1260-132 User Manual
Module Operation 3-3
In general, the message-based mode of operation is easier to use
with utility software such as the National Instruments VXI Interactive
Control (VIC) program. The message-based mode allows the user
to send ASCII text commands to the 1260-01T and to read replies
from the 1260-01T. In addition, some features, such as the SCAN
list, are available only in the message-based mode of operation.
The register-based mode provides faster control of relay channels.
In this mode, relay operations are processed in less than 9
microseconds, not counting relay settling time or software
overhead inherent in I/O libraries such as VISA. To determine the
relay settling time, refer to Relay Settling Time in the Specifications
section.
Consult the 1260-01T User’s Manual for a comparison of the
message-based and register-based modes of operation.
Operating In VXI Message-Based Mode
Channel
Descriptors For
The 1260-132
The standard 1260-01T commands are used to operate the 1260-
132 module. These commands are described in the 1260-01T
User’s Manual.
Each 1260-01T relay command uses a
channel descriptor
to select
the channel(s) of interest. The syntax for a channel descriptor is the
same for all 1260 series modules. In general, the following syntax is
used to select a single channel:
(@ <module address> ( <channel> ) )
Where:
•
<module address> is the address of the 1260-132 module. This
is a number is in the range from 1 through 12, inclusive.
•
<channel range> is a list of channels to operate. Each channel
is a two-digit number. Thus, the valid channel numbers are:
0 through 23
When listing multiple channels, separate the
channels with a comma (,). To select a contiguous
range of channels, specify the first and last
channels, and separate them by a colon (:)
The following examples illustrate the use of the channel descriptors
for the 1260-132, with a module address of 8.
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