Directed Electronics 451M User Manual

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Directed Resistor Interface Pack
© 2003 Directed Electronics, Inc.
N451M 2-03
The Directed Resistor Interface Pack is an assortment of resistors
used to interface with most of today's multiplexed circuits.
When using the Directed Resistor Interface Pack, some circuits may
require a different resistance value than the resistors supplied. If
ing the resistors in a parallel or series connection, both of which
will provide different values.
For example, if the 620 OHM resistor and the 660 OHM resistor are
wired in parallel, the value is 320 OHMS. The same resistors wired
in a series configuration will produce a value of 1280 OHMS. This
allows greater flexibility with more values to use while interfacing
with the multiplexed systems of today's vehicles.
Series Connection
In a series connection, the end value is the sum of Resistor 1 (R1)
and Resistor 2 (R2). I.e., R1 + R2 = R3.
Parallel Connection
In a parallel connection, the end value is determined by Resistor 1
(R1) multiplied by Resistor 2 (R2). That total is then divided by the
sum of R1 and R2. I.e., (R1 x R2)
= R3
(R1 + R2)
R1
R2
R3
R3
R1
R2
Please refer to DirectFax Doc. 1041.
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