All Questions
41
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 ...
- 832
1
vote
2
answers
157
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
1
answer
122
views
Modbus ASCII messages delimiter
I need to implement Modbus messages reception over UART. For RTU it's easy because UART on my uC has configurable idle receive line detection. However, for ASCII the task is tricky - the delimiter is ...
- 11
0
votes
1
answer
114
views
How to switch between multiple signals
I have a board that has a MAX232 and a MAX485. I want to switch between these peripherals' RX/TX signals which connected to Arduino. How would I achieve this?
I am definetly not knowledgeable about ...
1
vote
2
answers
1k
views
Is it possible to use an RS232-USB cable (with an FT232RL chip) for RS485-USB communication?
I have a standard RS232 to USB cable found on Amazon.
It does not work out of the box. This is what I expect since RS232 uses a ground reference and RS485 uses a differential between the two data ...
- 51
1
vote
3
answers
1k
views
RS-485 communication with slave microcontrollers driving addressable LEDs?
I am trying to figure out how to achieve the master-slave configuration shown below.
The aim is to individually address an array of 150 mA LEDs, driven by the IS31FL3265A PWM driver. For this specific ...
- 73
0
votes
2
answers
465
views
Bi-Directional RS-232 / RS-485 translator using MAX3162 IC [closed]
I'm trying to communicate with an I2C bus using the Serial Card in my PC (NI PCI485/8). I've created a circuit using the MAX3162 to translate from RS485 to RS232. Then I use the MAX3232 as a level ...
- 11
0
votes
1
answer
2k
views
Sniffing an RS-485 communication
I am trying to sniff a serial communication between two devices. One of them sends a command (6 bytes + 2 bytes CRC),
the other one responds (4 bytes + 2 bytes CRC). My computer monitors the exchange ...
2
votes
3
answers
3k
views
Why single ended signal line is not immune to noise in RS232?
In single ended signal line the measurement is the difference between the signal and the ground. Isn't this way of calculation make it differential?
Almost all the resource I have read says that ...
- 71
0
votes
2
answers
769
views
1-channel GPIO from industrial PC over RS232 port
I am ordering a computer based on 4x4-R1000V motherboard (Ryzen Embedded, https://www.asrockind.com/overview.asp?Model=4X4-R1000V) for an industrial application.
I need a 1-channel GPIO (0 for zero, >...
- 167
1
vote
1
answer
567
views
Modbus RTU over RS232 link
I am designing a convertor board that will interface three device with Modbus RTU RS232 port to a Modbus RTU RS485 network.
Slaves supports Modbus RTU, but their ports is different from master port.
...
- 446
0
votes
1
answer
189
views
RS-232 to RS-485 transceiver
I'm new in communication protocols and ICs. I would like to know if it is possible to connect a RS-232 (TX, RX and GND) to a RS-485 (Vcc, A, B and GND). I only need a half-duplex communication. The ...
0
votes
1
answer
111
views
How to identify 422 or 485 bus from the PCB
I have a very old CPU card, maybe 1980's. It has following chips on it and most probably these are used for communication with the rest of the system.
SN55188 Quad Line Drivers
SNJ55189 Quad Line ...
- 1,479
2
votes
1
answer
5k
views
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