# Different Types of Rotary Switches

J

#### Jake

Jan 1, 1970
0
Could someone help me understand what the different types of rotary
switches do? Google searches have just turned up online stores. I'd like
to know what the differences between shorting, non-shorting, and

Thank you,
Jake

C

#### CFoley1064

Jan 1, 1970
0
Subject: Different Types of Rotary Switches
From: Jake [email protected]
Date: 4/8/2004 10:45 AM Central Standard Time
Message-id: <[email protected]>

Could someone help me understand what the different types of rotary
switches do? Google searches have just turned up online stores. I'd like
to know what the differences between shorting, non-shorting, and

Thank you,
Jake

Good morning, Jake. Shorting and non-shorting have to do with what happens
when a rotary switch is switched from one position to another. A "shorting"
switch, when switching from, say, position 1 to position 2, is guaranteed to at
least mometarily be making contact between the switch common, pos. 1 and pos. 2
at the same time. A "non-shorting" switch will at least momentarily have the
switch common be neither making contact with Pos. 1 or Pos. 2 when it is
switched. This can be of significance if, for instance, you're switching
between loads in an application where you can't have an open circuit. For that
you'd want a shorting-type. A non-shorting type would be important if, for
example, you had several logic-type outputs being switched to one common, where
you wouldn't want two conflicting outputs to short together. Most rotary
switches are non-shorting, but you should check first if it's important.

Various multi-pole switches are called "decimal" or "hexadecimal". These are 4
pole, 10- or 16-throw switches that are hard-wired internally so that, if you
wire them correctly, their outputs will "count" in binary from 0 (0000) up to
10 (1010) or F (1111). These switches can either be "non-inverted" (contact
closes for 1) or inverted (contact closes for 0). You would wire them up so
you would get the desired binary output.

Good luck
Chris

C

#### CFoley1064

Jan 1, 1970
0
Subject: Different Types of Rotary Switches
From: Jake [email protected]
Date: 4/8/2004 10:45 AM Central Standard Time
Message-id: <[email protected]>

Could someone help me understand what the different types of rotary
switches do? Google searches have just turned up online stores. I'd like
to know what the differences between shorting, non-shorting, and

Thank you,
Jake

Good morning, Jake. Shorting and non-shorting have to do with what happens
when a rotary switch is switched from one position to another. A "shorting"
switch, when switching from, say, position 1 to position 2, is guaranteed to at
least mometarily be making contact between the switch common, pos. 1 and pos. 2
at the same time. A "non-shorting" switch will at least momentarily have the
switch common be neither making contact with Pos. 1 or Pos. 2 when it is
switched. This can be of significance if, for instance, you're switching
between loads in an application where you can't have an open circuit. For that
you'd want a shorting-type. A non-shorting type would be important if, for
example, you had several logic-type outputs being switched to one common, where
you wouldn't want two conflicting outputs to short together. Most rotary
switches are non-shorting, but you should check first if it's important.

Various multi-pole switches are called "decimal" or "hexadecimal". These are 4
pole, 10- or 16-throw switches that are hard-wired internally so that, if you
wire them correctly, their outputs will "count" in binary from 0 (0000) up to
10 (1010) or F (1111). These switches can either be "non-inverted" (contact
closes for 1) or inverted (contact closes for 0). You would wire them up so
you would get the desired binary output.

As an example, the hexadecimal switch below is non-inverting, and is set for
position "E" (decimal 14, binary 1110).

VCC
+
|
..----------o-------------.
| Common |
| |
| "E" |
| |
| 8 4 2 1 |
'-o-----o-----o-----o----'
| | | |
o--. o--. o--. o--.
| | | | | | | |
.-. | .-. | .-. | .-. |
|R| | |R| | |R| | |R| |
| | | | | | | | | | | |
'-' | '-' | '-' | '-' |
| | | | | | | |
=== | === | === | === |
GND | GND | GND | GND |
| | | |
o o o o
1 1 1 0

created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de

Good luck
Chris

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