Local Command Set
Chapter 3
GPIB-VXI User Manual
3-48
© National Instruments Corporation
Word Serial Communication Commands and Queries
The Word Serial communication commands and queries are described on the following pages.
•
ProtErr?
•
RespReg?
•
WScmd
•
WScmd?
•
WSresp?
•
WSstr
•
WSstr?
These commands can be used to directly generate Word Serial communication operations with
any Message-Based device, including the GPIB-VXI itself, regardless of whether or not it is the
GPIB-VXI's servant.
Note:
The Word Serial communication commands and queries are intended for debugging
purposes. National Instruments does not guarantee that these commands will work
when other Word Serial paths are open, such as the GPIB Secondary Address link.
Some of the Word Serial commands as defined in the VXIbus specification require a response
from the Message-Based device, while other commands do not. To distinguish between the two
types of Word Serial commands, and to avoid confusion between Word Serial commands and
GPIB-VXI local commands and queries, the following terminology will be used in this section:
Word Serial command–A VXI-defined Word Serial command that does not require a response
from the Message-Based device.
Word Serial query–A VXI-defined Word Serial command that requires a response from the
Message-Based device.
Command–A GPIB-VXI command, as defined in this chapter.
Query–A GPIB-VXI query, as defined in this chapter.
The
WScmd
command is used to send a Word Serial command to a Message-Based device. The
WScmd?
query is used to send a Word Serial query to the Message-Based device, and to
automatically read and return the device's response.
WScmd
can also be used to send a Word Serial query to a Message-Based device. Because
WScmd
does not read the query response, the intermediate state of the device can be examined
using the
RespReg?
query, after which the response can be read using the
WSresp?
query.
