ROTARY OPTICAL
The Bourns® EN model is a self-contained rotary optical encoder. It
produces a 2-bit quadrature signal which is suitable for digital systems
where both magnitude and direction of adjustment must be provided.
The EN encoder is ideal for use as a digital panel control or as a position
sensing device in applications where long life, reliability, high resolution
and precise linearity are critical.
Bourns encoder output signals are square wave digital pulses which
do not require debounce circuitry. Both features make it possible to
significantly reduce the memory overhead, wiring and wiring intercon-
nects required by other types of control devices.
EN optical encoders offer a useful rotational life of from 10 million to
200 million shaft revolutions, making them ideal for extended service
applications. The Bourns encoder is also compact and well suited for
situations where the available space is limited.
The EN series encoder converts rotary input into electrical signals
which can be used by microprocessors without A/D conversion.
EN - Rotary Optical Encoder
Dimensional Drawings
How To Order
Optional
BOURNS EN SERIES OPTICAL ENCODER
18.5
(.73)
15.88
(.625)
Radial Leads
2.54
(.100)
TYP.
6.35
(.250)
.635
(.025)
E
N
C
1
J - D
2
8 - L
0
0
1
2
8
SQ.
2.36
(.093)
21.21
(.835)
9.525
(.375)
8.636
(.34 )
ANTI-ROTATION
LUG POSITION
Code Description
SHAFT LENGTH*
Code Description
1/4-32 UNEF
9.53
(.375)
16
20
28
1/2" Long
5/8" Long
7/8" Long
3.167 + .000/ – .0076
(.1247 + .000/ – .0003)
1.37
(.054)
DIA.
D
J
P
None
9:00 Position
Rear Mount-
ing Bracket
Bushing Style C
TERMINAL***
CONFIGURATION
Code Description
SWITCHING
CONFIGURATION
Code Description
Channel A
L
R
Axial, Multi-
Purpose Pin
Radial, Multi-
Purpose Pin
Rear Ribbon
Cable with
Connector
Side Ribbon
Cable with
Connector
Rear Ribbon
Cable - No
Connector
Side Ribbon
Cable - No
Connector
7.14 + .000/ – .0508
(.281 + .000/ – .002)
10.32 + .000/ – .0508
(.4062 + .000/ – .002)
9.53
DIA.
6.342 + .000/ – .0076
(.2497 + .000/ – .0003)
DIA.
DIA.
9.53
(.375)
.254 ± .076
(.010 .003)
Leads
R.
3/8-32 UNEF
(.375)
1
Channel B
By 90
M
(Clockwise
Rotation)**
Code 1
N
W
Y
9.53
(.375)
1.57
1/4-32 UNEF
3/8-32 UNEF
1.57
Switching
With Index
Channel
(.062)
6.342 + .000/ – .0076
(.2497 + .000/ – .0003)
.787 ± .254
(.031 ± .010)
(.062)
3.167 + .000/ – .0076
(.1247 + .000/ – .003)
2
DIA.
DIA.
Anti-rotation Lug
View
Bushing Style S
(Ball Bearing)
Bushing Style A
Bushing Style T
(Ball Bearing)
RESOLUTION
Cycles Per
Code Revolution
1.57
(.062)
1.57
(.062)
TERMINATION DIAGRAM
1.57
(.062)
00025
00050
00064
00100
00125
00128
00200
00256
25
50
64
100
125
128
200
256
21.8
(.86)
3.167 + .000/ – .0076
(.1247 + .000/ – .003)
INDEX
DIA.
OR
N.C.
CHANNEL A
GROUND
Vcc CHANNEL B
Optional
Radial Leads
-
+
A
B
SHAFT STYLE
19.05 ± .0127
(.7500 ± .0005)
DIA.
Use With
Bushings (Code)
A, S
Code Description
22.2 + .0127 / – .1270
(.875 + .0005 / – .0050)
Servo Mount Style W (Ball Bearing)
DIA.
B
D
C
1/4" Dia., Plain End
1/8" Dia., Plain End
1/4" Dia., Single
Flatted
C, T, W
A, S
BUSHING CONFIGURATION
Code Description
Consult factory for options not shown, including:
•
•
•
•
•
•
Wire lead or cable options
Connectors
A
C
S
3/8"D X 3/8"L Threaded
1/4"D X 1/4"L Threaded
3/8"D X 3/8"L Threaded
(Ball Bearing)
Non-standard resolutions
Special shaft/bushing sizes and features
Special performance characteristics
PCB mounting bracket
T
1/4"D X 3/8"L Threaded
(Ball Bearing)
W
Servo Mount 7/8"D
(Ball Bearing)
* Shaft length measured from mounting surface.
** 25 and 50ppr is reversed (Channel B leads Channel A)
*** Standard ribbon cable is 10" long
Consult factory for other lengths.
145
Specifications are subject to change without notice.
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