Questions tagged [protocol]

A protcol is a ruleset for formatting and exchanging messages.

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Trying to control vintage amplifier (TEAC A-H500) with Raspberry Pi - what's the communication protocol? 8-bit bus?

I'm trying to control my vintage amplifier from Raspberry Pi - I want to create a nice little Spotify streamer that on playback start will automatically turn on the amplifier and set the input ...
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2answers
68 views

How many devices can be daisy chained via SPI/I2C?

How can we determine how many devices can be daisy chained from a datasheet
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58 views

What IR Protocol is this?

This was found on a window fan remote control. The fan is a Bionaire BW2300 It seems to have no AGC leader, 12 bits, my guess is each bit is either: ~420us on + ~1260us off ~1260us on + ~430us off
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234 views

Are there any advantages to an inverted serial prototocol?

Why would someone implement an inverted serial protocol? Are there advantages in doing so? One obvious disadvantage seems to be that an extra device needs to be included in a circuit if the ...
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121 views

Analyze protocol used for Futaba VFD display, 3 data pins

I take apart a Samsung SMT-C7140 HD Unit (made obsolete by cable company, a shame) and found a nice display that I could probably reuse. It is a Futaba GL07-00006A (13-BT-246GINK). I tried to find the ...
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59 views

Is there really a proper way to send private bits even 1 with CANBUS?

I was thinking of making an authentication protocol for canbus. Is there a way to send even 1bit privately to another node ? Have seen many implementations quite a few good ones. In particular ESA ...
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1answer
78 views

How to convert from 2 data line full duplex to 1 data line half duplex?

I'm trying to design a circuit that can convert from a two wire full duplex (think SPI), with one transmit line and one receive line, to a one wire half duplex (think i2c), with bidirectional ...
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36 views

HART Protocol - Logo/ Trademark details

Could you please share, advise any details on below. I am looking for details of HART trademark / Logo to add on my new product. Is it mandatory to have its logo on product, in datasheet? Where ...
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1answer
41 views

Some Physical Layers used with OBDII

I need to review some physical layers used in OBDII, a very common interface communication of vehicles and used as interface in a automotive scanners. I don't need exactly to know how the protocol ...
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1answer
45 views

Implement a data protocol between a smartphone and a MCU via NFC hardware?

If I'm able to develop a mobile app which is able to use the NFC hardware of a smartphone to write/read through it. And if I have a board containing a MCU and a NFC transponder like the IC from ST ...
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2answers
102 views

Right protocol for IoT embedded devices

I have a wall-powered embedded device that has several sensors. The MCU collects all sensor data, packages it and then sends it to an on-premise server through UDP. It is sending data every 100ms, ...
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61 views

PROFIBUS Architecture for Ultrascale +: experts' opinion request

I'm working on the design of a custom carrier board based on a Xilinx Ultrazed-EG SOM. Specifically, the Carrier (embedding the SoM) should realize the PROFIBUS DP master node in the specific ...
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47 views

What is the difference between SDA protocol and I2C?

A manual for Sound Design Technology's "DSP Programmer" programming box has the following statement: Hearing aids based on the Sound Design Technologies Wolverine platform can be programmed ...
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1answer
87 views

Simplex UART echo implementation on ATtiny

I'm currently trying to implement a simple UART echo application on the ATtiny85, with no additional pins other than RX/TX (no autoflow control). I'm using the Universal Serial Interface of the ...
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1answer
169 views

Generating analog signal (PPM) Raspberry Pi

I am trying to generate a PPM signal like the one used by RC receivers, using a raspberry pi. I am using the pigpio library. Here's what I have so far. Here's the header file: ...
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1answer
60 views

Interfacing LIN bus with CAN

On the following figure, LIN is used to build subnetworks from a CAN bus: Is there any standardized way to interface these two buses (e.g. for addressing a LIN node from a CAN node)? I read an ...
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2answers
79 views

