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trying to connect a javelin stamp to an AF-P485 — Parallax Forums

trying to connect a javelin stamp to an AF-P485

pvpv Posts: 2
edited 2005-06-01 20:58 in General Discussion
I am trying to connect a javelin stamp to an AF-P485 (RS232 to RS485 converter). The AF-P485 has 4 pins: A, B, +/- 5V. Does anyone know how I connect these 4 pins to the javelin stamp?

Post Edited By Moderator (Dave Andreae (Parallax)) : 6/1/2005 8:12:42 PM GMT

Comments

  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2005-06-01 20:03
    I found a picture of it here

    http://www.artech.co.kr/products_array/options/af-p485_big.htm

    Neither of those 4 pins connect to the Javelin.

    The DSUB9 connector pins 2 and 3 must connect to 2 Javelin I/O pins

    via a RS232 level shifter like the MAX232 (or the Sipex237 on the Javelin demoboard)

    Then you define 2 Uarts, one for receive and one for transmit.

    regards peter
  • pvpv Posts: 2
    edited 2005-06-01 20:21
    Thanks for the reply Peter. I was not clear about my intent. I want to connect my javellin to the 485 side of the AF-485.
    The DSUB9 (i.e.the RS232 side) is plugged into my PC's serial port.

    The AF-485 will then convert the PC's 232 signal to a 485 signal that I will send out to a series of javelin stamps that are all hanging off of the 485 wires.
  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2005-06-01 20:58
    In that case you need another AF485 that connects to the Javelin as I described,

    then all A's and all B's must be connected (these make up the RS485 bus).

    Or use a Maxim MAX487 half duplex TTL to RS485 chip that connects

    directly to the Javelin (this chip also has the A and B).

    regards peter
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