請先看『使用說明』

From LEXWiKi

The Sample code source you can download from

<Google Drive>

Source file: RS485_Src

Binary file: RS485_Bin

<FTP>

Source file: RS485_Src

Binary file: RS485_Bin

How to use this Demo Application

1. Select RS485 com port to test and then click "Open" button (click close before you change another com)

2. Select receive com port and press Open

3. Put some letter in editbox and then press "Send", the editbox of receive will appear what you just enter.

4. Check "Auto-Flow" if you want to test auto flow function

Auto Check

Click "Auto Check" will check RS485 automaticlly and show the result after finish .

Test

Please following below when use this application to test COM functions.

picture of example

Parallel line
To be used in : 485->M303(485) 、 M303(485)->485 、 M303(485)->M303(485)

Parallel line + crossover + converter
To be used in : 485->232 、 M303(485)->232 、 232->485 、 232->M303

Corssover
Cross Tx node and Rx node

Converter
RS232 and RS485 signal converter

Sample code Introduction

Set Com port

   m_CommSend.put_CommPort(PortIndex); // int PortIndex: Port Number
   m_CommSend.put_Settings("9600,n,8,1");//baud rate ,parity ,data bit ,stop bit

When Receive buffer get more than one byte and will cause a ONCOMM message.

   m_CommSend.put_RThreshold(1);

Open Com port

   m_CommSend.put_PortOpen(TRUE);//Setting false and let port be closed
   m_CommSend.get_PortOpen();//Return ture if port is opened. 

Let RTS high by Setting TRUE when send data

   m_CommSend.put_RTSEnable(TRUE);

Send data or Receive data by buffer

   m_CommSend.put_Output(COleVariant(m_StrSendData));//Send data to Com Port buffer
   variant_inp = m_CommReceive.get_Input();//Receive data from Com Port buffer

Enable Auto-Flow

Enable/Disable auto-flow from bios setting ( Integrated Peripherals -> COM3 422/485 flow control )

Supported Auto-Flow M/B
VIA
CV700C, CV766C, 3V700C, 5V700C

INTEL
FI853P, CI945C, CI270C, 3I270A, 3I270C, FI270A