Subject:
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Serial interface/ RF data link
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 8 Dec 1998 17:08:01 GMT
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Original-From:
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DJKOZ97@AOLsaynotospam.COM
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Viewed:
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1211 times
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Let's say I want to use a serial interface board without the "charger", as the
one provided with the Handyboard kit. The Tx and Rx lines are obviously
required, but what about the ground and power lines?...
Speaking of "easy to interface" data link solutions, I have a kit from Lynx
Technologies which is supposed to provide a wireless two way voice/ data link.
All that you need to provide is the tx/rx data. The kit has 2 tx, 2 rx modules
and RS232 interfaces on 2 development boards (for 2 way communication) it also
includes 2 antennas. I had to order another pair in order to provide the 2 way
data link.
Unfortunately, I have not had any luck. This brings me back to the first
point- is it possible to use the serial interface board by just providing the
tx and rx lines?
I took a spare modular phone cable and tested it with the Handyboard's serial
interface board to make sure it worked... It did. Next, I cut it in half and
exposed the 4 wires. Judging from the schematic in the Handyboard manual, the
yellow wire is the rx line, the green is ground, the red power, and black is
the tx line. So I reconnected the tx and rx lines, and tried to run ic. When I
did, I got the message "Board disconnected or not responding". I then
reconnected the ground wire, but got the same message. It was only when I
reattached the red power wire that ic finally loaded successfully.
I guess my question is- with any of the wireless link solutions suggested, how
can we provide just the tx and rx data, without using the ground and power
lines? Or, at the very least, without the power line? ( Ground can be provided
from the receiver board).
Thanks again,
Dave
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