Parallax Wireless transceiver
Archiver
Posts: 46,084
Hello everyone,
I have recently purchased a pair of 27988 Parallax transcivers however I am not
having very good success in communicating between the two.
I am testing them by connecting to my PC and typing over Hyperterminal.
I am also running my rs232 signals thorugh a max202 to shift to the CMOS
5V signals.
I just seem to be getting garbage coming on to my screen. On ocassion, the
computer seems to burp and get a stream of characters and then it pauses
again. Any ideas or suggestions from people with experience using RF
products? I am connected at 9600 8N1 to through my serial port.
As a simpler test, I can turn on and off the IN1 and OUT1 pins on the
transceiver.
Much thanks,
Thomas
[noparse][[/noparse]Non-text portions of this message have been removed]
I have recently purchased a pair of 27988 Parallax transcivers however I am not
having very good success in communicating between the two.
I am testing them by connecting to my PC and typing over Hyperterminal.
I am also running my rs232 signals thorugh a max202 to shift to the CMOS
5V signals.
I just seem to be getting garbage coming on to my screen. On ocassion, the
computer seems to burp and get a stream of characters and then it pauses
again. Any ideas or suggestions from people with experience using RF
products? I am connected at 9600 8N1 to through my serial port.
As a simpler test, I can turn on and off the IN1 and OUT1 pins on the
transceiver.
Much thanks,
Thomas
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
It sounds like you may be trying to mix ASCII code with raw data, which
won't often work well. Also, remember that your transceivers operate on the
same frequency, so even once you have both ends agreeing on a data format,
you must be sure that both are not trying to TX simultaneously. Either of
these scenarios would yield garbage at both ends...
Maybe there's a hyperterm expert lurking that can tell you more...
Chris
>
> I have recently purchased a pair of 27988 Parallax
> transcivers however I am not
> having very good success in communicating between the two.
>
> I am testing them by connecting to my PC and typing over
> Hyperterminal.
> I am also running my rs232 signals thorugh a max202 to shift
> to the CMOS
> 5V signals.
>
> I just seem to be getting garbage coming on to my screen. On
> ocassion, the
> computer seems to burp and get a stream of characters and
> then it pauses
> again. Any ideas or suggestions from people with experience using RF
> products? I am connected at 9600 8N1 to through my serial port.
>
> As a simpler test, I can turn on and off the IN1 and OUT1 pins on the
> transceiver.
>
> Much thanks,
>
> Thomas
>
>
have something to do with the flow control. Since I'm doing a PC
to PC connection, I am not using flow control. I haven't hooked up
my micro to it yet, but should the transceiver work if I just keep
typing a string of numbers in to my keyboard? I thought I should
at least get one out of x numbers of keys I pressed.
Anyways, I will hook up my 8051 controller to it and try it with
flow control.
Has anybody else tried this? Any special hyperterminal settings
or COM programs people use?
Much thanks,
Thomas
Original Message
From: "Chris Loiacono (E-mail)" <chris01@t...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, January 15, 2002 5:10 PM
Subject: RE: [noparse][[/noparse]basicstamps] Parallax Wireless transceiver
> Thomas:
> It sounds like you may be trying to mix ASCII code with raw data, which
> won't often work well. Also, remember that your transceivers operate on
the
> same frequency, so even once you have both ends agreeing on a data format,
> you must be sure that both are not trying to TX simultaneously. Either of
> these scenarios would yield garbage at both ends...
> Maybe there's a hyperterm expert lurking that can tell you more...
> Chris
> >
> > I have recently purchased a pair of 27988 Parallax
> > transcivers however I am not
> > having very good success in communicating between the two.
> >
> > I am testing them by connecting to my PC and typing over
> > Hyperterminal.
> > I am also running my rs232 signals thorugh a max202 to shift
> > to the CMOS
> > 5V signals.
> >
> > I just seem to be getting garbage coming on to my screen. On
> > ocassion, the
> > computer seems to burp and get a stream of characters and
> > then it pauses
> > again. Any ideas or suggestions from people with experience using RF
> > products? I am connected at 9600 8N1 to through my serial port.
> >
> > As a simpler test, I can turn on and off the IN1 and OUT1 pins on the
> > transceiver.
> >
> > Much thanks,
> >
> > Thomas
> >
> >
>
>
> 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/
>
>
I just got in on this discussion. Why do you want to talk PC to PC ? I do a
lot with Hyperterminal and it occurred to me that if you connect two PCs with
a serial cable, put them both on Hyper then you could talk all day. You
would need an adapter to connect the two male ends of the serial cable.
Sid
>For Thomas
>
>I just got in on this discussion. Why do you want to talk PC to PC ? I do a
>lot with Hyperterminal and it occurred to me that if you connect two PCs with
>a serial cable, put them both on Hyper then you could talk all day. You
>would need an adapter to connect the two male ends of the serial cable.
>
>Sid
Sid and Thomas-
To perform such a task successfully you will need a null modem between the
two PCs. Essentially it is nothing more than swapping the Tx and Rx lines
for SIMPLE communication. More needs to be done if anything sophisticated
such as flow control is involved.
Regards,
Bruce Bates
>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/
the
transceiver which is mounted on an air bearing. My PC will be providing
a real time data logging function. I just wanted to make sure of the
functionality
and perfornmance before hooking things up.
My air bearing is being used to simulate a spacecraft platform for attitude
control
and simulations so I can't have any cords on it.
But back to the problem, I thought you could just continously press a key to
repeatedly send to the transceiver and ignore flow control. I guess maybe
by doing that you're continually interupting the transmission. Any ideas out
there?
Much thanks
Original Message
From: <Newzed@a...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, January 16, 2002 7:20 AM
Subject: Re: [noparse][[/noparse]basicstamps] Parallax Wireless transceiver
> For Thomas
>
> I just got in on this discussion. Why do you want to talk PC to PC ? I
do a
> lot with Hyperterminal and it occurred to me that if you connect two PCs
with
> a serial cable, put them both on Hyper then you could talk all day. You
> would need an adapter to connect the two male ends of the serial cable.
>
> Sid
>
> 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/
>
>
Original Message
> From: Chris Loiacono [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=z_20HAEQwP7hXUP8Hc-Qy6Fmzpy3WmAADat1MG-CrDGGJpMRLlNJ4oXrMgNIZzj66JSc0rZQ-F8NVA]chris@m...[/url
> Sent: Wednesday, January 16, 2002 12:03 PM
> To: 'basicstamps@yahoogroups.com'
> Subject: RE: [noparse][[/noparse]basicstamps] Parallax Wireless transceiver
>
>
> Just set up "event-driven" comm between the two devices. With
> Stamps, it's fairly easy, because a Stamp program will just
> sit at a Serin instruction until it is satisfied. In this
> way, one device can be used to periodically poll the other
> for status across the RF link. If I wanted to do this test
> with a PC, I would take 15 minutes and set-up a simple VB
> app, and a Stamp or PIC at the remote link. Why mess with the
> terminal program?
>
> Chris
>
> > But back to the problem, I thought you could just continously
> > press a key to
> > repeatedly send to the transceiver and ignore flow control. I
> > guess maybe
> > by doing that you're continually interupting the
> > transmission. Any ideas out
> > there?
>
>
>I just got in on this discussion. Why do you want to talk PC to PC ? I do a
>lot with Hyperterminal and it occurred to me that if you connect two PCs with
>a serial cable, put them both on Hyper then you could talk all day. You
>would need an adapter to connect the two male ends of the serial cable.
>
>Sid
Not an adapter, but a null modem. This gizzy not only connects the cables
together,
it also crosses the appropriate RX & TX lines.
Carl