To recognize the module and learn the serial port input and output configuration of the serial port.
2. Basic Theory
In the series we will learn how to open a port from PC to Device, serial module, and vice versa. In the series, we only have one chance to open the port in time. The module can only be membka serial port and enter the data, after the data is complete then the port will be sent directly closed.
In this experiment, we will introduce a way to port membuaka / And also know how to work from the module through the device input and output board and the device's software using visual basic.
Serial PinOut pada konektor DB-25 & DB-9
D-Type-25 Pin No. | D-Type-9 Pin No. | Abbreviation | Full Name |
Pin 2 | Pin 3 | TD | Transmit Data |
Pin 3 | Pin 2 | RD | Receive Data |
Pin 4 | Pin 7 | RTS | Request To Send |
Pin 5 | Pin 8 | CTS | Clear To Send |
Pin 6 | Pin 6 | DSR | Data Set Ready |
Pin 7 | Pin 5 | SG | Signal Ground |
Pin 8 | Pin 1 | CD | Carrier Detect |
Pin 20 | Pin 4 | DTR | Data Transmit Ready |
Pin 22 | Pin 9 | RI | Ring Indikator |
Name | Address | IRQ |
COM 1 | 3F8 | 4 |
COM 2 | 2F8 | 3 |
COM 3 | 3F8 | 4 |
COM 4 | 2F8 | 3 |
Serves to indicate when a modem will be used and DSR modem set up to identify that the modem is ready and already tersmbung connection.
2. RTS (Request to Send)
Work to set up so that the computer can send a request for approval.
3. TxD (transmits data)
Function to process data transmission.
4. CTS (Clear To Send)
Work unuk inform that the computer modem is ready to receive and send via the phone cable.
5. DSR (Data Set Ready)
To identify the DTR. When DTR drop oileh made the computer will cause the modem to be most lost. Once the modem is lost akan that DSR Low.
6. DCD (Data Carier Detect)
7. RI (Ring Indicator)
3. Equipment List
1. Serial Port Module
2. 16 - Channel Input Board
3. 16 - Channel Output Board
4. 1 unit computer program and Visual Basic
4. Experiment Results
In the Form in visual basic when clicked will change color going on bunderan of the first black to be merah.Apabila DTR and RTS and TxD black also black as well.
5. Analysis and discussion
After creating the form in the appropriate module ago Enter the following command in visual basic form:
Private Sub Command1_Click ()
MSComm1.DTREnable = Not MSComm1.RTSEnable
Check_Status
End Sub
Private Sub Command2_Click ()
MSComm1.RTSEnable = Not MSComm1.RTSEnable
Check_Status
End Sub
Private Sub Command3_Click ()
MSComm1.Break = Not MSComm1.Break
Check_Status
End Sub
Private Sub Check_Status ()
Then if MSComm1.Break
Shape3.BackColor = & H80
Else
Shape3.BackColor = & HFF
End If
Then if MSComm1.RTSEnable
Shape2.BackColor = & H80
Else
Shape2.BackColor = & HFF
End If
Then if MSComm1.DTREnable
Shape1.BackColor = H80 &
Else
Shape1.BackColor = & HFF
End If
End Sub
6. Conclusion
1st On the serial data communication, data that is sent is longer.
2. Serial port is usually used as tools for mengkoneksikan mouse, modem.
3. serial communication can be used for a short distance away. For example using a cable modem with the phone. An important part of communication is a DB 9 serial and RS 232. DB 9 connector that is use to connect to the computer hardware. RS 232 is a purpose as a driver, which will convert the voltage from the hardware to comply with the voltage on the computer so that data can be legible.
