s fro m th e o ff-lin e to th e o n -lin e co n d itio n .
X O N = 11 hex (17 dec )
XOFF=13 hex (19 dec )
6-72 Specifications