A protcol is a ruleset for formatting and exchanging messages.
0
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0answers
27 views
PHYs, Protocol Stacks and MACs, where can I find a simple good tutorial that uses a simple protocol to teach these concepts
With modern communication standards like USB, Ethernet, PCIe there is a lot of complexity involved as data is recieved/transmitted. I want to understand the concepts of PHY; Protocol Stack that ...
-2
votes
0answers
108 views
What are all the chip-chip protocols that exist? [closed]
Ok, so we have SPI and I2C that can be used for low data rates. What if someone has lets say FPGAs with transceivers and wants to achieve high rate chip-chip data transmission? I know SerialLite and ...
-1
votes
1answer
74 views
How to determine infrared protocol using PIC16?
I am trying to determine the IR protocol used in a Gree room air conditioner remote control. I connected the output of the original IR receiver to pin RA5 of a PIC16F73 and used the following code to ...
-4
votes
1answer
62 views
How much max distance of SPI & USB & I2C and TWI(without any IC [closed]
How much max distance of SPI & USB & I2C and TWI(without any IC(my mean is directly)), and how can i amplify these?
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0answers
45 views
Why sometimes i should use RS232 (or another chip for another protocols)? [closed]
Why sometimes i should use RS232(or another chip for another protocols)?
1
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5answers
170 views
Good RS232-based Protocols for Embedded to Computer Communication
I'm working on a project that involves a good bit of data communication between a remote Arduino and a computer. The wireless connection is through a pair of XBees, so we have a RS232 link between the ...
-6
votes
1answer
74 views
Difference between Ethernet and USART? [closed]
As i made literal study about protocols, I came across lot of protocols and there differences but i'm not sure of what is the major merits of Ethernet over USART. lots of websites explained about all ...
0
votes
1answer
89 views
Ideal protocol to read parameters (ex Temperature, voltage, battery status of satellite) from STM32 microcontroller? [closed]
I'm working on an nano satellite project. The task assigned to me is in the Checkout-system module of the satellite.
A couple of parameters from the STM32 microcontroller which will be mounted on the ...
2
votes
2answers
136 views
Best microcontroller electrical bus for high speed synchronized sampling from slaves
I have an application which requires that I sample a dozen of sensors for each node and transmit the data to a master microcontroller in regular four second intervals. The surface area of the sensors ...
-1
votes
1answer
178 views
Connection between RPi and PIC [closed]
Before I start I would like to say that I'm a complete novice with microcontrollers and would like to be treated as one and receive answers acordingly... more like "Q: How many legs does a human have? ...
3
votes
2answers
57 views
Rationale for interleaving in G.709
According to the ITU-T G.709 (OTN) specification, a single frame has 4 'rows' and 4080 'columns' of octets, arranged like this:
...
-2
votes
1answer
110 views
Interpret answer of serial connection [closed]
I sniffed some package transfer via COMP1 (RS232) which I can not interpret.
As RAW data it looks like:
<00><08><44>@<45>@?<F8> ... ...
0
votes
4answers
204 views
I2C combining read and write operation
I'm designing my own data protocol for communication between PICs, ICs, etc. and in the specification I'd like to compare it to the existing I2C protocol.
There are two types of operation on the I2C ...
0
votes
0answers
124 views
open source project hosting tools specifically for hardware design? [closed]
Background
I'm finishing up on my senior project of home automation, and after the year of research I noticed there isn't any collaborative system for open source hardware for home automation, so I'm ...
1
vote
3answers
177 views
Why is the data output of some ICs in two's complement form?
I've been looking into some ICs now. Some of them have the calculated result (data) in twos complement form, placed in register to be read by other IC. What is the logic behind converting the data to ...
3
votes
3answers
120 views
Determining command constants for serial protocol design
It seems to happen fairly often that I'm working on a system that incorporates a serial (SPI or async) command set.
As such, I generally have to put together a set of arbitrary command byte values ...