Please help me understand modbus communications

I'm just starting out with understanding how modbus works over a rs485 protocol. I've received a communication protocol document from a company that makes solar inverters. I want to send a command ...
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48 views

IEC 60870-5 General Interrogation Command

Recently I watched a video explaining communication protocol IEC 60870-5. The video states that the General Interrogation (GI) command takes the following sequence Master Station sends an ...
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2answers
109 views

What is RS-485 and MODBUS? [closed]

I understand the title seems too broad but it's a bit specific and I'm totally new to the communication stuff, so please bare with me. If the question is too broad, please provide some suitable links ...
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3answers
84 views

What makes a communication architecture/protocol faster than others?

Why is thunderbolt considered faster than other? Apart from the inherent channel properties which affect the speed of data propagation, what else determines the speed of data transfer? Of course more ...
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1answer
68 views

Why is a LIN cluster limited to 16 nodes?

It says everywhere that a LIN network can be made up of at most 16 nodes (1 master node and up to 15 slave nodes). The id field however is 6 bits long allowing for more than 15 slaves to be addressed. ...
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1answer
29 views

Pull up resistor selection for LIN bus

What exactly will happen if I use 1.2K ohms at LIN master node pull-up? Why does the LIN protocol spec recommend to use 1K typically?
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1answer
54 views

SDLC Frame Check Sequence details

In the Synchronous Data Link Control (SDLC) protocol, the frame contains a "frame-check-sequence" (a CRC). The protocol contains a number of other implementation details, such as NRZI encoding, and ...
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0answers
87 views

Can you help me improve this circuit design?

I'm a electronic noobie and for a school project I need to design a circuit that will then be connected to a micro controller. The aim of the project is to build a sniffer to decode a particular ...
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1answer
70 views

How to determine the length of the last data field in a SDO block transfer?

I've got a problem with the implementation of the CANopen SDO Block Transfer. The transmission is ok except the last block: ...
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1answer
201 views

I need help to understand a sniffer circuit schematic

I'm an electrical engineering students and for a school project I need to understand a circuit schematic. First, I will provide some context. The school project I'm working on is the modification of a ...
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39 views

Do modern PS/2 keyboards ignore the RESEND command?

Trying to understand how to correctly implement response to the RESEND (0xFE) command from keyboard host, I've made an experiment: at a certain time, when the (real) keyboard is sending its first byte ...
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1answer
686 views

Are USB protocol and connector free or are they patented?

For a hobbyist developing a device, certification is not pleasant. I am wondering if implementing USB in any way is patented or needs a certification? I am concerned about both protocol (USB-2,3) ...
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1answer
99 views

Can I run a DDR4 module at 50 MHz?

I haven't seen any restrictions about minimum clock, but I may have overlooked them. EDIT: The module is a Crucial CT4G4SFS824A, based (this is an informed guess) on 4Gb Micron 512 Meg x 8
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58 views

Wishbone B4 rule 3.55: Is this for a special case?

Rule 3.55 of Wishbone B.4 states: "MASTER interfaces MUST be designed to operate normally when the SLAVE interface holds [ACK_I] in the asserted state." I read this rule together with permission 3.35,...
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1answer
81 views

Is it possible to program a RFID tag like a microcontroller?

I am working on an RFID project. I want to be able to send specific messages between the reader and the tag or maybe perform my own protocols on it. Is there a type of tag that I can provide some sort ...
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0answers
204 views

How are MBIM transaction ID's supposed to be used?

Situation I am developing a product that will use this Sierra Wireless HL7618RD Cat 1 LTE modem. I am interfacing to the modem over USB using a small SoM running a Debian flavor of Linux. The modem is ...
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128 views

CLK signal on DAT0 line on SD protocol?

