Questions tagged [protocol]

A protcol is a ruleset for formatting and exchanging messages.

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49 views

Rinnai water heater power and communication interface/protocol

My Rinnai tankless water heater can be connected to a wifi module that controls the recirculating pump and other functions. The only connection between the PCB of the water heater and the external ...
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1answer
202 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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1answer
59 views

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
70 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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59 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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2answers
242 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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139 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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1answer
41k views

How do volume control headphones work?

A recent question over on Android Enthusiasts got me to wondering how volume control headphones work. I don't mean volume control which works by attenuating the incoming signal, but the kind of ...
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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
79 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
43 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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1answer
252 views

What kind of communication protocol is this?

I'm trying to reverse engineer the communication between two modules, a master and a slave, but I couldn't figure out the used protocol. All of the signs use 5V. The blue sign's frequency is 400 kHz. ...
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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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0answers
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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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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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
188 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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94 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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2answers
110 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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4answers
32k views

LVDS vs MIPI, what's the difference?

What are the practical differences between LVDS and MIPI? A little background information: I am attempting to build my own projector on the cheap and want to use a nexus 10 LCD panel (2560 X 1600 ...
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4answers
162 views

Soil moisture sensor interface protocol

I want to get some measurements from a soil using a simple soil moisture sensor like this one: It has an analog output proportional to soil moisture. The goal is to send the measurements through Sub-...
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2answers
81 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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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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3answers
1k views

How does this fire alarm system transmit data on two-wire?

In the fire detection industry, analogue addressable systems use control panels and detectors (and devices such as interfaces) which communicate with each other by means of a protocol. What protocol ...
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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
71 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
61 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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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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2answers
257 views

Can I guess 5/3-wire RS-232 pins from voltages?

Objective: interface to an HPLC pump via the RS-232 interface described in the manual. Communication protocol is well described. Pinout is not described at all. Can I guess the pinout based on ...
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1answer
74 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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0answers
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
642 views

DMX512 packet issue (no break?)

I'm not sure if I'm reading this wrong or something, but this is a trace of the DMX packet that's coming from my USB-RS485 module then being converter to UART logic levels for my microcontroller. ...
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2answers
4k views

Is there a standard I2C/SM bus protocol for laptop battery packs

I'm building a laptop with a custom battery pack. I know that the pack has to communicate through an I2C/SM port on the motherboard, but I don't know how to make the bios/os recognize it. Is there a ...
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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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1answer
87 views

Local Interconnect Network(LIN) default status

How does slave identification takes place in LIN protocol by the master ? What is the default status of a LIN bus ? How are collisions avoided in LIN ? What is the role of Sporadic frame ?
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1answer
771 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
101 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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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
213 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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2answers
70 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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138 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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1answer
166 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
95 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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4answers
868 views

Using CAN bus tranceivers with custom data link layer

We needed a noise immune, low cost, multidrop, multi master (realtime and distributed) protocol and there is only CAN bus seems to meet with these requirements. Since there are no can controllers (...
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681 views

The use of redundant I2C in spacecraft avionics

I recently read this report about the JPL x2000 avionics development project, which developed more modular avionics platform using commercial silicon, to cut cost and power. They opted for an ...

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