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Documentation Number 232OPSDA1397 Manual 19
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5105
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;
data : Pword);
BASIC:
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
(hex)
Value
(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: wdatase
g
and wdataoff are the