Figure 3-1, Message-Based Mode Of Operation; Figure 3-2, Register-Based Mode Of Operation - Racal Instruments 1260 VXI Manual

1260-152/172 User Manual
"CLOSE (@7(1))" Write value 2 to A24 Address 205001
1260-152/172
PC (MXI)
1260-01T
VXIbus

Figure 3-1, Message-Based Mode of Operation

In the register-based mode, the user writes directly to the control
registers on the 1260-152/172 module. The 1260-01T command
module does not monitor these operations, and does not keep
track of the relay states on the 1260-152/172 module in this mode.
A conceptual view of the register-based mode is shown in
Figure 3-2 below.
Write value 2 to A24 Address 205001
PC (MXI)
1260-152/172

Figure 3-2, Register-Based Mode of Operation

Since the 1260-01T switch controller does not keep track of relay
states during the register-based mode, it is advisable to use either
the message-based or the register-based mode, and continue to
use the same mode throughout the application program.
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
Module Operation 3-2 Racal Instruments Ó2003