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4.9.23
Status (U)
Purpose
Format
Parameters
Use to access information concerning various operating conditions of the Model 595.
Un
n = 0 Send Machine Status Word
n = 1 Send Error Status Word
n = 2 Send Data Status Word
n = 3 Send Delay Time
n = 4 Send High and Low Limits of Voltage Source
n = 5 Send Voltage Source Setting
Description
When the command sequence UnX is transmitted, the instrument will transmit the
appropriate status word instead of its nckmal data string when it is addressed to
talk. The status word will be transmitted only once for each Un command.
UO: The format of UO status is shown in Figure 4-8. Note that the letters correspond
to modes programmed by the respective device-dependent commands. The default
values in the status word are also shown in Figure 4-8.
Note that all returned values correspond to the programmed numeric values.
IJlz The Ul command allows access to Model 595.error conditions. The error status
word (Figure 4-9) is actually a string of ASCII characters representing binary bit posi-
tions. Reading the Ul status clears the error bits. An error condition is also flagged
in the serial poll byte, and the instrument can be programmed to generate an SRQ
when an error condition occurs (see paragraph 4.920).
The various bits in the Ul Error Status words are described as follows:
IDDC-Set
when an illegal devicedependent
cormnan d (IDDC) such as EIX is
received (7" is illegal). @En, bus error)
IDDCO-Set
when an illegal device-dependent command option (IDDCO) such as
79X is received ("9" is illegal). @Err)
No Remote-Set when a progmmmin g co-and
is received when &EN is false. @Err)
Conflict-Set
when trying to send a Q or C command while the instrument is in
the current function. (n&r)
Trigger Overrun-Set
when the instrument receives a trigger while it is still process-
ing a reading from a previous trigger (or continuous). (tE?r)
Number-Set
when an out of range calibration value (A) or voltage source value (V,
H, L, I) is sent over the bus. (nErr, number error)
Self Test-Set
when the self-test (JO) has failed.
4-41
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