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RS-485
Related Posts

  • Forum Post: questions are regarding the SN65HVD1780 RS-485 interface chip

    Keith Taylor
    1) What additional external protection components does TI recommend? We were thinking of using SMA30CA (30V bi-directional 400W TVS). If you see a problem with this (or a better implementation), I would like to hear it. 2) On the datasheet (Absolute Maximum Ratings), what is the difference between...
    on Jan 13, 2010

  • Forum Post: SN65HVD10 Question

    Rob Mitrunen
    On a RJ-45 connector with integrated magnetic (schematic below), would one simply power the center-tap up to the VCC of the SN65HVD10? SLLA036D Interface Circuits for TIA/EIA-485 (RS-485) http://focus.ti.com/lit/an/slla036d/slla036d.pdf
    on Jun 15, 2010

  • Forum Post: SN65HVD33

    Anders Lange
    When using SN65HVD33 devices for a 4 Mbps half-duplex connection with ~4m meters of cable , 120 ohm termination at each end, we experience following behavior: The first bit in at transmission after a bus idle is corrupted by the driver – it seems that the driver has a delay...
    on Jul 9, 2010

  • Forum Post: SN65HVD10 - RS485 ESD protection recommendation?

    Terry Jendon
    A customer of ours is using a SN65HVD10 for RS485. He’s having issues with the output where it shorts to 3.3V and also Ground. They think it’s an ESD issue, but they want to know if TI has any recommendations on how to protect against ESD for this device? Any suggestions on how...
    on Sep 20, 2010

  • Forum Post: New article in Electronic Design about RS-485 power savings

    Clark Kinnaird
    Here is an article which discusses the power dissipation in a typical RS-485 network. This may be helpful for estimating power supplies and thermal considerations. Note that the newest RS-485 devices have significantly lower power dissipation than older designs. There is also a discussion about using...
    on Oct 5, 2010

  • Forum Post: ISO3080 - Isolated RS485 transceiver

    Josko Marasovic
    Hello, I found incompatibilities in data sheet between designators of receiver-driver on RS485 side through all data sheet. For receiver you have designators A/B and for driver you have Y/Z on first page in data sheet. Next, in schematics on test circuits and page 8, you have reversed designators...
    on Nov 15, 2010

  • Forum Post: Re: SN75179B

    Clark Kinnaird
    Hi Ankit, The SN75179B is a full-duplex driver/receiver for RS-422/RS485. At 100 meter length on CAT5, the signals will be okay for low-speed USB (1.5 Mbps) and maybe at full-speed USB (12 Mbps). For high-speed USB (480 Mbps) the twisted-pair lines will have too much distortion due to the low-pass...
    on Jan 3, 2011

  • Forum Post: RS-485 Compatibility Between 3.3V-supply and 5V-supply Devices

    Clark Kinnaird
    Recently, a designer asked, "Do you have an app note that explains why 3.3V and 5V 485 chips can operate on the same system?" Here is a short explanation of why you can mix and match RS-485 devices that use different supplies. The RS-485 standard (TIA-485-A) specifies the voltages...
    on Feb 11, 2011

  • Forum Post: Re: MLVD-SN65MLVD202D

    BIlly Lam
    Hi Thomas Yes, actually we built a network with star connection not a daisy chian type, we don't want to rework those cabling. So we need such a repeater to fulfill the 485 communication. We got a motherboard and some devices in 485 protocol and circuit. We need to connect them up, that's...
    on Apr 9, 2011

  • Forum Post: RS - 485 data pin control by msp430

    Pallav Gandhi
    Hi, I am using Msp430f5438 and Sn65hvd11 for rs485 connectivity. Now as we all know i will have to control data flow pins, so i have tied my one GPIO pin to both DE and RE of SN65hvd11d. As one of suggestions from forums i used UCBUSY to check if all data has been sent or not after this i toggle...
    on May 18, 2011

  • Forum Post: TI external UARTs that support 9bit addressing mode / rs485 multidrop

    James Salisbury
    Hi, I am looking for an external uart that supports 9bit addressing. Such a uart will use the partity bit to indicate the byte is address or data, and will cause a recive interupt if the parity bit is set. Thanks
    on Jun 13, 2011

  • Forum Post: SN65HVD10 Receive pin

    Santhosh Ramani
    Hello, I am using the SN65HVD10 for RS-485 interface connected to my UART on LM3S9D90. The nRE and DE signals on the IC are tied together and driven by a output pin on the mircocontroller. When the output pin is set to enable transmit ( which at the same time disables Receive) - the receive output...
    on Jun 27, 2011

  • Forum Post: Protection 5KV for Profibus ISO1176

    Luiz Fernando Da Silva
    I need a external protection 5KV for ISO1176 , I have been trying to use TVS SACB 8.5, but using this device I have had problems to increase the speeds above 1,5 MB/s because of the device's capacitance. Please, somebody can help me. Thanks,
    on Sep 16, 2011

  • Forum Post: Re: high speed differential interface IC (rs-485 multidrop/multipoints).

    Clark Kinnaird
    CherWei, We don't have a pin-to-pin for the LTM2881, but our ISO3086T has similar functions, using external components to achieve higher power conversion efficiency. See it at http://www.ti.com/product/iso3086t .
    on Nov 16, 2011

  • Forum Post: Re: RS-485 Compatibility Between 3.3V-supply and 5V-supply Devices

    Clark Kinnaird
    Mike, In general, devices that are specified for 3.3V-supply operation are not intended for use with 5V supplies. The concerns are (1) will the power supply damage the device (2) will the logic levels be compatible (3) standard compliance. (1) Check the ABS.MAX.Ratings to make sure the 3.3V device...
    on Feb 24, 2012

  • Forum Post: RE: NEED INFORMATION-SN65HVD30DG4

    Clark Kinnaird
    The typical power dissipation of the 'HVD30 depends on the loading and signaling rate. Assuming the driver has a 54 Ohm load, figure 16 in the datasheet shows the supply current for signaling rates up to 25 Mbps. Note that at very low signaling rates (0 Mbps) the supply current is about 38 mA. About...
    on Jul 24, 2012

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