B&B Electronics 232OPSDA manual Application Program Interface

Chapter 5: Software

Application Program Interface

The application program interface (API) is a set of routines that makes it easy to communicate with the 232OPSDA module from a 16- bit DOS application. Example programs using the API are written in

Borland C++, Borland Pascal and Microsoft® QuickBASIC v4.5. The batch file, MAKEIT.BAT, in the directory for each language shows how to compile and link the demo program with the API routines.

B232OPSDA_ReadAnalog

Purpose: This function reads the A/D input channels.

Syntax:	C:	BOOL B232OPSDA_ReadAnalog (WORD hComDev,
		BYTE modAddr, WORD channels, WORD* data);
	Pascal:	function B232OPSDA_ReadAnalog (hComDev :
		word; modAddr : byte; channels : word;
	BASIC:	data : Pword);
		FUNCTION B232OPSDAReadAnalog (BYVAL
		hComDev AS INTEGER, BYVAL modAddr AS
		INTEGER, BYVAL channels AS INTEGER, BYVAL
		wdataseg AS INTEGER, BYVAL wdataoff AS
		INTEGER)
Remarks:	hComDev is the handle to a serial port where the
	module is connected. This is the value returned by
	initComPort. modAddr is the module address, which
	is always 30H (48 decimal) for the 232OPSDA module.
	channels is a bit mask for the A/D input channels that
	should be read. See the table below for the meaning of
	each bit.
	Bit	Channel	Value	Value
			(hex)	(decimal)
	Bit 7	(nothing)	80H	128
	Bit 6	(nothing)	40H	64
	Bit 5	A/D Channel 5	20H	32
	Bit 4	A/D Channel 4	10H	16
	Bit 3	A/D Channel 3	08H	8
	Bit 2	A/D Channel 2	04H	4
	Bit 1	A/D Channel 1	02H	2
	Bit 0	A/D Channel 0	01H	1

data is that address of an array of 16-bit values where the results of the A/D conversion will be stored.

For QuickBASIC users: wdataseg and wdataoff are the

Documentation Number 232OPSDA1397 Manual 19

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