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8085 Kit to Kit Communication using Optical Digital Link

Aim

To Study the 8085 kit to kit communication using Optic Digital link.

 

 

Apparatus Required

 

Theory

 

Kit to Kit communication

Fiber optic digital link was used to transmit and receive the data from one place another place .In this digital link will be supporting 1Mbd speed data communication. It will be act as an optical data modem. So we can use this digital link system in various sectors. And this digital link was used RS 232 serial port for communication.

Transmitter

The heart of the transmitter is a light source. The major function of a light source is to convert an information signal from its electrical form into light. Today's fiber-optic communications systems use, as a light source, either light-emitting diodes (LEDs) or laser diodes (LDS). Both are miniature semiconductor devices that effectively convert electrical signals into light. They need power-supply connections and modulation circuitry. All these components are usually fabricated in one integrated package.





Fig: Transmitting LED HFBR 1251

 

This type LEDs needs external Driver circuits. Here we used IC 75451 for drive the LED.

Optical fiber

The transmission medium in fiber-optic communications systems is an optical fiber. The optical fiber is the transparent flexible filament that guides light from a transmitter to a receiver. An optical information signal entered at the transmitter end of a fiber - optic communications system is delivered to the receiver end by the optical fiber.

Model Diagram for Plastic Fiber cable





This is multi mode plastic fiber cable, in this fiber cable core diameter 1000 micron and fiber cladding index 1.402.

Receiver

The key component of an optical receiver is its photo detector. The major function of a photo detector is to convert an optical information signal back into an electrical signal (Photocurrent). The photo detector in today's fiber - optic communications systems is a semiconductor photodiode (PD). This miniature device is usually fabricated together with its electrical circuitry to from an integrated package that provides power-supply connections and signal amplification.





Fig:Receiving Photo Diode HFBR 2521

 

In this type Photo Diode have internal driver circuits. So no need any external driver.

Procedure

 

8085 Transmitter Program



Address

Opcode

Mnemonics

9100

21 00 92

LXI H,9200

9103

3E B6

MVI A,B6

9105

D3 23

OUT 23

9107

3E 40

MVI A,40

9109

D3 22

OUT 22

910B

3E 01

MVI A,01

910D

D3 22

OUT 22

910F

0E 05

RELOAD : MVI C,05

9111

DB 01

CHECK : IN 01

9113

E6 04

ANI 04

9115

CA 11 91

JZCHECK

9118

7E

MOV A,M

9119

D3 00

OUT 00

911B

23

INX H

911C

FE 3F

CPI 3F

911E

C2 0F 91

JNZ RELOAD

9121

0D

DCR C

9122

C2 11 91

JNZ CHECK

9125

CF

RST 1



8085 Receiver Program



Address

Opcode

Mnemonics

9100

21 00 92

LXI H,9200

9103

3E B6

MVI A,B6

9105

D3 23

OUT 23

9107

3E 40

MVI A,40

9109

D3 22

OUT 22

910B

3E 01

MVI A,01

910D

D3 22

OUT 22

910F

0E 05

RELOD : MVI C,05

9111

DB 01

CHECK : IN 01

9113

E6 02

ANI 04

9115

CA 11 91

JZ CHECK

9118

DB 00

IN 00

911A

77

MOV M,A

911B

23

INX H

911C

FE 3F

CPI 3F

911E

C2 0F 91

JNZ RELOAD

9121

0D

DCR C

9122

C2 11 91

JNZ CHEAK

9125

CF

RST 1

9126

CF

RST 1



  • First execute the receiver side 8085 kit.
  • Give the transmitting data from 9200 address and execute the transmitter side 8085 kit.
  • Now received data verified from 9200 address in receiver side 8085 kit.

 

Refer below links for more experiments:

Fiber Optic Digital Link

PC TO PC COMMUNICATION USING OPTICAL DIGITAL LINK

BIT RATE OF OPTICAL DIGITAL LINK SYSTEM