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IOOUTPUTS(ADDR, "SYST:ERR?", 9); /* Query error register */
IOENTERS(ADDR, into, &length); /* Enter error message */
if (atoi(into) != 0) /* Determine if error is present */
/* If errors present, print and exit */
{
while (atoi(into) != 0)
{
printf("Error %s in function %s\n\n", into, func_tion);
IOOUTPUTS(ADDR, "SYST:ERR?", 9);
IOENTERS(ADDR, into, &length);
}
exit(1);
}
}
Comments 1. Segmented Readings. Multiple bursts of pre-arm and post-arm readings
segment memory (see Figure 3-13). When transferring segmented readings
over the VME bus real time or post measurement, a partition window must
be accounted for. A partition window is the period during which the
digitizer configures each segment for data transfer. The partition window is
monitored by bit 1 of digitizer offset register 43
16
, and by bit 9 of the
condition register in the Operation Status Group (Figure 3-13). A
low-to-high transition of the bit indicates the next segment can be
transferred.
2. Monitoring the Partition Window. It is only necessary to monitor the
partition window bits when the digitizer readings are segmented and the
data register is accessed at speeds available through an embedded controller.
Monitoring bit 1 of offset register 43
16
is faster than using SCPI commands
to monitor bit 9 of the condition register.
3. Locating the Registers. Access to the data register and offset register
43
16
is through their addresses which are mapped by the HP E1406
Command Module or the system resource manager into A24 address space.
The data register offset (12
10
or 0C
16
) and Offset register 43
16
(67
10
) is
added to the A24 base address to form the complete register addresses. In
the program, the C function long get_base_addr(void) determines the A24
base address by reading the digitizer’s offset register in A16 address space.
Detailed information on locating the data and offset 43
16
registers can be
found in Chapter 3 under the section "VME Bus Data Transfers".
Chapter 2 Usin
g
the Di
g
itizer 71