Shop OBEX P1 Docs P2 Docs Learn Events
About B.Stamps serial RS232 protocol (and Stamp PLC ) — Parallax Forums

About B.Stamps serial RS232 protocol (and Stamp PLC )

JoeJoe Posts: 184
edited 2005-10-07 20:22 in BASIC Stamp
Hi again,

The problem I have is that the Stamp PLC
is not really a PLC becuase the Stamp PLC
doesn't have a real protocol like:

Modbus, Profibus, DeviceNet, DNP, IEC, etc....

Almost all PLCs have different protocols.

There are a lot of PLC applications and if a Basic Stamp
could use, -for example only-, the Modbus protocol ( example)
could be very usefull.

Somebody knows how to add or modified the Stamp protocol ?

Thanks. Joe

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-10-07 18:56
    Isn't there already a thread going on this?

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • JoeJoe Posts: 184
    edited 2005-10-07 19:01
    Sorry Mr. Chris Savage,


    I don't understand
    your question ( my english is not good)

    Could you use other words?

    Thanks : Joe
  • stamptrolstamptrol Posts: 1,731
    edited 2005-10-07 19:03
    Joe,

    Having some other protocol doesn't make a processor a PLC or not. As long as it can do the logic control and is programmable, its a PLC in anyones book.

    As well, most manufacturers' PLC's at the lower end of the scale are usually lacking in communication of any kind, let alone a proprietary protocol. What I've found working with A-B, Toshiba, AutomationDirect plc's that the Stamp's communication and other characteristics make it a plc and a more useful one in many cases.

    As to Modbus, if you Google "Basic Stamps and Modbus", theres an article or two on using a Stamp to talk Modbus, complete with code listing.

    Cheers,

    Tom Sisk
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-10-07 19:29
    Joe,

    ·· What I was saying was you already posted this question in another post and so now there are two threads on the subject.· This can cause confusion, as well as limit responses because forum users may not know which thread/post to reply to.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • Jon WilliamsJon Williams Posts: 6,491
    edited 2005-10-07 19:52
    And the answer in this thread is the same I'll post here: The BASIC Stamp has no built in protocol support other than physcial RS-232 (TTL level) -- it is up to you to implement Modbus or any other protocol you choose.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Jon Williams
    Applications Engineer, Parallax
  • JoeJoe Posts: 184
    edited 2005-10-07 20:09
    I understand Chris, sorry.

    Thanks, Joe

    PS: Somebody knows where I can find information about how to add a protocol to the Stamp PLC like
    a common PLC ?
    Any kind of known protocol (must be known protocol) because the idea is to use the Stmps
    like a PLC.

    PS2: I tried Google without succes confused.gif
  • Jon WilliamsJon Williams Posts: 6,491
    edited 2005-10-07 20:22
    What you have to do is contact the protocol vendor for a specification -- then you can implement it (perhaps) on the BASIC Stamp.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Jon Williams
    Applications Engineer, Parallax
Sign In or Register to comment.