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Model H25

Absolute Encoder

Long considered the industry standard for shafted incremental encoders, the Model H25

is now available in an absolute version with up to 13 Bits of resolution. It incorporates

many of the great standard features of the incremental version, including: EMI shield-

ing, 40-lb ABEC 7 bearings, matched thermal coefficients on critical components, and

custom optics. This encoder features a 12 or 13 Bit absolute parallel gray code output,

a selection line for count direction, and an output latch as standard. Output is standard

gray code with options for natural binary or SSI compatible signals. Signals can be pro-

vided in either a single-ended multi-voltage line driver (TTL compatible when provided

with 5 volts) or as an open-collector style of output. Typical applications include dam

gate control, cranes, telescopes, tool changers, and robotics.

The H25 Incremental Encoder is available with the following certification:

EN 55011 and EN 61000-6-2

Shaft Diameter:

3/8” (1/2”as special feature)

Flat On Shaft:

3/8” Shaft: 0.80 long X 0.03” deep;

1/2” Shaft: 0.80 long X 0.04” deep

Shaft Loading:

3/8” shaft: Up to 40 pounds axial and

35 pounds radial; 1/2” shaft: Up to 90 pounds axial and 80

pounds radial

Shaft Runout:

0.0005 T.I.R. at midpoint regardless of

shaft diameter

Starting Torque at 25°C:

Without shaft seal 1.0 in-oz

(max); With shaft seal 2.5 in-oz (max); 1/2” shaft with shaft

seal:3.5 in-oz (max)

Bearings:

Class ABEC 7 standard, ABEC 5 for 1/2” shaft

Shaft Material:

416 stainless steel

Bearing Housing:

Die cast aluminum with protective finish;

stainless steel (special feature)

Cover:

Die cast aluminum; stainless steel (special feature)

Bearing Life:

2 X 10

revs (1300 hrs at 2500 RPM)

at rated load 1 X 10

revs (67,000 hrs at 2500 RPM) at

10% of rated load

Mechanical Specifications

Maximum RPM:

12,000 RPM nominal, 8000 RPM with

1/2” shaft (see Frequency Response, below) 30,000 RPM

available on units with 3/8” shaft—consult with factory

Moment of Inertia:

4.1 X 10

-4

oz-in-sec

; 5.2 X 10

-4

oz-in-sec

with 1/2” shaft

Weight:

13 oz typical, 14.5 oz typical with 1/2” shaft

Code:

12 or 13 bits NB or GC; excess gray and BCD available

Counts Per Shaft Turn:

4096 or 8192

Count Transition Accuracy:

± 1/2 bit maximum

Supply Voltage:

5–28 VDC

Current Requirements:

120 mA typical

Output Formats:

Parallel: Gray Code, Natural Binary and

Binary Coded Decimal; Serial: Serial Synchronous Interface

(SSI) compatible; Analog: 4–20 mA, 0–10V

Voltage/Output:

(see note 3)

28V/V: Line Driver, 5–28 VDC in, Vout = Vin

28V/5: Line Driver, 5–28 VDC in, Vout = 5 VDC

28V/OC: Open Collector, 5–28 VDC in OCout

SSI: 5–28 VDC In/5Vout

Protection Level:

Reverse, overvoltage and output

short circuit protection

Frequency Response:

100kHz (1200 RPM for 12-bits, 600

RPM for 13-bits)

Output Termination Pinouts:

see Table 1, back page

Electrical Specifications

Environmental Specifications

Enclosure Rating:

NEMA 4 & 13 (IP 66) when ordered with

shaft seal (on units with an MS connector) or a cable gland

(on units with cable termination).

Temperature:

Operating, 0º to 70º C; extended tempera-

ture testing available (see note 5); Storage, -25º to 90º C

unless extended temperature option called out.

Shock:

50 g’s for 11 msec duration

Vibration:

5 to 2000 Hz @ 20 g’s

Humidity:

98% RH without condensation

Connector

MS3112E14-19P, 19–pin connector on encoder body,

mates to MS3116J14-19S (or equivalent)

NOTES & TABLES:

All notes and tables referred to in the

text can be found on the back of this page.

