Aim

To Study the 8086 kit to kit communication using Optic Digital link

Apparatus Required

• Fiber Optics Digital Transmitter Module– 01
• Fiber Optics Digital Receiver Module– 01
• Plastic Fiber cable 1 meter – 01
• PS 8086 kit – 02
• Adapter +15V/ DC – 02
• Patch Chords – 04
• PC to PC cable – 02

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.

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.

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

Procedure

• ☞Connect +15V adapter to both transmitter and receiver module.
• Switch (sw1) ON the transmitter Module, 8086 kits and receiver module (sw1).
• Connect PC to PC cable between 8086Kit 1 to transmitter Module P5 connector and receiver module P8 connecter to 8086 Kit 2.
• Connect the 1 m Plastic fiber cable between transmitter Module LED to receiver module Photo Diode.
• Connect P7 and P9 using patch chord at transmitter Module
• Connect P3 and P7 using patch chord at receiver module.
• Now type the transmitter program in transmitter side kit and receiver program in receiver side 8086 kit.

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..