All Questions
Tagged with transceiver rs485
17
questions
1
vote
3
answers
442
views
Do I need to put a ferrite bead near a RS485 receiver device power pin?
I'm using a MAX3094ECSE+ RS-422/485 receiver receiver datasheet for an application that is receiving quadrature encoder wires. Those wires are power, positive and negative signals from quadrature ...
- 851
1
vote
1
answer
54
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What is the operation of this RS485 transceiver having this connection?
I am confuse with the R1 and R2 function. The "Direct Connection" wire is connected to another transceiver's DE/RE.
When the DE/RE is high, driver is enabled, and when the DE/RE is low, the ...
- 11
0
votes
1
answer
250
views
Can USB-to-SERIAL dongle be used to drive an RS-485 transceiver?
Pictured below is a simple arrangement used to read the Temperature sensor from the PC. Standard/Protocol is MODBUS RTU RS-485 Half-Duplex.
I've used this arrangement with both modpoll.exe and ...
- 109
1
vote
3
answers
1k
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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
2
votes
2
answers
1k
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Maxim MAX3485ESA+T vs SP3485EN-L/TR
I have a question about the MAX3485ESA+T RS485 Transceiver.
I ordered a PCB with a MAX3485ESA+T and the project doesn't work. The previous design was with a SP3485EN-L/TR and it worked well, but I had ...
- 31
1
vote
0
answers
195
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How to create an RS485-compatible line driver with an adjustable slew rate?
I need to make an RS485 compatible line driver, capable of 12Mbit/s with fast slew rate, but with the capability to reduce the slew rate to about 50ns rise/fall time when operating at lower bitrates.
...
- 786
0
votes
1
answer
490
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SN75176 with 3.3V
Can I connect the SN75176 RS485 transceiver with a 3.3V microcontroller? The datasheet says that it must be powered with 5V and all inputs / outputs are TTL, but I'm not sure since the minimum high ...
- 427
0
votes
1
answer
82
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withstand voltage of RS-485 Transceiver
i am working with a half duplex RS-485 Transceiver ic SP3485EN with 10Mbps Data Rate
datasheet :https://www.maxlinear.com/ds/sp3485.pdf
i actually want the maximum working voltage (Viom) of design ...
- 307
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 ...
1
vote
2
answers
2k
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Rs485 to UART convension
I need to send data from one PIC to another PIC by using RS485. As a protocol I use UART. However, I cannot be sure about RS485 transceiver and its circuit. I will be able to supply 5 V and according ...
0
votes
1
answer
154
views
SN65HVD3x (RS485 Driver) - Termination resistor
I want to use the SN65HVD31DR to connect two microcontrollers together. The connecting cable has an impedance of Z0 = 80Ω. According to the data sheet it is recommended to terminate the connection ...
- 285
1
vote
1
answer
1k
views
To Fail-Safe or not Fail-Safe on RS485/422 Transceiver
I'm stuck on a PCB design issue.
I'm designing a new PCB (Daughter board) that will plug (via DB15-F to DB15-M) onto another PCB (existing Mother board) and the design intent is to take (from the ...
- 481
4
votes
1
answer
3k
views
Current consumption for RS485 transceivers?
I am building a prototype that uses a RS485 BUS to communicate many devices and current consumption is a crucial part in this project. In order to set the communication up, I have been looking at ...
- 85
1
vote
1
answer
5k
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What is 1/8 unit load in RS485 communication?
Something I saw is 1/8 unit load. In that document, it states that RS485 will allow up to 256 transceivers on the bus by using 1/8 unit load. My question is, what is 1/8 unit load and how do I use it?
- 11
1
vote
0
answers
578
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Using same DB9 port for RS232 and RS485 (selectable) - looking for IC
Do any of you know of any transceiver ICs that can switch between RS232 and full or half duplex RS485? I'd like to be able to select which type of communication is used with either a jumper or input ...
- 841