2
votes
1answer
203 views
Bluetooth SPP (Serial Port Protocol) and Cobra Tag
I have been trying to build something similar to the Cobra Tag (Check out the video). I have written a prototype android app which uses SPP to connect to a bluetooth module and exchange commands, ...
2
votes
1answer
87 views
How do you make the LEDs come on for a PS/2 keyboard?
I'm making a simple console type thing for the mbed with a PS/2 keyboard and VGA monitor. I have a PS/2 library working and can receive scancodes and such. I want to go above and beyond what it allows ...
4
votes
1answer
2k 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 ...
3
votes
2answers
283 views
Sniffing USB traffic at the hardware level
I've been looking to purchase a USB sniffer that will parse packets at the hardware level. I've used usbsnoopy and the like, but a filter driver solution is not my ...
3
votes
2answers
84 views
What is the point of “software data protection” in a rewriteable ROM?
I've been considering trying to hack an old '98 era motherboard. The ROM(I presume for the BIOS) is a Winbond W29C020-70. In it's datasheet, there is a thing called "Software-protected Data Write". ...
3
votes
6answers
172 views
Hard drive that has the ability to “read” old data while it performs a write?
Is there a hard drive (protocol command, specific model, etc.) that, while writing new data over old data, it "read"/return the old data back to the controller/OS? (Analogous to a simultaneous ...
3
votes
2answers
273 views
XBee, how does it deal with collisions?
I'm getting started with XBEE S2 modules and I have a doubt I still couldn't get a clarification, hope you guys can help.
I want to have 2 end devices transmitting data to one coordinator, all of ...
2
votes
1answer
190 views
Understanding the OSI Model
I'm currently documenting a wireless, microcontroller-based system that I've built and I would like to use the standard industry terminology to help anyone who comes behind me comprehend it easier. ...
-1
votes
1answer
73 views
Industrial Networks [closed]
I have been trying o figure out the differences in the several fieldbus protocols used in control networks in industry, what are they?
1
vote
1answer
161 views
What is a multiplexed network?
What is a multiplexed network?
Multiplexing means many to one and sending the result over the network. As far as I know, Control Area Network (CAN) supports multiplexing. How?
CAN is said to support ...
-3
votes
1answer
1k views
AX.25 protocol using arduino [closed]
I am currently working my end task with the title implementing ax.25 protocol on wireless SCADA for tele monitoring microhydro power plant. the data will be send using RF transceiver (KYL 1020) with ...
2
votes
1answer
670 views
Can anyone identify this 433Mhz OOK protocol?
I am working with some wireless devices that use 433MHz OOK transmitters and receivers. They use a simple protocol for the data sent between the nodes. I feel it is reminiscent of common IR remote ...
1
vote
5answers
1k views
Internet vs Serial communication
Ok all the mouse movements, USB connections and other PC peripherals such as printers ect. are via what is called serial communication. One bit per time...
So far so good. But when it comes to TCP ...
1
vote
2answers
142 views
Data transmission : what is neutral current method?
I'm reading a book about data transmission inside a PC.
I'm trying to understand a phrase, translated from german, saying this :
In a PC, data are transmitted almost exclusively using the ...
2
votes
6answers
2k views
Manchester's protocol encoding
As I understand, in Manchester's protocol known bits are sent before start a transferring.
But I didn't understand why - One of the main benefits of Manchester, is the fact that sync between the two ...
3
votes
6answers
855 views
Is it possible to make a USB device that would alter mouse data on the fly?
I have a friend who is struggling to find mouse drivers/manufacturers that support various options for dyslexia. Inverting the X and Y axes are a simple feature that most programs and drivers are ...
2
votes
2answers
993 views
SIM card communication protocol
My board contains an STM32 (manual here) and a SIM card reader (manual here). I need to write drivers to test that the SIM reader is working an properly communicating with the STM32. However, looking ...
-1
votes
2answers
193 views
VSAT link between station A and B bandwidth is limited as QPSK modem 4096kps?
I'm finding it difficult to solve this problem and I am hoping y'all can help me with it. How can I optimize a VSAT link for maximum data throughput from a station A to B knowing that our measured ...
