Changes between Version 9 and Version 10 of serial


Ignore:
Timestamp:
05/03/2018 09:52:35 AM (6 months ago)
Author:
Tim Harvey
Comment:

updated newport RS485 details

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  • serial

    v9 v10  
    244244The following table and sections below provides per-board details of RS485:
    245245||= Family  =||= Board                 =||= TXEN  =||= Transceiver =||= Termination =||= Fail-Safe Bias =||= Notes =||
    246 || Newport   || GW630x                  || gpio12  || [https://www.exar.com/ds/sp335e.pdf SP335E] || optional (gpio16) || included || see [#newport-rs485 newport RS485 below] ||
    247 || ||
     246|| Newport   || GW630x / GW640x                 || gpio12  || [https://www.exar.com/ds/sp335e.pdf SP335E] || optional (gpio16) || included || ||
    248247|| Ventana   || GW52xx '''(optional)''' || gpio193 || [http://dev.gateworks.com/datasheets/MAX14840E-MAX14841E.pdf MAX14840] || optional     || optional || TIOCSRS485 support ||
    249248||           || GW53xx '''(optional)''' || gpio193 || [http://dev.gateworks.com/datasheets/MAX14840E-MAX14841E.pdf MAX14840] || optional     || optional || TIOCSRS485 support ||
     
    359358[=#newport-rs485]
    360359=== Newport ===
    361 The GW630x support optional half-duplex, multi-drop RS585:
    362  * CN80XX / CN81XX UART2 (/dev/ttyAMA2)
    363  * [https://www.exar.com/ds/sp335e.pdf SP335E] transceiver
     360The GW630x / GW640x have 2 CN80XX UART's (UART2/UART3: /dev/ttyAMA2 and /dev/ttyAMA3) going to a [https://www.exar.com/ds/sp335e.pdf SP335E] transceiver which allows selecting a variety of RS232/RS485 configurations:
     361 * 2x RS232 w/o flow control
     362 * 1x RS232 w/ flow control
     363 * 1x RS485 half duplex
     364 * 1x RS485 full duplex
     365
     366RS485 modes feature:
     367 * optional half-duplex, multi-drop RS585:
     368 * CN80XX UART2 (/dev/ttyAMA2)
    364369 * optional on-board termination (enabled by gpio16)
    365370 * in-chip fail-safe protection to default idle inputs to logic-high (no external bias resistors required)
    366371 * TXEN connected to gpio12
     372
     373The pl011 Linux driver supporting the CN80XX serial ports (SERIAL_AMBA_PL011 drivers/tty/serial/amba-pl011.c) does not look like it supports RS485 directly. While this support could be added you can alternatively drive the TXEN gpio12 directly in a user application for RS485 half-duplex.
    367374
    368375