KOMUNIKASI SERIAL

1

• KOMUNIKASI SERIAL
• PELATIHAN TELEMETRY
• 2005

2
KOMUNIKASI SERIAL

• Sinkron
• Data dikirim bersama dengan sinyal clock
• I2C (Inter-Integrated Circuit)
• SPI (Serial Peripheral Interface)
• Keyboard, mouse
• Asinkron
• Data dikirim tanpa sinyal clock
• UART (RS-232)
• Modem

3
Serial Sinkron
I2C SPI
Atmel datasheet, ATmega16
AKM datasheet, AK4551
4
ELECTRICAL SPECIFICATIONS OF RS-232 STANDARD

• A "Space" (logic 0) will be between 3 and 25
  Volts.
• A "Mark" (Logic 1) will be between -3 and -25
  Volts.
• The region between 3 and -3 volts is undefined.
• An open circuit voltage should never exceed 25
  volts. (In Reference to GND)
• A short circuit current should not exceed 500mA.
  The driver should be able to handle this without
  damage. (Take note of this one!)

5
SERIAL ASINKRON

• Diperlukan boudrate yang sama pada sisi pengirim
  dan penerima
• Pada pengiriman data harus disertakan start bit
  dan stop bit sebagai penanda awal dan akhir data
• Untuk menjaga integritas data, dapat disertakan
  bit parity.

6
TTL/CMOS Serial Logic Waveform
RS-232 Logic Waveform
www.beyondlogic.org
7
RS-232

• Kecepatan max. 115,200 BPS
• Panjang media/kabel max 60 meter
• Single-ended (terhadap ground)
• Sinyal mudah mendapat gangguan
• Voltage swing 25V
• Short circuit max 500mA

www.quatech.com
8
Null-modem

• Menghubungkan 2 DTE (sumber komunikasi, misal,
  PC)
• DTE Data Terminal Equipment
• DCE Data Communication Equipment (penyedia
  jalur komunikasi antar DTE, misal, modem)

www.beyondlogic.org
9
Serial dengan VisualBasic

• Disediakan komponen MSComm
• MSComm1.CommPort 1
• MSComm1.Settings "9600,N,8,1"
• MSComm1.InputLen 0
• MSComm1.PortOpen True
• MSComm1.Output "data"
• Baca MSComm1.Input
• MSComm1.PortOpen False

10
So.

• 1. Buat program sederhana untuk mengirim dan
  menerima data secara serial lewat Com1..