Modular Incremental
Rotary Optical Encoder
MX21
Standard Features
• Resolutions to 1024 PPR
• Quick and easy installation
• Jitter-free outputs
• Increased MTBF
• Index and complementary output options
• 26LS31 line driver output from MX216
• High frequency response
• 2-year warranty
Series
By the time you have read this first sentence, you
could have installed BEI’s model MX21 INSTA-MOUNT
™
modular optical encoder. In addition to its quick and easy
installation, the MX21 is designed to operate with jitter-
free output signals without tight controls on shaft endplay,
runout, or perpendicularity. The new INSTA-MOUNT
™
encoder is capable of operating within a temperature range
of -10° to +70°C, requiring less than 30 milliamps of L.E.D.
current, without degradation of output signals and is short
circuit protected. The MX21 is perfectly suited for motor
manufacturers and other high volume OEMs.
BEI’s INSTA-MOUNT
™
Series encoder offers 5V TTL
compatible quadrature outputs with index and complements
as options. Axial shaft movements during operation, of
±0.010", will not adversely affect the output signals. Shaft
runouts of 0.005" TIR can also be absorbed by this device
without affecting output signal performance.
• Tolerant of axial and radial shaft movements often
associated with less expensive motor designs
Figure 1
MOUNT
SURFACE
.95
MAX
.12 MAX
AIR GAP
BUTTON
2X
Ø
.125
MIN
1.812
MOUNT HOLES
REMOVE CAP
FOR THRU SHAFT
Ø
2.125
MAX
All dimensions in inches
.xx = ±.02
.xxx = ±.005
18" MIN
BROWN TO
PIN 1
PIN 2
PIN 1
.XX =
±
.02
.XXX +
±
.005
15771 Red Hill Avenue
Tustin, CA 92780-7303
(714) 258-7500 Fax: (714) 258-4629
email: sales@beiduncan.com
www.beiduncan.com
ISO9001 Certified/QS9000 Compliant
MX21 INSTA-MOUNT
™
Series
Modular Incremental Rotary Optical Encoder
Performance Specifications
Mechanical
Dimensions
Weight
Moment of Inertia
Bore Size
Motor Interface
Mount Holes
Mount Hardware
Perpendicularity
Shaft to Mount
Shaft Runout
Shaft Endplay
Dynamic or Static
Shaft Finish
Shaft Tolerance
Shaft Length
see Figure 1
2.1 oz. (Approx.)
2.6 x 10
-5
oz in sec
see “Ordering Information”
#4-40 or M3 x 0.5 @ 180° on 1.812" dia B.C.
2 sockethead cap screws
0.002" TIR
0.005” max (each 0.0001 degrades
accuracy by 0.5 arc minutes)
±0.010"
16 microinches or better.
End must be chamfered or rounded
nominal -.0002"/-.0007"
0.56" minimum
(remove cap for motor through shaft)
FREQUENCY: KHz (Cycles/Second X 1000)
Pin #
1
2
3
4
5
Pinout MX212/213
Signal
Pin #
channel A
6
+5 volts
7
ground
8
NC
9
NC
10
Pinout MX216
Signal
Pin #
NC
6
+5 volts
7
ground
8
NC
9
channel A
10
Signal
NC
NC
channel B
NC
index (213)
Pin #
1
2
3
4
5
Signal
channel A
channel B
channel B
index
index
Electrical
Code
incremental
Pulses per Revolution
see “Ordering Information”
Index Pulse Options
ungated index (U)
(no index on MX212)
gated index (G)
Supply Voltage
5 volts ±5% @ 80mA max.
Output Format
dual channel quadrature and index
(MX212 & MX213)
(no index on MX212)
Output Format
dual channel quadrature and index
(MX216)
with complements
Output Type
square wave TTL. 16mA sink
(MX212 & MX213)
500µA source. Short circuit protected
Output Type
TTL differential line driver (26LS31 or equiv.)
(MX216)
should be terminated into a line receiver
(26LS32, or equivalent circuit)
Frequency Response
see graph: Fig. 3
Rise Time
1.0µsec. max.
Environmental
Temperature
Termination
Type
operating: -10°C to +70°C
storage: -40°C to +125°C
28 AWG flat ribbon cable with 10 position
connector Berg P/N 65863-165 or equiv.
Mates with Berg P/N65863-165 or equiv.
(mating connector not provided)
Figure 3
125
KHz =
100
75
50
25
RPM X PPR
60
PR
4P
102
200 PPR
1
2
3
4
5
6
7
8
SPEED (RPM X 1000)
Output Wave Form
360°E NOM.
180°E NOM.
90°E NOM.
A
A
B
Ordering Information
MX21 X - XX - XXXX - X
Basic Model No.
Output Format
2 = Quadrature
3 = Quadrature w/index
6 = Quadrature w/index & complements
Bore Size
25 = .25", 38 = .375", 50 = .500"
6M = 6mm, 8M = 8mm, 10M = 10mm
Pulses Per Revolution (PPR)
200, 400, 500, 512, 1000, 1024
Index Option
G = gated to data A & B
EXAMPLE: MX213-38-1000-U
U = ungated
B
INDEX GATED TO A & B
90°E TO 450°E
INDEX UNGATED
INDEX
INDEX
CCW ROTATION OF SHAFT
MX212 OUTPUTS A & B ONLY
MX213 OUTPUTS A, B & INDEX ONLY
MX216 OUTPUTS AS SHOWN
Specifications subject to change without notice. Printed in U.S.A.
BE0025-MX21-1001
15771 Red Hill Avenue
Tustin, CA 92780-7303
(714) 258-7500 Fax: (714) 258-4629
email: sales@beiduncan.com
www.beiduncan.com
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