H25 Absolute Encoder Ordering Options

H25

for assistance call 800-350-2727

Use this diagram, working from left to right to construct your model number (example:

H25E-F4-SS-12GC-28V/V-CW-SM14/19).

All notes and tables referred to can be found on the back of these pages.

FACE

OUTPUT

TYPE:

SHAFT SEAL

VOLTAGE/OUTPUT:

SPECIAL FEATURES:

MOUNTS: CONFIGURATION:

TERMINATION

Heavy Duty

S = Special features

28V/V = 5–28 Vin/out

CODE TYPE:

LOCATION:

2.5 inch Dia.

SS = Shaft Seal

specified on purchase

28V/5 = 5–28 Vin/5Vout

GC = Gray Code

See note 2

HOUSING :

order (consult factory)

DIRECTION

E = End

See note 1

NB = Natural Binary 28V/OC = 5–28 Vin/OCout

See note 4

D = Square Flange

OF COUNT:

S = Side

NUMBER OF BITS:

BCD = Binary

A1 = 4–20mA; A2 = 0–10V

E = 2.5 inch dia.

CW = Clockwise

TERMINATION TYPE:

12 = 12-Bits, 4096 counts per turn Coded Decimal

SI = RS–422 Serial

increasing count

M14/19 = 19 pin connector

servo mount

X = Excess

13 = 13 Bits, 8192 counts per turn

Express

Asynchronous

CCW = Counter clock-

CS= Cable with gland seal

G = 2.62 inch dia.

gray code

(Excess gray codes and BCD

S3 = Serial

Encoder

wise increasing count

Cable length specified in inches

servo mount

available–consult factory

Synchronous Interface

(i.e. C18 = Pigtail 18” long)

See dimensions

See note 3

M18 = MS3102R18-1P

EXPRESS ENCODERS:

Items highlighted with

are standard Express Encoders and ship in one to three days.

(S3 output only)

Tel: 805-968-0782 /800-350-2727 | Fax: 805-968-3154 / 800-960-2726

7230 Hollister Ave., Goleta, CA 93117-2807 |

www.beisensors.com

Specification No. 02067-001 Rev.08-11

Model H25 Absolute Encoder

MS STYLE

CONNECTOR

1.30 (SM 14/19)

EM CONNECTOR

POSITION

SM CONNECTOR

POSITION

Serial Synchronous Interface (SSI)

Interfacing Long Data Lines:

Dimensions

POSITION

2.50

Ø 2.52

MAX

0.255

0.30

FICATION ADDENDUM, Serial Synchronous Interface SSI):

ut provides effective synchronization in a closed-loop control system. A clock

ain from a controller is used to shift out sensor data: one bit of position data is

ted to the controller per clock pulse received by the sensor. The use of a

LTR

ial driver permits reliable transmission of data over long distances in

ments that may be electrically noisy. The encoder utilizes a clock signal,

ECO_500

d by the user interface, to time the data transmission. Receiving electronics must

an appropriate receiver as well as line terminating resistors. An optional parity

ailable to validate the transmitted data.

SSI output provides effective synchronization in a closed-loop control system. A clock pulse train from a controller is used to clock out sensor data:

H25D - Square Flange

0.3747

Cable impedance creates a transmission delay, shifting the phase relationship between the clock pulse and the data. If this pulse shift exceeds 180 , then the wrong bit position will be sampled

0.3745

by the receiver.

by the sensor. The use of a

is a function of the cable

The

frequency, therefore,

one bit of position data is transmitted to the controller per one clock pulse received

AWG,maximum3allowable clock part number 37048-003

differential

group

permits reliable

driver

MS STYLE 1.30 (SM 14/19)

EM CONNECTOR

REVISIONS

length. For 24

stranded, pair cable (BEI

or equivalent) the

CONNECTOR

Ø 1.2500

0.300

POSITION

1.2495

delay is

noisy. The encoder utilizes a clock signal, provided by the user inter-

below shows the

0.100

transmission of data over long

DESCRIPTION

in environments that may be electrically

1.36nS/ft. The tablephase shift of less maximum transmission rate allowable as a function

distances

DATE

APPR

SM CONNECTOR

of cable length to ensure a

than 90 .

