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8086 Kit to Kit Communication using Optical Digital Link

Aim

To Study the 8086 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

 

8086 Transmitter Program

 

Address

Opcode

Mnemonics

1100

BE 00 15

MOV SI,1500

1103

B0 B6

MOV BL,B6

1105

BA 36 FF

MOV DX,FF36

1108

EE

OUT DX,AL

1109

B0 40

MOV AL,40

110B

BA 34 FF

MOV DX,FF34

110E

EE

OUT DX,AL

110F

B0 01

MOV AL,01

1111

BA 34 FF

MOV DX,FF34

1114

EE

OUT DX,AL

1115

B1 05

RELOAD: MOV CL,05

1117

BA 12 FF

CHECK: MOV DX,FF12

111A

EC

IN AL,DX

111B

24 04

AND AL,04

111D

74 F8

JZ CHECK

111F

8A 04

MOV AL,[SI]

1121

BA 10 FF

MOV DX,FF10

1124

EE

OUT DX,AL

1125

46

INC SI

1126

3C 3F

CMP AL,3F

1128

75 EB

JNZ RELOAD

112A

FE C9

DEC CL

112C

75 E9

JNZ CHECK

112E

CC

INT 03



8086 Receiver Program

 

Address

Opcode

Mnemonics

1100

BE 00 15

MOV SI,1500

1103

B0 B6

MOV BL,B6

1105

BA 36 FF

MOV DX,FF36

1108

EE

OUT DX,AL

1109

B0 40

MOV AL,40

110B

BA 34 FF

MOV DX,FF34

110E

EE

OUT DX,AL

110F

B0 01

MOV AL,01

1111

BA 34 FF

MOV DX,FF34

1114

EE

OUT DX,AL

1115

B1 05

RELOAD: MOV CL,05

1117

BA 12 FF

CHECK: MOV DX,FF12

111A

EC

IN AL,DX

111B

24 02

AND AL,02

111D

74 F8

JZ CHECK

111F

BA 10 FF

MOV DX,FF10

1122

EC

IN AL,DX

1123

88 04

MOV [SI],AL

1125

46

INC SI

1126

3C 3F

CMP AL,3F

1128

75 EB

JNZ RELOAD

112A

FE C9

DEC CL

112C

75 E9

JNZ CHECK

112E

CC

INT 03

112F

CC

INT 03



  • First execute the receiver side 8086 kit.
  • Give the transmitting data from 1500 address and execute the transmitter side 8086 kit.
  • Now received data verified from 1500 address in receiver side 8086 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