Performs a Serial Poll of a specified GPIB device.
[ lSpl = ] GpibSpl ( lDevice )
The GpibSpl procedure syntax has the following parts:
|
Name |
Type |
Description |
|
lSpl |
Long |
Serial Poll byte |
|
lDevice |
Val Long |
Device address |
This function reads the Serial Poll byte of a device and the byte is assigned to the return value lSpl. Some devices are not capable of responding to a Serial Poll.
Serial Poll is usually the user-programmed response to a device Service ReQuest (SRQ).
The hexadecimal format of lDevice parameter is as follows:
lDevice = 0xBBPPSS
Where:
|
BB |
Board address (1 - 9) |
|
PP |
Device Primary address (0 - 31) - 0 if not used (bus address), 31 used for Primary address of 0 |
|
SS |
Device Secondary address (0 - 31) - 0 if not used (bus address or device without Secondary address), 31 used for Secondary address of 0 |
The value of lDevice may be obtained using the GetDriverAddress function.
A return value of -1 indicates that an error occurred during execution.
The following example waits until bit # 6 in the Serial Poll byte is 1 (SRQ). Then it receives a string.
lScope=GetDriverAddress("SCOPE")
i=0
While (GpibSpl(lScope) and 64) = 0 and i < 20000
i=i+1
Endwhile
If i < 20000 Then
GpibReceive(lDevice, "\r\n", 1, 150, 0, sData, 20)
Else
print "Scope Error: Timeout"
Endif