.100 MIN

POSITION

4/13/05

2.064 TYP

MS STYLE 1.30 (SM 14/19)

face, to time the data transmission. Receiving electronics must include an appropriate

(KHz) = 92,000/Cable Length (ft)

as line terminating resistors.

receiver as well

EM CONNECTOR

CLOCK: Maximum

1.032

CONNECTOR

0.88 ± 0.03

0.12

0.125

0.21 R

Ø 2.500

Features :

•

Synchronous transmission

•

Transmission lengths to 1000 feet

•

Accepts clock rates from 100 KHz to 1.8 MHz

onous transmission

485 compatible

mission lengths to 1000 feet

s clock rates from 100 KHz to 1.8 MHz

bit option is available

Ø 2.500

Ø 2.52

0.30

MAX

Cable impedance can create a transmission delay, in effect, shifting the

Ø 2.275

1.2500

phase relationship between the clock pulse and the data. If this phase shift

2.50

Ø 1.2495

1. Output driver of the encoder is a MAX 491 transceiver in transmit mode. The

0.88 ± 0.03

0.3747

Ø 0.218 4 HOLES

1.38

0.3745

exceeds 180°, then the wrong bit position will be sampled by the receiver.

(Ø 2.919 B.C. REF)

recommended receiver is a MAX 491 transceiver in receive mode.

0.255

Ø 2.52

Ø 1.2500

0.30

1.2495

As a result, the maximum allowable clock frequency is a function

MAX

the

SSI Compatible Serial Code (S3):

2. Controller provides a series of pulses (or differential pulse pairs) on

2.064

cable length. For 24 AWG, stranded, 3 pair cable (BEI part number 37048-

30°

Transmission

Ø 2.275

0.21 R

H25E -

1.032 TYP

Servo Mount

2.50

the CLOCK input lines.

nce:

MS STYLE 1.30 (SM 14/19)

003 or equivalent) the group delay is 1.36ns/ft. The table below shows

EM CONNECTOR

0.88 ± 0.03

0.3747

CONNECTOR

3. On the first HIGH-to-LOW CLOCK transition, the encoder latches its data

1.38

0.300

POSITION

0.3745

from the encoder is sent with a MAX 491 transceiver in transmit mode. It is

0.125

the maximum transmission rate allowable as a function of cable

SM CONNECTOR

length to

0.100

mended to use any RS-422/485 compatible receiver and provide a termination resistor

2.650

at the

your specific voltage and DATA line length.

current position and prepares to transmit.

1.2500.100 MIN

0.125

on the RS-422/485 specification for

POSITION

SQUARE

1.2495

ensure a phase shift of less than 90°.

0.34

MS STYLE 1.30 (SM 14/19)

LOCK signals are RS-422/485 compatible, differential TTL, with 180 Ohm termination

EM CONNECTOR

ors internal to the encoder.

4. Controller reads data on the falling edge of the next 15 clock cycles.

A series of pulses from the controller, on the CLOCK

CONNECTOR

Ø 2.500

0.300

POSITION

6-32 UNC-2B

advances the data.

2.064

0.100

TYP

0.125

30°

0.250 Min. Deep

2.500

Ø 2.498

e first HIGH-to-LOW CLOCK transition, the encoder latches

data at the current

and is always HIGH.

SM CONNECTOR

0.21 R

5. The first bit is

its

START bit

1.032

3 places equally spaced

0.125

on and prepares to transmit. The DATA signal during this transition is a START bit,

Ø 0.218 4 HOLES

1.2500

on a Ø 2.00 bolt circle.

CLOCK, Maximum (kHz) = 92,000 / Cable Length

used with a standard cable/connector assembly,

.100 MIN

(ft)CW

POSITION

2.50

Ø 1.2495

(Ø 2.919 B.C. REF)

is always HIGH.

*Connector is a

an MS3106F18-1S

BEI P/N: 924-31186-18XX.

