174
2.71 RS232C monitor
Circuit 148:
Simple RS232C monitor
Setup information
Install the two diodes and the two resistors as shown in
Fig. 2.148.
The two wire jumpers are next. Check
the placement on the board again.
Components required:
1 x red LED, 1 x green
LED, 1 x 1 k
Ω
resis-
tor, 1 x 2.2 k
Ω
resistor,
1 x breadboard
Fig. 2.148:
Simple RS-232C
monitor
Experiment
It is still used in systems, where PCs are utilized to control machines such as: the serial interface RS-232C
of a computer from the days of infancy. If you would like to connect an CNC milling machine or one of the
unrivalled practical PSION pocket computers (s3mx or s5mx), this present circuit can help to overcome
connection issues. If connected to the pins RxD (receive direction) and TxD (send direction), the red LED will
signal a positive voltage level. This corresponds to a Logical Zero. Likewise, the green LED stands for a nega-
tive voltage level, thus, a Logical One.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.148.
Circuit 149:
Pin assignment of the RS-232C interface
Setup information
The pin assignment of the RS-232C interface is shown for the 9-pin connector, which is often used.
Components required:
none
Fig. 2.149:
Pin assignment of the
RS-232C interface
Summary of Contents for ELECTRONICS EXPERIMENTS BOX
Page 4: ......
Page 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Page 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Page 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Page 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
