ASM GmbH

CAT-PC-E-04

57

Tel.: +49-8123-986-0 Fax: +49-8123-986-500 www.asm-sensor.com

POSICHRON

®

Output Specification SSI

SSI

(synchronous serial)

Output

EIA RS-422, RS-485, short-circuit proof

Excitation Voltage

Excitation Current

150 mA max. without load

Clock Frequency

100 kHz ... 1 MHz

Code

Gray 24 bit, continuous progression

Resolution

2 µm max.

Delay between Pulse Trains

>25 µs

Stability (Temperature)

±20 x 10

Operation Temperature

-40 ... +85 °C

Immunity to Interference (EMC)

According to EN50082-2, EN50081-1

Data Format

(Train of 26 pulses)

The data transmission takes place by means of the two signals CLOCK and DATA. The

processing unit (PLC, Microcomputer) sends pulse sequences which clocks the data

transmission at the required transfer rate. With the first falling edge of the pulse sequence

the position of the sensor is recorded and stored. The following rising edges control the

bit-by-bit transmission of the data word. After a delay time the next new position information

will be transmitted.

Description

Signal diagram

Sensor circuit

Cable

Subsequent circuit

DATA

DATA

CLOCK

CLOCK

Note:

Extension of the cable length will reduce the

maximum transmission rate.

The signals CLOCK/CLOCK and DATA/DATA

must be connected in a twisted pair cable,

shielded per pair and common.

Cable length

Baud rate

50 m

100 … 1000 kHz

100 m

100 … 300 kHz

Signal Wiring /

Connection

Signal name

Connector pin no.

Cable colour

Excitation +

1

white

Excitation GND (0V)

2

brown

CLOCK

3

green

CLOCK

4

yellow

DATA

5

grey

DATA

6

pink

View to sensor

connector

WS-CONN-D8

CONN-M12-8P-X