Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois

60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com

Mechanical Encoders

SERIES 51

Binary or Binary

Complement Code

CIRCUIT DIAGRAMS

Switch is viewed from the shaft end and shown

in switch position number 1, which is decimal

number zero and BCD number zero.

BCD

BCD Complement

10

9

8

7

6

C2

5

4

3

2

1

12

11

C3

C1

4 OUTPUT

1 OUTPUT

2 OUTPUT

8 OUTPUT

TIED TOGETHER

ON PC BOARD

COMMON

ROTATING

CONTACTS

TIED TOGETHER

ON PC BOARD

TIED TOGETHER

ON PC BOARD

10

9

8

7

6

C2

5

4

3

2

1

12

11

C3

C1

4 OUTPUT

1 OUTPUT

2 OUTPUT

8 OUTPUT

TIED TOGETHER

ON PC BOARD

COMMON

ROTATING

CONTACTS

TIED TOGETHER

ON PC BOARD

TIED TOGETHER

ON PC BOARD

TIED TOGETHER

ON PC BOARD

Indicates Terminal is present.

Indicates Terminal is omitted.

Note: Connections must be made on PC board to

generate code output.

Switch position numbers do not correspond to the

decimal input or binary output. See Truth Tables.

FEATURES

• PC Mount, 30° Angle of Throw

• 2 to 12 Positions

• .562" Diameter, 200 mA

• Shaft and Panel Seal

• Adjustable Stop Versions

.093 ± .005

(2,36 ± 0,13)

105¡

SHAFT

FLAT

C

L

.203 ± .003

(5,16 ± 0,08)

Ø .562 + .025

–.015

(14,27 + 0,64

– 0,38)

Ø .125 ± .002

(3,18 ± 0,05)

.250 + .020 – .015

(6,35 + 0,51 –0,38)

.375 ± .015

(9,53 ± 0,38)

.250 ± .015

(6,35 ± 0,38)

.537 + .020 –.030

(13,64 + 0,51 –0,76)

1/4-28 UNF-2A

THREAD

.125 + .015

–.020

(3,18 + 0,38

–0,51)

.035 (0,89)

REF.

COMMON

POLE 1

COMMON

POLE 3

Ø .382 (9,70) TERMINAL

CIRCLE OF CENTERS

COMMON

POLE 2

Ø .232 (5,89)

COMMON CIRCLE

OF CENTERS

.020 ± .003

(0,51 ± 0,08)

.062 ± .004

(1,57 ± 0,10)

.125± .015

(3,18 ± 0,38)

Ø .025 ± .002

(0,64 ± 0,05)

.125± .015

(3,18 ± 0,38)

.020 ± .003

(0,51 ± 0,08)

See circuit

diagrams for

omitted terminals.

All switches are provided with PC mount terminals.

Grayhill part number and date code marked on label. Customer part number marked on request.

PC TERMINAL DETAIL

PC COMMON DETAIL

Encoder

7