|
[DPRG] Serial Woes
Subject: [DPRG] Serial Woes
From: DeltaGraph at aol.com
DeltaGraph at aol.com
Date: Fri Feb 2 23:33:15 CST 2007
Eric,
I noticed on my Acroname serial biscuits (BrainStem modules) that I have a
jumper soldered from pin 7 to 8 (CTS RTS). Don't know if that has anything to
do with your problem. I think that was to satisfy Air Cable since I think on
PC I am not using handshaking. In fact, when I use hyper terminal, I tell it
no hand shaking.
Are you sure what data polarity is expected on Parallax end? The BrainStem
inverts data of course having a Max232 or somesuch inverting driver/receiver
chip on it.
You will need to invert it again possibly if Parallax module is expecting
RS-232 polarity on signals, but just tolerant of higher voltages and hoping your
RS-232 receiver is happy with 0 to 5 volt swings on its transmitted data.
Look at the device's TX level when it is not sending. Is it high or low?
If high, then you will need inverters between Parallax and Brainstem -- if I
got that right.
- Ron
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://list.dprg.org/pipermail/dprglist/attachments/20070203/09e475e5/attachment.html
More information about the DPRG mailing list
|