6. Next comes 13 data bits beginning with the most significant bit (MSB)

MS3102E18-1P, 10-pin connector on the encoder body and mates tocable length in feet,connector or can be

ncoder shifts data to the DATA line on each LOW-to-HIGH clock transition, beginning

Ø 2.625

= 10 feet)

Ø 2.500

he MSB. The controller reads data on the HIGH-to-LOW transiton of the next 12 clock

Cable Length (ft)

(XX =

100

200

ie. 10

300 500 1000

0.255

2.500

and ending with the parity bit.

ending with the LSB. The parity bit (if parity option is specified) is clocked out on

On 12 bit encoders, bit 13 is LOW. When

2.52

Ø 2.498

0.30

supply voltage. To reverse the count direction,

th clock cycle. When the parity option is used, the 13th bit output is a logic LOW on

Direction Control: Standard is CW for increasing count when viewed from the shaft end. Direction Control (Pin C) is normally HIGH (or N/C) and is pulled up internally to the positive

2.650

MAX

1.2500

2.50

it Encoder or the LSB of a 13 bit Encoder.

not ordered, parity is LOW.

parity is

SQUARE

Ø 1.2495

Max Freq (kHz)

1800

Pin C must be pulled to LO (0V)

200 100

900 500 300

0.34

is even. The sum of all data bits and the parity bit is even.

Ø 2.275

SEAL

the last CLOCK LOW-to-HIGH transition, a minimum of 30 microseconds must pass

NOTE:

SHAFT

2.625

NOT

7. After

e the beginning of the next CLOCK series.

the last CLOCK HIGH-to-LOW transition, a minimum of 40 micro-

0.255

AVAILABLE ON H25 G

Ø 2.52

6-32 UNC-2B

0.3747

0.30

0.88 ± 0.03

SSI Compatible Output with Parity Option Timing Diagram:

0.3745

1.38

0.250 Min. Deep

MAX

seconds must pass before the beginning of the next CLOCK series.

3 places equally spaced

Ø 0.218 4 HOLES

1.2500

Min

on a Ø 2.00 bolt circle.

40us

20us Max

Ø 2.275

B.C. REF)

Dia Servo Mount

H25G - 2.62

(Ø 2.919

1.2495

SSI Timing

NOTE:

SHAFT SEAL NOT

es:

SM CONNECTOR

2.50

POSITION

0.255

0.300

0.100

.100 MIN

Data Transmission Sequence

1.2500

Ø 1.2495

2.650

SQUARE

0.1

0.12

Cable Length (feet)

100

200

500

300

500

200

1000

100

Max. Frequency (KHz)

1800

900

FUNCTION

DATA+

DATA-

CONNECTOR*

CABLE

YEL

TERM BOARD

H38

H40

30°

WHT/YEL

BLU

CLOCK+

CLOCK-

WHT/BLU

ORN

RED

BLK

DIRECTION CONTROL

ENABLE (OPTIONAL)

WHT/ORN

10-32

0.188

3 plac

on a

SUPPLY VOLTAGE (+V)

CASE GROUND

30°

CIRCUIT COMMON (0V)

GRN

10-3

0.18

3 pla

on a

Interfacing Long Data Lines

RWISE SPECIFIED

redrawn

Ordering SSI :

HOW TO SPECIFY SSI OUTPUT IN THE ENCODER

MODEL NUMBER: Use the designation, S3 between the

Code Format

designation and the

Connector

designation.

Example: H25D-SS-

12GC-S3-CW-SM18

INDUSTRIAL ENCODER DIVISION

KRB

MS STYLE

CONNECTOR

CLOCK+

1.30 (SM 14/19)

MSB

DATA+

START

BIT

MSB-1

2.064 TYP

0.300

1.032

0.100

SM CONNECTOR

1.2500 .100 MIN

POSITION

1.2495

Parity

LSB12

LSB13

(Optional)

0.3747

EM CONNECTOR

0.3745

POSITION

0.88 ± 0.03

0.21 R

START

BIT

START OF

NEXT CLOCK

30°

0.125

1.38

AVAILABLE ON H25 G

30°

RE IN INCHES

INISH

CHECKED

ENGR

APPR

S AND BREAK ALL

WITHIN .010

BEI

SPECIFICATION ADDENDUM

Output Code and Terminations

DATE

04/06/05

Example Model Number:

Ø 2.52

MAX

2.50

0.255

specify

SSI Output

0.30

2.064 TYP

30us Min

0.21 R

2.650

1.032

SQUARE

Specials:

-S = Parity Bit

2.650

Ø 2.500

30°

1.2500

Ø 1.2495

2.500

Ø 2.498

0.34

Ø 2.625

6-32 UNC-2B

0.250 Min. Deep

3 places equally spaced

on a Ø 2.00 bolt circle.

