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PICList Thread
'RS-232 based Porgrammer'
1997\01\31@033859 by Barbaros ASUROGLU

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Hello to everyone,

Has anyone used the programmer com84 to program a pic16c84 from RS232 without
the need to external supply?I am suspicious about powering it from rs232.Is
the voltage in rs232 enough to supply vpp?

Thanks alot for answering..

Regards.

Barbaros

1997\01\31@140628 by Franco

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Barbaros ASUROGLU wrote:
>
> Hello to everyone,
>
> Has anyone used the programmer com84 to program a pic16c84 from RS232 without
> the need to external supply?I am suspicious about powering it from rs232.Is
> the voltage in rs232 enough to supply vpp?
>
> Thanks alot for answering..
>
> Regards.
>
> Barbaros
Yes and no, it depends on what kind of serial card your PC has.
Older cards have trouble with that serial programmer.
Good luck.

1997\01\31@144608 by moan

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Barbaros ASUROGLU wrote:
>
> Hello to everyone,
>
> Has anyone used the programmer com84 to program a pic16c84 from RS232 without
> the need to external supply?I am suspicious about powering it from rs232.Is
> the voltage in rs232 enough to supply vpp?
>

Do you mean COM84 and PIP-02 ?
Have you tried replacing COM84 with JDM84 ??  It is better working on
faster machines >66 Mhz '84.

Mogens

1997\01\31@160339 by Lars Haven

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Barbaros ASUROGLU wrote:
>
> Hello to everyone,
>
> Has anyone used the programmer com84 to program a pic16c84 from RS232 without
> the need to external supply?I am suspicious about powering it from rs232.Is
> the voltage in rs232 enough to supply vpp?
>
> Thanks alot for answering..
>
> Regards.
>
> Barbaros

Hi,

I have been using a RS232 powered programmer for a couple of months
now. I have programmed a number of 16C84's without a hitch, even if
the 5 volt supply tends to be a bit marginal. Contrary to what you
might think, it can well be the current drawn for Vcc that proves
to be most critical. AFAIK, a properly implemented RS232 port should be
current limited to 20ma, which is barely sufficient, but it is supposed
to deliver at least +/- 12 volts when unloaded.

I may be using a slightly different circuit than the one you refer to.
I built the circuit described on
http://www.gbar.dtu.dk/~c888600/newpic.htm.
It runs attached to a vanilla PC COM port. This works very fine with the
PIP02 programme.

Happy PICing!
--
Lars Haven  <spam_OUTlhavenTakeThisOuTspammunin.ping.dk> aka <.....lhavenKILLspamspam@spam@pip.dknet.dk>
"tail recursion:
If you aren't sick of it already, see tail recursion."
                                 The new hacker's dictionary

1997\01\31@184109 by Leon Heller

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In message <32F2511C.10D1spamKILLspammbox.vol.it>, Franco <.....fraguiKILLspamspam.....MBOX.VOL.IT>
writes
>Barbaros ASUROGLU wrote:
>>
>> Hello to everyone,
>>
>> Has anyone used the programmer com84 to program a pic16c84 from RS232 without
>> the need to external supply?I am suspicious about powering it from rs232.Is
>> the voltage in rs232 enough to supply vpp?
>>
>> Thanks alot for answering..
>>
>> Regards.
>>
>> Barbaros
>Yes and no, it depends on what kind of serial card your PC has.
>Older cards have trouble with that serial programmer.
>Good luck.

My experience is the other way round! I can't get it to work on my old
486 with a newish PCI I/O card, or my new Pentium system with everything
on the motherboard. It works fine with an old ISA I/O card on the 486,
and on my three year old Dell at work. The best way round the problem is
to build the version with the 555 voltage doubler.

Leon
--
Leon Heller, G1HSM
EraseMEleonspam_OUTspamTakeThisOuTlfheller.demon.co.uk
Tel: +44 (0) 118 947 1424 (home)
    +44 (0) 1344 385556 (work)

1997\01\31@203703 by Lee Jones

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>> Is the voltage in rs232 enough to supply vpp?

> AFAIK, a properly implemented RS232 port [...] is supposed
> to deliver at least +/- 12 volts when unloaded.

No.  RS232 specifies that each transmitter output be between
+6V to +25V  or  -6V to -25V.  (The +6 and -6 limits may be
+5 & -5; I don't recall for sure from memory.  Check Motorola
MC1488/1489 or TI 75188/75189 data sheets.)  This tries to
guarantee that the receiver sees +3 to +25 or -3 to -25.

Supplies of +/- 12V used to be common in equipment, so the
serial driver chips used to use those voltages.

                                               Lee Jones

-------------------------------------------------------------------
Jones Computer Communications             leespamspam_OUTfrumble.claremont.edu
509 Black Hills Dr, Claremont, CA 91711         voice: 909-621-9008
-------------------------------------------------------------------


'RS-232 based Porgrammer'
1997\02\01@133351 by John Hamill
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I have used the serial  programmer which uses the rs232 v to provide Vpp for
16C84's without any problems.

BTW the actual Vpp on my system is only about 10.3v & the devices still
programe fine.




@spam@john.hamillKILLspamspambbc.co.uk

1997\02\01@141541 by Dennis Frost

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Something else I came across last night:

If you are having problems perhaps you should try the JDM84.exe driver. Its
claim to fame is that it does the same job as the Com84 driver except it
will work better with faster computers. Both com84 & JDM84 work on my
machine.
It is available at http://www.gbar.dtu.dk/~c888600/newpic.htm

Cheers
       Dennis

____________________________________________________
FROST - Electronic Design, Manufacture & Consulting.
Dennis Frost
Tel:   +27 331 965125
Cel:   +83 2275216
Email: KILLspamdennis.frostKILLspamspampixie.co.za
Pietermaritzburg, South Africa
Products:       Medical Motivational equipment
               Timers for food processing
               Random number generator
               Temperature controllers
____________________________________________________

PS Anyone looking for someone in the hardware/software development fields,
I am available. I intend leaving South Africa for the West coast of the US
early this year.

------------------
>Hello to everyone,
>
>Has anyone used the programmer com84 to program a pic16c84 from RS232
without
>the need to external supply?I am suspicious about powering it from
rs232.Is
>the voltage in rs232 enough to supply vpp?
>
>Thanks alot for answering..
>
>Regards.
>
>Barbaros

1997\02\04@024848 by Dorin Dogaroiu

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>Hello to everyone,
>
>Has anyone used the programmer com84 to program a pic16c84 from RS232 without
>the need to external supply?I am suspicious about powering it from rs232.Is
>the voltage in rs232 enough to supply vpp?

I used it. I was suspicious too about the power supply, but it works !

                               Dorin

P.S. In any case,  I preffer the Schaer programmer.

>
>Thanks alot for answering..
>
>Regards.
>
>Barbaros
>
>

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