Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 331)

15B. Driver488/SUB, W31, W95, & WNT III. COMMAND REFERENCES - 15. Command References
III-316 Personal488 User’s Manual, Rev. 3.0
BusAddress
SYNTAX int pascal BusAddress (DevHandleT devHandle, char primary,
char secondary);
devHandle refers to either an IEEE 488 hardware interface or an external device.
primary is the IEEE 488 bus primary address of the specified device.
secondary is the IEEE 488 bus secondary address of the specified device. If the
specified device is an IEEE 488 hardware interface, this value must be -1
since there are no secondary addresses for the IEEE 488 hardware interface.
For no secondary address, a
-1 must be specified.
RETURNS -1 if error
MODE Any
BUS STATES None
SEE ALSO MakeDevice
EXAMPLE errorcode = BusAddress(dmm,14,0);
The BusAddress command sets the IEEE 488 bus address of the IEEE 488 hardware interface or an
external device. Every IEEE 488 bus device has an address that must be unique within any single
IEEE 488 bus system. The default IEEE 488 bus address for Driver488 is
21 , but this may be changed
if it conflicts with some other device.
CheckListener
SYNTAX int pascal CheckListener(DevHandleT devHandle, char primary,
char secondary);
devHandle refers to either an IEEE 488 hardware interface or an external device.
If devHandle refers to an external device, the CheckListener command
acts on the hardware interface to which the external device is attached.
primary is the primary bus address to check for a Listener ( 00 to 30 )
secondary is the secondary bus address to check for a Listener ( 00 to 31 ). For
no secondary address, a -1 must be specified
RETURNS -1 if error,
otherwise it returns a 1 if a listener was found at the
specified address and a 0 if a listener was not found at
the specified address.
MODE CA
BUS STATES ATN
•MTA, UNL, LAG, (check for NDAC asserted)
SEE ALSO FindListener, BusAddress
EXAMPLE result = CheckListener(ieee,15,4);
if (result == 1)
{
printf(“Device found at specified address.\n”);
}
if (result == 0)
{
printf(“Device not found at specified address.\n”);
}
The CheckListener command checks for the existence of a device on the IEEE 488 bus at the
specified address.