[
Date Prev][
Date Next] [
Thread Prev][
Thread Next]
[
Date Index][
Thread Index][
Author Index]
Re: 55 HELIAL LOOPS
Rick Walker said:
> I'm just trying to figure out what adapter to use. Any suggestions?
Maybe this?
"Multiple message frame adaptor apparatus for loop communication system
Document Type and Number:
United States Patent 4042780
Abstract:
A serial data communication loop system includes single input-output
controllers and/or dual message transmission with a novel adaptor unit for
converting from a single to dual message frame and/or from a dual to
single
message frame. The message frames are multiple bit binary coded signals.
The
adaptor unit includes first and second converting sections, the first
converting from a single input to dual output message frames and the
second
from a pair of identical messages to a single message output. The first
section includes an amplifier connected to a polarity and level sensor and
to a time delay which activates a disable timer to the amplifier and a
strobe timer to operate a pair of transmitters to transmit the dual
message
frames. The second section includes a pair of receivers connected to a
logic
selector in combination with individual monitors which encode the status
at
the receivers to normally transmit from one receiver and automatically
change to the second if the first fails. The adaptor may connect the input
and output ports of a controller to a pair of parallel transmission
trunks,
automatically switch between main and back-up loop controllers connected
in
either a single or multiple trunk system, and provide an individual or
group
remote unit with message continuity if an individual or group loop is
broken."
I think I saw one on Ebay...
Happy Birthday Rick!
Jeff