Questions tagged [rs232]
RS-232 is the electrical standard used on most serial ports. Note that this standard is a +/- 15 volt system and requires a FDMI converter to make it compatible with TTL logic levels.
559
questions
0
votes
3
answers
70
views
Powering a device from the RS485 lines
I have found multiple RS232 to RS485 converter dongles (from different brands, models, and makes) that do not need external power to operate.
Connect the RS232 DB9 on one side, and three wires for the ...
- 4,501
1
vote
1
answer
74
views
RS232 Noise problem
I designed an stm32mp1 mpu based pcb. When I connect from the m4 core and send the uart message, everything is as it should be. However, when I start the first stage bootloader from the a7 core, a one-...
- 159k
1
vote
0
answers
50
views
RS232 isolated communication via MAX3250
I have a two diffrent boards. One of the board is send the SoC and other things to Charger Board. While charging progress starts I want to isolate this to device because battery ground is isolated to ...
- 27
0
votes
1
answer
38
views
Split RS232 RX line on 3 interface
I have a device that sends data (telemetry) over an RS232 serial port. The RX line is not used, this device only sends one string every second.
I need to read this data from 3 different devices, each ...
- 159k
0
votes
2
answers
105
views
Why does RS-232 Communication fail between these 3 ESP32's?
What's the Goal?
Trying to get two esp32's to communicate over their UART lines using RS-232.
My initial inspiration and idea for the connections was based on
https://esp32io.com/tutorials/esp32-rs232
...
- 117
1
vote
7
answers
12k
views
Retrieving data from Agilent 34401A Digital Multimeter over the RS232 interface
I want to interface Agilent 34401A Digital Multimeter over the RS232 interface. The settings (baud rate, parity, number of start and stop bits) are set to be same on multimeter, pc (device manager) ...
0
votes
1
answer
39
views
Proximity sensor (3 Wire NPN or PNP) to RS-232
I do have 2 proximity sensors (level sensors) with 3 wire design. They offer to be PNP or NPN and I need to implement them into an RS-232. They are supplied by 24 VDC. Is there somewhat like a ...
- 7,119
33
votes
2
answers
96k
views
What are the differences between USB and RS232?
Can someone tell me why people use either USB or RS232. They are both serial ports, right? And I understand that USB is much faster (especially USB3.0) but if people wanted too I'm sure they could ...
CommunityBot
- 1
0
votes
1
answer
84
views
Convert RS232 signal to USB
I have an optical amplifier that uses RS232 and I want to convert to USB. I've purchased this chip, also here. There is little documentation on this chip and the supplier hasn't responded to questions....
- 9,270
1
vote
1
answer
238
views
Convert RS232 signal to I2C/CAN/MAVLink signal
I have an airspeed sensor that outputs a RS232 signal: https://www.aeroprobe.com/micro-air-data-system/. I want to connect this sensor to the Pixhawk in order to use the data for my controller ...
CommunityBot
- 1
0
votes
1
answer
540
views
ESP32-S3: Serial stops working after a random period of time
I am using a ESP32-S3 Dev Kit (Arduino code) connected to a MAX3232 to read data from a solar inverter. I am facing a strange problem as follows:
The UART (Serial1, ...
CommunityBot
- 1
0
votes
1
answer
231
views
Why does the data observed on a UART/RS232 bus look different between a logic analyzer and an STM32 Debugger?
I'm trying to communicate with a BNO055 using an STM32L552ZET6Q microcontroller via UART. The BNO055 is on a separate board, and connected to the STM32 via a 1.5M cable. Additionally, there are ...
CommunityBot
- 1
0
votes
1
answer
42
views
What do the different LED lights indicate on a DB-9 tester and what can I infer from them? [closed]
I have a machine with an RS-232 port. When I power ON the machine and connect the DB-9 tester all the machine's troubleshooting guide requires is to check if the RTS light is green. I see there are ...
- 159k
1
vote
1
answer
275
views
RS232 DCD over Serial-USB Adapter
I've been reading about PPS in linux and GPS synchronization.
I stumbled on some sources recommending using a USB GPS, I'm nto quite sure I understand how the interrupt signal is passed through.
The ...
CommunityBot
- 1
2
votes
1
answer
598
views
Transmitting through IRDA as if its a native serial port. Possible?
I'm currently making a lazertag project that utilizes the standard UART data format for data I/O.
Before I go make up another circuit board that connects a photo-transistor that senses a laser beam ...
CommunityBot
- 1