uk1980070772.pdf

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RS 232-interface
Connecting peripheral equipment to
computers is all very well provided
the signal levels are compatible.
This is not always the case and often
some form of interface, to convert
the signals from one level to another,
has to be added. Certain require-
ments have to be met as the output
signals of most peripheral equipment
conform to the RS 232/V 24
standard.
The interface shown in the circuit
diagram is intended for use with
the Junior Computer (PA7 and
PBO
refer to the series input and
output of the JC), but it can also be
used with any other computer. The
signals are converted to TTL from
the RS232 level by transistor T1
and from TTL to RS232 by N1 and
IC2. The latter are converted to a
level of 24
Vp-p.
6 k ... 8 k
internal pull up
• SV
OV
RS 232
connector
T1
PA7
BC 547B
1
2 34 7
FULL/HALF
DUPLEX N:
SI
Ni' IC1.1 7401
12 V
02V
PBO
-12V
80601
12V

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