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PDF General-purpose Serial Connection Guide (RS-232C

(1) Understand the specifications of devices which are used in the system Allow some margin for ratings and performance Provide safety measures such as installing a safety

PDF The RS232 Standard

Officially RS232 is defined as the “Interface between data terminal equipment and data communications equipment using serial binary data exchange ” This definition defines data terminal equipment (DTE) as the computer while data communications equipment (DCE) is the modem

PDF TP ISN

Configurer les paramètres de la liaisons série (débits nombre de bits de donnée) 5 3 Envoi d'un caractère puis d'une chaîne de caractères d'un ordinateur 

PDF 14 Serial communication RS232

Serial communication – RS232 A popular way to transfer commands and data between a personal computer and a microcontroller is the use of standard interface like the one described by protocols RS232 (older) or USB (newer)

PDF RS232 (Asynchronous Serial Protocol)

A clock signal is shared No longer have to assume that two clocks stay in phase Allows us to run the clock much faster than with asynchronous protocols Master/slave structure Master is responsible for producing the clock and any other control signals Potential for many devices to share a common bus

PDF RS232 Quick Guide

RS232 Quick Guide TIA/EIA-232-F Standard RS232 conveys data over a simple unterminated multiconductor cable at rates up to 20kB The RS232 standard specifies the electrical characteristics and connector for an all encompassing point-to-point modem interface

PDF Communication par transmission série RS232

– Configuration des paramètres de la liaison série (débit nombre de bits des données ) sur chaque poste – Envoi d'une chaîne de caractères d'un ordinateur 

PDF Serial Communications RS232 RS485 RS422

The most common serial communication protocols are RS232 RS485 RS422 USB and Ethernet But because USB and Ethernet require powerful interfaces with complex protocols many efficient devices utilized RS232 RS485 and RS422 which is what this note is all about Protocol Comparison Chart RS-232 RS-422 RS-485 Cable Single ended

  • C'est quoi le protocole RS232 ?

    RS-232, "Recommended Standard 232" est un ensemble de normes permettant l'échange d'informations entre un périphérique électronique et un ordinateur via une connexion D-SUB.
    Le RS-232 définit les conditions d'utilisation des circuits, les niveaux électriques et le brochage.

  • Comment communiquer en RS232 ?

    La transmission du protocole RS232 implique l'envoi de données bit par bit, sur une seule ligne de communication.
    En revanche, les communications parallèles nécessitent au moins autant de lignes qu'il y a de bits dans un mot en cours de transmission (pour un mot de 8 bits, un minimum de 8 lignes est nécessaire).

  • Pour gagner en immunité aux bruits et par le fait en qualité de transmission des données, la norme RS232 impose des tensions positives et négatives comprises entre 3V et 25V (en valeur absolue).
    Un niveau logique '0' est représenté par une tension de +3V à +25V et un niveau logique '1' par une tension de -3V à -25V.

  • Quelle est la configuration minimale d'une liaison cablage RS232 ?

    Selon la norme RS-232, toutes les données sont transmises dans une série temporelle de bits.
    Pour PC, la configuration la plus courante est la liaison asynchrone envoyant des paquets 7 bits ou 8 bits.

  • Niveaux de tension du RS232 Les tensions de ligne du RS232 sont comprises entre -25 V et +25 V. Elles sont appelées tensions de signal et tensions de contrôle. Une tension de signal comprise entre -3 V et -25 V correspond à un signal logique '1' tandis qu'une tension entre +3 V et +25 V représente un signal '0'.

    Synchronous Serial Protocols

    A clock signal is shared No longer have to assume that two clocks stay in phase Allows us to run the clock much faster than with asynchronous protocols Master/slave structure Master is responsible for producing the clock and any other control signals Potential for many devices to share a common bus cs.ou.edu

    Serial Communication with I2C (Inter-Integrated Circuit)

    Potentially many masters Unidirectional communication: only one device may write to the bus at any one time Only two signal lines: SDA: data transmission SCL: clock Some refer to this as a Two Wire Interface cs.ou.edu

    I2C Device Interconnection

    • Any device can be a master or a slave I2C Device Interconnection Pull-up resistors Devices only drive the SCL/SDA lines low Otherwise, they allow the lines to float So they are pulled up to high by the resistors This prevents a line from being driven high by one device and low by another device (which would create a short) What is missing? cs.ou.edu

    Packets

    Packets involve a multi-byte transfer between devices Start/stop Address Data cs.ou.edu

    Full Write Packet

    If at any point, the slave does not ACK a byte, this is considered an error and should be handled by the master cs.ou.edu

