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Optical data coupler

DAD15-8P-R-2388

4

The DAD 15-8P can be used to transfer data words eight bits wide bidirectionally.

A device pair is required to set up a transmission route. One device is operated as the MASTER (high level on the Master/Slave

input) and the second one as the SLAVE (low level on the Master/Slave input).

All binary control signals present in parallel on inputs D1 - D8 are converted serially into an 8-bit sequence in the device, are

transferred over the light route and are again applied in parallel in the receiver to outputs D1 - D8. Interference-resistant PPM

modulation is used to transfer binary signals. The entire cycle during which the two current 8-bit words are transferred one after

the other in both directions, in the time multiplex procedure, lasts 35 ms. This corresponds to a data rate of 350 Baud. This time

multiplex procedure is of no significance to the user, since the last data to be received is stored and is available on the outputs

until the next change is made.

Output behaviour when the beam of light is interrupted

The behaviour of the data outputs when the light beam is broken can be adjusted with the aid of the 4 switch (data latch):

OFF:

Data outputs are turned off when the light beam is broken.

ON:

The last data to be received remains intact on the outputs when the light beam is broken.

Input/output / emitter deactivation

A high level on the ENABLE input is required to operate the DAD15-8P. If there is a low level on the ENABLE input, the emitter

will be turned off.

The ENABLE input has no function in SLAVE mode.

Inputs and outputs, reception indicator:

The states of data inputs and outputs are displayed individu-

ally via LEDs. A high level on the input is indicated by a green

LED. A red LED indicates an active output.

Correct reception is indicated with the output and the RE-

CEPTION INDICATOR LED.

The SYNC output indicates the end of a transmit or receive

cycle. Output data are valid with a falling edge and new input

data can be read.

x

DAD15

100

10

3

1

Distance X [m]

Stability control

Relative received light strength

01

2

3

4

5

Function

Sensitivity adjuster

(behind the cover screw)

Receiver

Emitter

RxD

Power-on