I'm facing some problems in the initialization stage of the SD protocol on a custom board, specifically when sending the ACMD51 command and reading the Status Card ...
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69 views

How does line encoding relate to bus protocols like SPI, serial, i2C, ethernet etc [closed]

I'm referring to line codes like bipolar, machester, miller etc... https://en.m.wikipedia.org/wiki/Line_code How do these line codes relate to bus protocols? Is it another level down? Is it ...
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1answer
164 views

How to best use SPI (master/slave)?

This is a follow/new insight regarding my previous question Messages for SPI protocol. One idea from that question is to use the SS line to know a new message is being sent from the master to the ...
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2answers
92 views

Questions regarding messages for SPI protocol

I want to use the SPI protocol to communicate between an STM32 and Arduino. So I made up some message structure where the first byte is the 'command' byte, and data bytes following. The number of ...
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1answer
157 views

Signal filtering, what's wrong with the circuit?

I have this circuit where I receive a protocol signal: The +L_IN signal is this: This signal has a 28V DC voltage. The signal at ...
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2answers
129 views

Extremely low data rate transmission over long distance for attinys

For a lighting project I need to be able to trigger 20 units every couple of seconds independently which are daisy chained with 1-2 m space between each of them like so: Control station ====== Unit 1 ...
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1answer
348 views

What happens when there is a simultaneous Read and Write launched to the same address in AXI3/4?

I have a doubt regarding the AXI3/4 protocol. Assume a hypothetical scenario where a single master issues a valid Read and Write transaction to the same address simultaneously. From the AXI ...
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1answer
74 views

Bit-Map vs ALOHA protocol

So i have been reading about ALOHA and Bit-Map protocols and i am note sure which is more preferable in the following scenario: 8 stations, numbered 0-7 want to transmit in any given time slot. ...
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3k views

How fail-safe is \n\r as stop bytes?

In my UART communication I need to know the start byte and the stop byte of the message sent. The start byte is easy but the stop byte, not so much. I have implemented two stop bytes at the end of my ...
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1answer
191 views

How to monitor one wire “kind of” protocol

In the current network, there's 1 master device, which gathers data from over 20 devices. Nameplate says the baud rate is 2400. In the bus cable there's one data wire, 12V and GND. A friend of mine ...
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1answer
49 views

Why always in communication protocols R/W configuration,Reading is configured by “1” and writing by “0”? [closed]

when a microcontroller communicates with another one via one of the communication protocols there is a configuration bit in a control register to choose whether to send(write) or receive(read) this ...
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1answer
64 views

Do I have to initialize Dali lamp somehow if I use broadcast commands?

I have few Dali lamps. Some of them are new, some of them are used. It is hard to tell which was initialized (addressed?) and which was not. I have simple DALI circuit with microcontroller and simple ...
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1answer
405 views

MQTT Broker vs Server

I am trying to learn MQTT technology. What I understand so far, is that MQTT is based on a 'Broker' that does the 'Publish and Subscribe' of messages and topics. I wonder if it's another name for '...
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4answers
67 views

Video Protocol Without Required Speed

I am trying to output a video signal with a slow microcontroller (Arduino). I don't need anything fancy like HD or 30fps, and if it takes a second to update the frame that is fine. I was looking for ...
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1answer
138 views

Problem with SPI wiring?

Searching for images of SPI wiring between Master and Slaves, I found that some of them connect MOSI/SDI of master to MOSI/SDI of slaves and so MISO/SDO of master with MISO/SDO of slaves, meanwhile ...
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1answer
74 views

Using UART chip without programming control registers

Is it possible to use a UART chip without programming control registers? In other words, with Factory Default configuration? If yes, which ones? UART - SPI mode. I have examined the datasheet for ...
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1answer
179 views

Identify this open collector serial protcol

I'm trying to analyze the serial link between two devices, respectively a motor controller board and a Li-Po battery manager, which battery powers both devices. The application is a battery-powered ...
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2answers
3k views

How do universal IR remote “codes” work?

It is easy to find this kind of reference when searching for IR protocols and codes for specific equipment. The actual IR transmission contains far more data than these small codes can hold. What ...

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