    Slave Transmission to the Master

    Must be in response to a master request Master still generates the clock signal Slave Transmission to the Master If the slave is capable of multi-byte transfer, the master can control whether a next byte will be sent: If the master acknowledges the byte, then the device will send the next byte If the master leaves acknowledge bit high, then the dev

    Provided Code

    Our master ISR implementation: Assumes a “write” followed by a “read” (as on the previous slide) Assumes that the master knows the size of the data packet to be sent from the slave ISR-based implementation: main program sets up the entire transaction & then lets the ISR take over (more soon) cs.ou.edu

    Problem with Multiple Masters

    A master is not allowed to initiate a transaction if one is already in progress We know this is the case if either SCK or SDL are low But – multiple masters may try to initiate at approximately the same time How do we detect this? cs.ou.edu

    Masters Colliding on the Bus

    When a master stops driving the line low, it can read the line state If the line does not return high, then we have a collision The master must abort its transaction and initiate at a later time The other master can continue its transaction without error cs.ou.edu

    I2C on the Mega8s

    Support in hardware Software interacts at the level of start/stop conditions and single byte data/address transfers Can be configured as a master or a slave Slave: address is configurable Master: clock rate is configurable (details optional) cs.ou.edu

    Software Interaction with the TWI Hardware: Initiation

    For each condition and data byte: Configure the hardware by setting the appropriate register states This includes committing to whether an ACK will be generated (by the receiver) Enable the hardware for the transaction Set the TWINT bit of TWCR cs.ou.edu

    Software Interaction with the TWI Hardware: After the Transaction

    TWINT bit of TWCR will go from low to high Note that some bits of TWCR have multiple functions. So: read and write operations do not access the same registers Can generate an interrupt on this event cs.ou.edu

    OUlib Support

    Provides (for the most part) a level of abstraction beyond the bit flipping • Some functions will initiate a transaction automatically (this is documented in the code) cs.ou.edu

    TWI Events: Master as Receiver

    Notes Macros for TWI events are defined by avr- LIBC The TWI events will only partially determine your FSM events E.g., a byte counter Similar event lists for other modes: Master as transmitter Slave as transmitter Slave as receiver cs.ou.edu

    Master Receiver

    What is the FSM? States? Events? Actions? Master Receiver States: tell us where we are in the protocol Events: TWI status other variables (we will need a counter) Actions: I2C atomic operations (start, stop, data, restart) Manipulate internal variables Master Receiver What does the FSM look like? (most) Possible Status Codes for Master Transmitter

    Main

    master_state master_address master_status ISR/Main Program Communication master_size ISR master_slave_size master_buffer Main master_state master_address master_status ISR/Main Program Communication master_size ISR master_slave_size master_buffer Main master_state master_address master_status ISR/Main Program Communication master_size ISR master_sl

    Subtleties

    We transition to the DONE state as we are issuing the stop condition But: we don’t wait for the stop condition to be completed There is a danger that we will initiate the next transaction before the previous one is really complete Subtleties For some reason, there does not seem to be an interrupt generated for master receive mode when the stop cond

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    Paramètres du protocole (à régler) :
    • Longueur des mots : 7 bits (ex : caractère ascii) ou 8 bits.
    • La vitesse de transmission : exprimée en bits par seconde (bps ou bauds) et réglable : 110 bps … ...
    • Parité : le mot transmis peut-être suivi ou non d'un bit de parité qui sert à détecter les éventuelles erreurs de transmission.

    Qu'est-ce que le protocole RS232 ?

    RS-232 (parfois appelée EIA RS-232, EIA 232 ou TIA 232) est une norme standardisant une voie de communication de type série.
    . Disponible sur presque tous les PC depuis 1981 jusqu'au milieu des années 2000, il est communément appelé le « port série ».

    Quelle est la configuration minimale d'une liaison cablage RS232 ?

    Pour gagner en immunité aux bruits et par le fait en qualité de transmission des données, la norme RS232 impose des tensions positives et négatives comprises entre 3V et 25V (en valeur absolue).
    . Un niveau logique '0' est représenté par une tension de +3V à +25V et un niveau logique '1' par une tension de -3V à -25V.

    Comment communiquer en RS232 ?

    Du côté récepteur le signal est reçu sur la broche RXD (Rx).
    . Pour communiquer sous forme de « chat », Il faut donc réaliser un c?le qui relie au moins le Tx de l'un avec le Rx de l'autre et vice versa.
    . La masse est nécessaire pour ce type de liaison.










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