5
votes
2answers
311 views
Transmitting ASCII 'A' over SPI Protocol
I'm working on a project that involves connecting directly from the TRS jack of an iPhone to a SPI port on a microcontroller.
So the iPhone is the master and the microcontroller is the slave
So ...
1
vote
0answers
156 views
how to associate Xbee TxStatusResponse Frame ID to proper packet sent?
I am currently working on a xbee sensor with multiple input buttons. Each time one of them is pressed, I send a packet to the coordinator and wait for the TxStatusResponse before acting on it.
Each ...
1
vote
1answer
137 views
motion detected protocol
Is there a standard protocol for motion sensors, PIR sensors, etc. to tell parking lot lights, etc. that motion has been detected, so the lights need to turn on?
I'm not asking for protocols that ...
12
votes
1answer
1k views
Why are USB devices slower than 480 MBit/s
Motivation
With a signaling rate of 480 MBit/s USB 2.0 devices should be able to transmit data with up to 60 MB/s. However today's devices seem to be limited to 30-42 MB/s while reading [Wiki:USB]. ...
2
votes
4answers
311 views
Why buy protocol analyzer modules for an oscilloscope?
Scopes with logic analyzer inputs often have optional add-on modules that let them decode various serial protocols: SPI, RS-232, I²C, CAN, etc. Tek and Agilent want around
US $700 per protocol family ...
3
votes
4answers
160 views
Low cost/complexity bus for expandable modules?
I'm trying to pick a bus for an expandable system. Requirements would ideally include:
Unknown number of modules (potentially up to a couple dozen).
Multiple identical modules are allowed (giving ...
2
votes
0answers
305 views
UDS with more than eight bytes
The unified diagnostic services (UDS) protocol in ISO 15765-4 seems to be specifically designed for bus systems with a message length of eight bytes (for example, CAN). Now, new transport layers like ...
0
votes
2answers
365 views
Open Source version of MOST?
Is there an open source version of the MOST protocol?
From the above link:
MOST (Media Oriented Systems Transport) is a high-speed multimedia network technology optimized by the automotive ...
5
votes
2answers
654 views
Hart protocol implementation
I would like to implement the HART protocol and am searching for specifications of the protocol.
I found that the Hart Communication Foundation manages the protocol and on this page it says that
...
1
vote
2answers
861 views
J1939 Protocol?
I'm working on the J1939 PGB protocol.
In this protocol I didn't understand the word "parse PGN"
If any one can know about It then It will be very much helpfull for me.
Thanks In Advance.
1
vote
1answer
172 views
What is an INTERLOCK in J1939?
Hai I'm doing the project on J1939 Periodic Group Broadcast (PGB) protocol.
I had an document where it mentions the word "INTERLOCK".
I didnt get what is an INTERLOCK,First INTERLOCK,Second INTERLOCK ...
3
votes
3answers
743 views
Home automation protocols in Europe
Which protocols are used in Europe? I'm more interested in "higher layer" protocols (e.g. light bulb control) than with the physical layer, but those will be welcome too.
Does the KNX standard have ...
4
votes
1answer
140 views
Tradeoffs between transmitting and listening with low-power 2.4GHz
On a number of 2.4GHz chips, listening for a signal is actually more expensive than transmitting. If one is trying to minimize power consumption with such devices, to what extent should one strive to ...
3
votes
1answer
381 views
SPI and a Flash memory IC, the basics
In SPI, I have a few questions...
I understand how bits are clocked through, but how are bytes are delimited?
Is the slave select pin only required for turning the data output high impedance? Or is ...
2
votes
3answers
883 views
uart communication protocol
I'm working on a project where I have to communicate different lengths command from my PC to a microcontroller. (using usb to uart bridge)
I already make a litle protocol (start byte, some data, ...
3
votes
4answers
2k views
DSC Keybus Protocol
I'm plan to interface a atmel avr with my alarm system in home but the issue is DSC has a propriatary protocol between the keypad and the base. So has anyone messed with this before or can give me a ...
