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.
558
questions
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-...
- 756
1
vote
0
answers
49
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 ...
- 77
0
votes
1
answer
36
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 ...
- 828
0
votes
2
answers
100
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
0
votes
1
answer
38
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 ...
0
votes
1
answer
83
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....
- 103
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 ...
- 1
4
votes
4
answers
2k
views
Could RS-232 data be carried over a standard 3.5mm audio/aux cable?
I am looking at RS-232 control for various TV displays which use a different type of input connector for RS-232. The combination of RS-232 inputs on different TV displays is the standard 9-pin DB9 ...
- 141
0
votes
1
answer
93
views
Odd behavior using the MAX3323EEPE to translate RS232 output to TTL logic levels
simulate this circuit – Schematic created using CircuitLab
I am using the MAX3323EEPE Maxim IC in order to attempt to take RS-232 output from a peripheral and shift it down to TTL logic levels ...
0
votes
1
answer
130
views
max3232 disconnection suddenly - problem
Hi I use a Max3232 chip to connect the RS232 between the microcontroller(STM32F103) and an HMI, the problem is that sometimes this connection will be disconnected and no longer work, this may happen ...
0
votes
2
answers
343
views
STM32 UART without HAL library
I am writing register level code for STM32F4 & in my code there is a timer for calculation of the frequency of an input signal.
I am trying to implement a UART for sending calculated data to ...
- 77
1
vote
2
answers
153
views
RS232 and RS485 sharing same wires
I'm planning a serial port that can either work as RS485 (half duplex mode) or as RS232 (configurable by the user).
There are several UART to RS232/485 chips around (like LTC2873), where a GPIO ...
- 7,697
0
votes
1
answer
35
views
Can TCC-100/100I Series Industrial RS-232 to RS-422/485 converters with optional 2 kV isolation convert RS485 to RS232? [closed]
I want to convert RS485 to RS232 to connect it to a Moxa Nport 5610 - 16 port RS-232 Ethernet serial device server.
Can I use a TCC-100/100I Series Industrial RS-232 to RS-422/485 converter to convert ...
0
votes
0
answers
105
views
Ethernet to UART (or RS232) conversion
For the PCB I'm designing, I need serial communication (1.8V UART, 3.3V UART, 5V UART or RS232, whichever is easiest) from an Ethernet connection (the devices connected to the Ethernet network will ...
- 7,697
1
vote
1
answer
327
views
RS232 : dedicated signal ground or common with power ground?
I'm designing the PCB for a robot, where I plan to add some connectors for external RS232 tools (provided by the client).
Each connector will provide power (either 24 or 48V, at 5A max) and an RS232 ...
- 7,697