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

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

Standard Keypads

SERIES 88

Sealed, Flange Mounted

3x4 Keyboard

3x4

Code and Truth Table

Dots in the chart indicate connected terminals

when switch is closed. Terminals are identified on

the keyboard.

3.000

± .015

(76,2

± 0,38)

2.800

± .010

(71,12

± 0,25)

.200 ± .010

(5,08 ± 0,25)

A B C

F G H

L M N

2.200 ± .015

(55,88 ± 0,38)

2.000 ± .010

(50,8 ± 0,25)

.100 (2,54)

TYP.

RETAINING

STUDS

.220 ± .010

(5,59 ± 25,4)

.100 ± .010

(2,54 ± 0,25)

BUTTON NO. 1

.093 ± .005

(2,36 ± 0,13)

DIA. 4 PLS.

C

L OF 2.200 (55,88) DIM.

•

•

•

1

2

3

4

5

6

7

8

9

10

11

12

CODES

3x4

Matrix

Single Pole/Common Bus

TERMINAL LOCATION

F E D K J H G

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J E A K F B L G C M H D N

•

•

•

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•

.500 .010

(12,7 ± 0,25)

(3 EQ. SPS)

TOL. NON-

ACCUM.

.380 (9,65)

SQ. TYP.

.750 ± .010

(19,05 ± 0,25)

1.990 + .000 - .010

(50,55 + .000 - 0,25)

.055 ± .010

(1,40 ± 0,25)

.105 ± .010

(2,67 ± 0,25)

ROW 1

ROW 2

ROW 3

ROW 4

2.690 + .000/

- .010

(68,33 + .000/

- 0,25)

SWITCH KEY

IDENTIFICATION

(FOR REF. ONLY)

.500 ± .010 (12,7 ± 0,25)

(2 EQ. SPS.) TOL. NON-

ACCUM.

.600 ± .010

(15,24 ± 0,25)

.128 ± .010

(3,25 ± 0,25)

.280 ± .010

(7,11 ± 0,25)

.025 ± .002

(0,64 ± 0,05)

SQUARE

TERMINAL

.360 ± .010

(9,14 ± 0,25)

.072

± .010

(1,83

± 0,25)

COL = COLUMN

BUTTON AREAS ARE EMBOSSED

1

2

3

4

5

6

7

8

9

10 11 12

.150 ± .005

(3,81 ± 0,13) R.

FEATURES

• Sealed Keyboard

• Colorful Graphic Overlay

• Audible, Snap-Dome Contact

• User Legendable Styles

• 3,000,000 Operations per Button

• Optional Panel Seal Gasket to

Protect Your Equipment

MATRIX TERMINAL PIN-OUT

DE F G HJ K

.100

TYP.

.600

SINGLE POLE COMMON BUS TERMINAL

ABC D E F G H J KL M N

.100

TYP.

1.200

Keypads

32