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
Содержание ELECTRONICS EXPERIMENTS BOX
Страница 4: ......
Страница 251: ...253 Fig 3 27 Circuit 27 4 seconds switch off delay Fig 3 28 Circuit 28 20 seconds switch off delay...
Страница 258: ...260 Fig 3 42 Circuit 42 Active 8 5V battery monitor Fig 3 43 Circuit 43 Active 7 8V battery monitor...
Страница 260: ...262 Fig 3 46 Circuit 46 Meters for 1 5 V Zener diodes and higher Fig 3 47 Circuit 47 Discreet 2 2V Zener diode...
Страница 261: ...263 Fig 3 48 Circuit 48 Discreet 2 9V Zener diode Fig 3 49 Circuit 49 Discreet 3 7V Zener diode...
Страница 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Страница 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Страница 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Страница 290: ...292 Fig 3 118 Circuit 118 HF watch dog with LED indicator Fig 3 119 Circuit 119 HF watchdog with moving coil instrument...
Страница 295: ...297 Fig 3 130 Circuit 130 4 seconds switch on delay Fig 3 131 Circuit 131 15 seconds switch off delay...
Страница 298: ...300 Fig 3 136 Circuit 136 NAND gate with moving coil instrument Fig 3 137 Circuit 137 Input level Mixing console...
Страница 300: ...302 Fig 3 140 Circuit 140 Electrometer with moving coil instrument Fig 3 141 Circuit 141 Simple AM Radio...
Страница 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
Страница 324: ...326 Fig 3 202 Circuit 202 3 seconds switch on delay Fig 3 203 Circuit 203 7 seconds switch on delay...
Страница 325: ...327 Fig 3 204 Circuit 204 Piercing siren sound with Piezo element Fig 3 205 Circuit 205 Discrete Operational ampli fier...
Страница 328: ...330 Fig 3 210 Circuit 210 Discreet 5 2V Zener diode Fig 3 211 Circuit 211 Discreet 7 4V Zener diode...