0.34

30°

B E I T E C H N O L O G I E S , I N C.

7230 Hollister Avenue | Goleta, CA 93117-2891 | Tel: (805) 968-0782 | Fax: (805) 968-3154

Encoder:

H25D - SS - 12GC - S3 - SM18 - S

TITLE

SSI Output Termination Table

REV

10-32 UNF-2B

0.188 Min. Deep

3 places equally spaced

on a

1.875 bolt circle.

010 MAX

NT CONTAINS PROPRIETARY INFORMATION OF

GIES, INC. ANY REPRODUCTION, USE OR DISCLOSURE

MENT WITHOUT WRITTEN CONSENT OF

GIES, INC. IS EXPRESSLY PROHIBITED.

TerminaTion

SIZE

Parallel

FSCM NO.

code

DWG NO.

TyPe

1RB90

Serial Synchronous Interface (SSI)

Gray

Natural

SCALE: NONE

924-02087-001

Code

Binary

Cable

12 Bit

924-02087-001

MSB

12 Bit

SHEET: 1/2

M14/19

Conn

M18 M14/19

Conn Conn

0.3747

BEI

DATA +

0.3745

B E I T E C H N O L O G I E S , I N C.

INDUSTRIAL ENCODER DIVISION

Cable

SIZE

FSCM NO.

Conn

0.88 ±

0.03

1RB90

SCALE: NONE

YEL

BLU

DWG NO.

SQUARE

Ø 0.218 4 HOLES

(Ø 2.919

Ø 2.275

B.C. REF)

REV

924-02087-001

1.38

SHEET: 2/2

DATA-

CLOCK+

CLOCK-

DIR CONTROL

CASE GROUND

CIRCUIT COMMON

+V SUPPLY VOLTAGE

SHIELD DRAIN

Ø 1.2500

1.2495

—

WHT/YEL

WHT/BLU

ORN

2.650

SQUARE

0.21 R

Ø 0.218 4 HOLES

(Ø 2.919 B.C. REF)

WHT/BLK

WHT/BRN

WHT/RED

WHT/ORN

WHT/YEL

WHT/GRN

WHT/BLU

WHT/VIO

WHT/GRY

WHT

GRY/BLK

GRY/BRN

GRY/RED

ORN

GRN

BLK

YEL

RED

BARE

—

1.032

2.064 TYP

Notes

30°

NOTE:

SHAFT SEAL NOT

AVAILABLE ON H25 G

6-32 UNC-2B

0.250 Min. Deep

3 places equally spaced

on a Ø 2.00 bolt circle.

10-32 UNF-2B

0.188 Min. Deep

3 places equally spaced

on a

1.875 bolt circle.

—

GRN

BLK

RED

Ø 0.218 4 HOLES

(Ø 2.919 B.C. REF)

BARE

LSB

0V (CIRCUIT COMMON)1 GRY/ORN

DIRECTION OF COUNT

CASE GROUND

0V (CIRCUIT COMMON)

LATCH CONTROL

+V (SUPPLY VOLTAGE)

SHIELD DRAIN

ETC. THRU LSB (GO)

Pin P is available for a tri-state option

Figures

Figure 1

ETC. THRU LSB (GO)

Direction of Count:

Standard is CW increasing when

viewed from the shaft end. Pin R is normally HI (or N/C)

and is pulled up internally to +V. To reverse the count

direction, Pin R must be pulled LO (COMMON ).

Latch control:

Encoder outputs are active and provide

continuous parallel position information when Pin

U is HI (or N/C). Pin U is pulled up internally to +V.

When Pin U is LO (COMMON) the encoder outputs

are latched at the logic state that is present when the

latch is applied and will stay latched until Pin U is no

longer grounded.

