All Questions
Tagged with rs232 serial-bus
11
questions
1
vote
1
answer
210
views
Raspberry PI4 and RS232 adapter cable: how to send serial commands
I would like to use a Raspberry Pi4 to control a syringe pump [(see datasheet here and in particular the quick start manual on page1)][1]
The connector cables I used are RJ11 from the Pump to RS232 (...
- 377
4
votes
2
answers
675
views
MAX232 IC does not convert to and form RS232 levels
I made a simple circuit to read data from RS232 lines and print data on different RS232 lines. This is the IC I am using: MAX3232EIDWG4. The IC fails to convert the CMOS to RS232 level logic.
I am ...
- 153
4
votes
2
answers
551
views
What was the communication protocol used on board the Apollo moon lander?
It seems that the development of TTL was contemporary ~1961 the maiden moon landing of the Apollo vehicle, while the development of one of the oldest digital signalling standards RS232 using the UART ...
- 265
2
votes
1
answer
5k
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RS422 and RS485; full-duplex or half-duplex?
I have extensively used RS232 transceivers in many projects and have fairly good understanding of UART communication using RS232 transceivers. MAX232 and MAX3232.
Now I have to build my understanding ...
- 1,479
0
votes
2
answers
1k
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RS485 vs RS232 similarity vs differences
I have used UART RS232 communication between MCUs extensively. Now I need to interface my STM32F407 MCU over RS485 bus with with devices. I have understood few things about RS485 but not-clear about ...
- 907
0
votes
3
answers
3k
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How to find out whether serial standard is RS232 or TTL when stated as "serial(RS232/TTL)"
I am recently moving from C programming into automation engineering. I have learned about RS232 and TTL standards, and I understand that they are based on the same concept of serial communication, ...
- 1
2
votes
1
answer
2k
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I2C bus extender
I am working on a project which requires a long I2C bus, which can be long as 200 m or more. I searched on the Internet and found a chip (NXP PCA9600). Is there any alternative to this chip, and if I ...
- 21
-2
votes
2
answers
482
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usb to rs232 serial communication
I have to configure my rs232 to device(transmitter) using usb to serial communication. I have tried with usb to rs232 cable and connect the transmitter 6 pins to the db9 connector but it did not work. ...
0
votes
2
answers
46
views
How to feed 2-state voltage into PC?
I have a simple circuit that generates +5V under normal conditions but goes down to 0 when something is wrong. I need to feed this voltage into a PC (running Ubuntu) and write a program to monitor the ...
- 103
2
votes
1
answer
2k
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Max 485 auto transmission
i am using Max232 and max485 to convert the RS232 pc data to RS485. I got a circuit using these ICs with a transistor and some resitor. circuit is such that RE and DE are short together and tied to ...
- 23
1
vote
1
answer
308
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Questions about an atmega32 serial-bus to RS232 with converter and different logic levels
I have an atmega32 and a FUM DCF-U atomic clock (signal receiver and decoder) of HKW-elektronik. The µ-controller works with 5V and the module on 3.3V.
I have to build a converter, because the µ-...
- 145