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B&B Electronics 232DRIO User Manual

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232DRIO-0308 Manual 
19 
B&B Electronics  --  PO Box 1040  --  Ottawa, IL  61350 
PH (815) 433-5100  --  FAX (815) 433-5104
 
Chapter 5 - Software 
 
 
This chapter will be divided into two sections.  The first section 
covers programming techniques for opening/closing a com port, 
receiving data, and manipulating data in QuickBasic and C/C++.  
The second section discusses how to install and run the 
demonstration program on an IBM PC or compatible. 
 
 
Symbol:   
X  Don’t cares (default setting should all be “0”) 
 
Programming Techniques 
 
232DRIO.LIB 
 
Opening a COM Port 
HComDev = initComPort(unsigned short addr, unsigned 
char irq, unsigned long baud, unsigned short PortIndex) 
The last parameter, PortIndex will always be 0 for programming the 
232DRIO module:   
 
InitComPort() 
Æ Returns 0 on error 
For example, the code to open COM port 1 and setting the baud rate 
to 9600 would be: 
 
HComDev = initComPort(0x03F8,4,9600,0) 
 
Closing a COM Port   
 
DeinitComPort(hComDev) 
Æ No return value 
 
 
 
 
Table 5.1 - Digital I/O Mask Values 
 Mask 
Values 
I/O Line # 
Hexadecimal 
Decimal 
   Relay #1 
1H (0x01) 
1 
   Relay #2 
2H (0x02) 
2 
   Input  #1 
4H (0x04) 
4 
           X 
8H (0x08) 
8 
           X 
10H (0x10) 
16 
 X 
20H (0x20) 
32 
           X 
40H (0x40) 
64 
           X 
80H (0x80) 
128