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Modem Interface
Bar Code Reader Interface
Pin
No.
1
2
3
4
5
6
7
8
Modem Interface
Symbol
TL
GND
R x MD
R x MC
T x M C
VDD
T x MD
RP
Description
Conventional
Telephone Unit
Logic GND
Direct Connection
to Tel Line
(RING)
Acoustic Coupler
Connection (MIC)
Acoustic Coupler
Connection
(Speaker)
RD for answering
telephone
Direct Connection
to Tel Line (TIP)
Ringing Pulse
Pin
No.
1
2
3
4
5
6
7
8
9
Bar Code Reader
Symbol
N C
R x DB
N C
N C
GND
N C
GND
N C
VDD
I
o o
\
o o
I • '
Description
Receive data from
bar code reader
Ground
Ground
O
G
O
))
o o
/
• • JJ
References / 61
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