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MAX3110 & RS232 thoughts — Parallax Forums

MAX3110 & RS232 thoughts

ArchiverArchiver Posts: 46,084
edited 2003-07-15 06:14 in General Discussion
Hi,

I'm new to the list (had my 2p24 for 48 hours and up
and running fine - I programmed a lot 20+ years ago
and this device feels to have more umph than the £800
home micros I used then) and already found some good
info. I've already discovered the SERIN weakness
although by delaying each char sent by Hyperterm on my
PC the 2p will keep up. However does anyone know of a
source of the Maxim buffer/transciever device 3110 in
the UK?

How effective is the STAMP flow control system, if
driven back to PC with MAX232? Can XON/XOFF be
helpful? I was thinking of setting up a little routine
to do a 'software buffer' thus (please excuse the
pseudocode, PBASIC isn't natural yet!):

send XON to show ready
fetch byte
send XOFF to stop sender
fetch with time out a few times to 'catch' bytes
process the above in the 'slow routines'

Adrian


=====
-
*********************************************

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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-07-14 14:43
    At 08:40 AM 7/14/03 +0100, Adrian wrote:
    >Hi,
    >
    >I'm new to the list (had my 2p24 for 48 hours and up
    >and running fine - I programmed a lot 20+ years ago
    >and this device feels to have more umph than the £800
    >home micros I used then) and already found some good
    >info. I've already discovered the SERIN weakness
    >although by delaying each char sent by Hyperterm on my
    >PC the 2p will keep up. However does anyone know of a
    >source of the Maxim buffer/transciever device 3110 in
    >the UK?

    Hi Adrian -

    Here is one resource for Maxim/Dallas Semiconductors in the UK:
    http://www.micromark.net/

    Bruce Bates
  • ArchiverArchiver Posts: 46,084
    edited 2003-07-14 15:27
    These are generally hard to find. I know one of our UK customers asked
    us to source some of these for them since they were quoting some huge
    lead time in the UK. We wound up taking 30 days to get them ourselves.
    So in the end, including the shipping, it probably wound up about the
    same.

    I think Micromark is the Maxim distributor for the UK. Maxim also sells
    direct in the UK. See
    http://www.maxim-ic.com/sales_offices.cfm/filter/idistributors.

    If you haven't looked at it yet, be sure to read the serial UART article
    on my Web site. The URL is http://www.wd5gnr.com/suart.htm. This is a
    previous project of the month that originally appeared at
    http://www.al-williams.com/som.htm. I think Tracy also has a 31xx
    article on his site, but I'm sure he'll pipe up and tell us where.

    Al Williams
    AWC
    * Easy RS-232 Prototyping
    http://www.al-williams.com/awce/rs1.htm




    >
    Original Message
    > From: Adrian [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=XXCUL02vFKPq6LaDZwSOPoFrh9LuW1bNxkwi5vjWvR0RYt9qX5fgiOKDc6K_UVgDFWvu6PFvj8dYMw]adrian650@y...[/url
    > Sent: Monday, July 14, 2003 2:41 AM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] MAX3110 & RS232 thoughts
    >
    >
    > Hi,
    >
    > I'm new to the list (had my 2p24 for 48 hours and up
    > and running fine - I programmed a lot 20+ years ago
    > and this device feels to have more umph than the £800
    > home micros I used then) and already found some good
    > info. I've already discovered the SERIN weakness
    > although by delaying each char sent by Hyperterm on my
    > PC the 2p will keep up. However does anyone know of a
    > source of the Maxim buffer/transciever device 3110 in
    > the UK?
    >
    > How effective is the STAMP flow control system, if
    > driven back to PC with MAX232? Can XON/XOFF be
    > helpful? I was thinking of setting up a little routine
    > to do a 'software buffer' thus (please excuse the
    > pseudocode, PBASIC isn't natural yet!):
    >
    > send XON to show ready
    > fetch byte
    > send XOFF to stop sender
    > fetch with time out a few times to 'catch' bytes
    > process the above in the 'slow routines'
    >
    > Adrian
    >
    >
    > =====
    > -
    > *********************************************
    >
    > ______________________________________________________________
    > __________
    > Want to chat instantly with your online friends? Get the
    > FREE Yahoo! Messenger http://uk.messenger.yahoo.com/
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the
    > Subject and Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to
    > http://docs.yahoo.com/info/terms/
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2003-07-15 06:14
    Hi Adrian ,

