Serial Port
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Posts: 46,084
Has anyone used Microsoft Quick Basic to transfer data between a PC and a stamp II using the com port?
Justin
Justin
Comments
What does the DTR pin of the serial port on a PC do? I'm hoping it "clocks"
the communications between a PC and some other device?
David Fixemer
fixemerd@a...
402-472-8239
Has anyone ever hooked up an ADC to the serial port of a computer? How do
you clock the ADC?
David Fixemer
Fixemerd@a...
402-472-8239
Ok, I got it to work ... yay! Howeever, now, I want to send a msg
from the computer to the transceiver... the serial data out pin (pin
3 on serial port) is always high though when no data is sent. When i
connect that pin to the transceiver input (pin 1 - TX), the TX is
always on then because of this voltage high from pin 3 of the serial
port... and then i can't receive anything from the receiver... does
anyone know if i can keep that pin (pin 3 on serial) low always, and
when it transmits it will transmit data... I tried just puting
outportb(0) or something like that..but, it would still add the start
bits, which screwed things up...
Thanks
Debu
I'm thinking this might be normal. Have you already hooked up the
transceiver, and verified it doesn't work? Or did you just hook up a
voltmeter, see the voltage and think "That's not right!"?
It's been a while since I worked with asynch at this level, but I'll give it
a try. When the line is idle, the line is kept at mark level.. The start of
a data byte is signaled by a start bit at space level. The start bit is
followed by the defined number of data bits from LSB to MSB, the parity bit
if defined, and the defined number of stop bits, again at mark level. Mark
level, according to the document I looked at at
http://www.techfest.com/networking/wan/async.htm says that "MARK condition
is normally established by a NEGATIVE voltage on the interface." I'm
guessing this voltage is probably what you're seeing.
Gregory Ross
Original Message
From: <debu_sen_22@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, November 22, 2001 5:29 AM
Subject: [noparse][[/noparse]basicstamps] Serial Port
> Hi again..
>
> Ok, I got it to work ... yay! Howeever, now, I want to send a msg
> from the computer to the transceiver... the serial data out pin (pin
> 3 on serial port) is always high though when no data is sent. When i
> connect that pin to the transceiver input (pin 1 - TX), the TX is
> always on then because of this voltage high from pin 3 of the serial
> port... and then i can't receive anything from the receiver... does
> anyone know if i can keep that pin (pin 3 on serial) low always, and
> when it transmits it will transmit data... I tried just puting
> outportb(0) or something like that..but, it would still add the start
> bits, which screwed things up...
>
> Thanks
>
> Debu
>
>
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>
Note some modules like the MING are simple on/off so should be a low input in
the
idle state.
> Hi Debu,
>
> I'm thinking this might be normal. Have you already hooked up the
> transceiver, and verified it doesn't work? Or did you just hook up a
> voltmeter, see the voltage and think "That's not right!"?
>
> It's been a while since I worked with asynch at this level, but I'll
> give it a try. When the line is idle, the line is kept at mark level..
> The start of a data byte is signaled by a start bit at space level.
> The start bit is followed by the defined number of data bits from LSB
> to MSB, the parity bit if defined, and the defined number of stop
> bits, again at mark level. Mark level, according to the document I
> looked at at http://www.techfest.com/networking/wan/async.htm says
> that "MARK condition is normally established by a NEGATIVE voltage on
> the interface." I'm guessing this voltage is probably what you're
> seeing.
>
> Gregory Ross
>
I was wondering before if there was anyway in C that I could make the
pin 3 of the serial port to be 0V instead of 5V (after the Max 232
conversion). The 5V is messing things up for me... my one solution
was to put it through a not gate, and then have another not gate at
the other receiving end...
Debu
I am going to assembl my on BS2(board of education).I need help
for interfacing BS2(using serial port) with PC.i am not understanding
the cicuit(board of education manual)confution came from one
photo(basicstamps/group).
anand
serial port. Is there a way to add a serial port? It has USB ports and I
think I've seen something about going from USB to serial.
thanks
bob
[noparse][[/noparse]Non-text portions of this message have been removed]
Keyspan 19W -- you can look on their website, and
comp-usa sometimes has them.
Stay away from BELKIN, as they don't support the
'ATN' line (DTR) properly.
--- In basicstamps@yahoogroups.com, eclecticrr@A... wrote:
> I just go a laptop PC that I'd like to use for my Stamp work. but
it has no
> serial port. Is there a way to add a serial port? It has USB
ports and I
> think I've seen something about going from USB to serial.
>
> thanks
>
> bob
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
finding one at first, but I was able to get one at Fry's Electronics.
But as you already may know with Fry's, its hit or miss!
Ed
--- In basicstamps@yahoogroups.com, eclecticrr@A... wrote:
> I just go a laptop PC that I'd like to use for my Stamp work. but
it has no
> serial port. Is there a way to add a serial port? It has USB
ports and I
> think I've seen something about going from USB to serial.
>
> thanks
>
> bob
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
probably broken or missing parts.
Original Message
> You can add a serial port via a PCMCIA card too. I had problems
> finding one at first, but I was able to get one at Fry's Electronics.
> But as you already may know with Fry's, its hit or miss!
> > I just go a laptop PC that I'd like to use for my Stamp work. but
> it has no
> > serial port. Is there a way to add a serial port? It has USB
> ports and I
> > think I've seen something about going from USB to serial.
Here are a link to the B&B site, they have all sorts of usb> 232,
eithernet> 232, pcmcia> 232 ect. Not cheap but they work well.
http://www.bb-elec.com/add_a_port/serial_usb_chart.asp
Not paid by B&B, I just use their stuff.
Brent
--- In basicstamps@yahoogroups.com, "amulet_ed" <edsandoval@h...>
wrote:
> You can add a serial port via a PCMCIA card too. I had problems
> finding one at first, but I was able to get one at Fry's
Electronics.
> But as you already may know with Fry's, its hit or miss!
>
> Ed
>
> --- In basicstamps@yahoogroups.com, eclecticrr@A... wrote:
> > I just go a laptop PC that I'd like to use for my Stamp work.
but
> it has no
> > serial port. Is there a way to add a serial port? It has USB
> ports and I
> > think I've seen something about going from USB to serial.
> >
> > thanks
> >
> > bob
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
only has vga,parallel printer & usb plus the pdmcia port. any help?
wndtnnl2000@y... writes:
> just got bs2 and found out need 9 pin serial to comm. over. my laptop
> only has vga,parallel printer & usb plus the pdmcia port. any help?
>
>
>
You will have to get a USB to serial adapter.
Sid Weaver
W4EKQ
Port Richey, FL
[noparse][[/noparse]Non-text portions of this message have been removed]
http://www.parallax.com/html_pages/products/componentshop/cables_power.asp
--- wndtnnl2000 <wndtnnl2000@y...> wrote:
> just got bs2 and found out need 9 pin serial to
> comm. over. my laptop
> only has vga,parallel printer & usb plus the pdmcia
> port. any help?
>
>
>
>
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Original Message
From: wndtnnl2000 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=efFN5PxTpmDSrDBE8HKSvpKR4Mgra5rUfd7Ak-uFftzN5TMeadbKv-H6paL1mJwM3f9EB289ag-Yx4U]wndtnnl2000@y...[/url
Sent: Saturday, March 27, 2004 6:01 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] serial port
just got bs2 and found out need 9 pin serial to comm. over. my laptop
only has vga,parallel printer & usb plus the pdmcia port. any help?