M18 Connector

is a MS3102R18-1P, 10-pin connector

on the encoder body and mates to an MS3106F18-1S

connector or can be used with a standard cable/con-

nector assembly, BEI P/N 924-31186-18XX (Where XX

= 10, 20 30 or 50 for a 10, 20, 30, or 50 foot length).

This is the preferred connector for SSI output.

ONE REVOLUTION

M14/19 Connector

is a MS3112E14-19P, 19-pin

connector on the encoder body and mates to an

MS3116J14-19S or equivalent.

CW Increasing Count Viewing Shaft

Gray Code

ONE REVOLUTION

Figure 2

ETC. THRU LSB (2

)

Natural Binary

ONE REVOLUTION

CW Increasing Count Viewing Shaft

Mounting is usually done either using the D-style square flange mount, E- or

G-style servo mounts, or one of the standard face mounts, F1 for example. Consult

factory for additional face mount options.

2.The

shaft seal is recommended in

UNF-2B

installations. The most common

virtually all

10-32

0.34

exceptions are applications requiring

0.188 Min.

low starting torque or those requiring

a very

Deep

3 places equally spaced

on a

1.875 bolt circle.

6-32 UNC-2B

high temperature and high speed.

operation at both

0.250 Min. Deep

IC’s:

Output IC’s

3. Output

places equally spaced

are available as either Line Driver (LD) or NPN Open

on a Ø 2.00 bolt circle.

Collector (OC) types. Open Collectors require pull-up resistors, resulting in higher

output source impedance (sink impedance is similar to that of line drivers). In

general, use of a Line Driver style output is recommended. Line Drivers source

or sink current and their lower impedance mean better noise immunity and faster

switching times.

Warning:

Do not connect any line driver outputs directly to circuit

common/OV, which may damage the driver. Unused outputs should be isolated and

left floating. Our applications specialists would be pleased to discuss your system

requirements and the compatibility of your receiving electronics with Line Driver type

outputs.

28V/V:

Multi-voltage Line Driver (7272*): 100 mA source/sink. Input voltage 5 to 28

VDC +/- 5% standard (Note: V

out

= V

). This driver is TTL compatible when used

with 5 volt supply. Supply lines are protected against overvoltage to 60 volts and

reverse voltage. Outputs are short circuit protected for one minute. Supply current is

120 mA typical (plus load current). This is the recommended replacement for 3904R

and 7406R open collector outputs with internal pullup resistors. It is also a direct

replacement for any 4469, 88C30, 8830 or 26LS31 line driver

28V/5:

Multi-voltage Line Driver (7272*): 100 mA source/sink. Input voltage 5 to 28

VDC +/- 5% standard, internally regulated with 5V (TTL compatible) logic out. Supply

lines are protected against overvoltage to 60 volts and reverse voltage. Outputs are

short circuit protected for one minute. Supply current is 90 mA typical (plus load cur-

rent).

Note:

Limit encoder load to 2.5W max at ambient. Example at 12 VDC: 2.5W/

(+12VDC minus +5VDC) = 357 mA total allowed current. Consult factory for your

specific requirements.

28V/OC:

NPN Open Collector (3904*, 7273*). Current sink of 80 mA max. Current

sourced by external pull- up resistor. Output can be pulled up to voltage other than

supply voltage (30 V max). Input voltage 5 to 28 VDC

/- 5% standard. Supply cur-

rent is 120 mA typical. This replaces prior IC’s with designations of 3904, 7406,

3302, 681 and 689.

Special –S at the end of the model number is used to define a variety of non-

standard features such as special shaft lengths, voltage options, or special testing.

Please consult the factory to discuss your special requirements.

Extended temperature ratings are available in the following ranges: -40 to 70°C, -40

to 85°C. Some models can operate down to -55°C. Extended temperature ranges can

affect other performance factors. Consult with factory for more specific information.

* Products manufactured prior to April 2007 used the line driver IC number instead of voltage output in model number.

30°

ETC. THRU LSB (2

)

CW Increasing Count Viewing Shaft

ONE REVOLUTION

Tel: 805-968-0782 /800-350-2727 | Fax: 805-968-3154 / 800-960-2726 | 7230 Hollister Ave., Goleta, CA 93117-2807 |

www.beisensors.com

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