    It may be easier to find the MAX3100, which is the basic version of
    the chip that lacks the built-in capacitors and RS232 driver.
    Otherwise, they are the same chip. I see that Digikey does have some
    MAX3110 in stock, but only in the 28 pin SOIC. They have stock of
    the '3100 in either the DIP-14 or in the QSOP-14.

    My article and code for it is located at
    <http://www.emesystems.com/BS2IrDA.htm>. The MAX3100 will do either
    hardwired or IrDA.

    -- Tracy




    >These are generally hard to find. I know one of our UK customers asked
    >us to source some of these for them since they were quoting some huge
    >lead time in the UK. We wound up taking 30 days to get them ourselves.
    >So in the end, including the shipping, it probably wound up about the
    >same.
    >
    >I think Micromark is the Maxim distributor for the UK. Maxim also sells
    >direct in the UK. See
    >http://www.maxim-ic.com/sales_offices.cfm/filter/idistributors.
    >
    >If you haven't looked at it yet, be sure to read the serial UART article
    >on my Web site. The URL is http://www.wd5gnr.com/suart.htm. This is a
    >previous project of the month that originally appeared at
    >http://www.al-williams.com/som.htm. I think Tracy also has a 31xx
    >article on his site, but I'm sure he'll pipe up and tell us where.
    >
    >Al Williams
    >AWC
    >* Easy RS-232 Prototyping
    >http://www.al-williams.com/awce/rs1.htm
    >
    >
    >
    >
    >>
    Original Message
    >> From: Adrian [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=LTNkUkksKnE-NIblms3uqZPs9OFCRfMW0u1bv3whVb2y497BOhveE0o_9jgKHw9hFiL8PX2JwSY8jG1P9Q]adrian650@y...[/url
    >> Sent: Monday, July 14, 2003 2:41 AM
    >> To: basicstamps@yahoogroups.com
    >> Subject: [noparse][[/noparse]basicstamps] MAX3110 & RS232 thoughts
    >>
    >>
    >> Hi,
    >>
    >> I'm new to the list (had my 2p24 for 48 hours and up
    >> and running fine - I programmed a lot 20+ years ago
    >> and this device feels to have more umph than the £800
    >> home micros I used then) and already found some good
    >> info. I've already discovered the SERIN weakness
    >> although by delaying each char sent by Hyperterm on my
    >> PC the 2p will keep up. However does anyone know of a
    >> source of the Maxim buffer/transciever device 3110 in
    >> the UK?
    >>
    >> How effective is the STAMP flow control system, if
    >> driven back to PC with MAX232? Can XON/XOFF be
    >> helpful? I was thinking of setting up a little routine
    >> to do a 'software buffer' thus (please excuse the
    >> pseudocode, PBASIC isn't natural yet!):
    >>
    >> send XON to show ready
    >> fetch byte
    >> send XOFF to stop sender
    >> fetch with time out a few times to 'catch' bytes
    >> process the above in the 'slow routines'
    >>
    >
    > > Adrian
    >>
    >>
    >> =====
    >> -
    >> *********************************************
    >>
    >> ______________________________________________________________
    >> __________
    >> Want to chat instantly with your online friends? Get the
    >> FREE Yahoo! Messenger http://uk.messenger.yahoo.com/
    >>
    >>
    >> To UNSUBSCRIBE, just send mail to:
    >> basicstamps-unsubscribe@yahoogroups.com
    >> from the same email address that you subscribed. Text in the
    >> Subject and Body of the message will be ignored.
    >>
    >>
    >> Your use of Yahoo! Groups is subject to
    > > http://docs.yahoo.com/info/terms/
    > >
    > >
    > >
    >
    >
    >To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    >from the same email address that you subscribed. Text in the
    >Subject and Body of the message will be ignored.
    >
    >
    >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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