IEEE-488 PROGRAMMING
4.7.12 u (Status)
Purpose
Format
Parameters
Default
Description
Access information concerning various operating conditions of the Model 263.
Un
UO send machine status Word
Ul send error status word
U2 send data status word
Upon power up, or after a DCL or SDC is received, the machine status word (UO)
will default to the values shown in Figure 4-8 and the bits in the error status word
(Ul) will clear (0).
When a U command is transmitted, the instrument will transmit the appropriate
status word instead of its normal data string when it is addressed to talk. The status
word will be transmitted only once for each U command.
UO: The format of UO status is shown in Figure 4-8. The letters correspond to modes
programmed by the respective device-dependent commands. Returned values
correspond to the programmed numeric values. The values shown in the UO
status word are the default values.
Ul: The Ul command allows access to Model 263 error conditions. The error status
word (Figure 4-9) is actually a string of ASCII characters representing binary
bit positions. 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 4.7.9).
The various bits in the Ul Error Status words are described as follows:
IDDC--Set when an illegal device-dependent command (IDDC) such as ElX is
received (“E” is illegal).
IDDCO--Set when an illegal device-dependent command option (IDDCO) such
as F9X is received (“9” is illegal).
No Remote--Set when a progr
amming command is received when REN is false.
Number--Set when a number error occurs. A number error occurs when an in-
valid value (V, A or L) command is received. Also, send a V command while
in OHMS will result in a number error.
Self-Test--Set when the self-test has failed.
4-23
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