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1260-21 User Manual
Racal Instruments
©
2005
Module Operation 3-1
Chapter 3
MODULE OPERATION
Operating Modes
The 1260-21 may be operated either in
message-based
mode or in
register-based
mode.
In the
message-based
mode, the 1260-01T switch controller
interprets commands sent by the slot 0 controller, and determines
the appropriate data to send to the control registers of the 1260-21
module.
A conceptual view of the message-based mode of operation is
shown in
Figure 3-1
below.
Figure 3-1, Message-Based Mode of Operation
In
the
register-based
mode, the user writes directly to the control
registers on the 1260-21 module. The 1260-01T command module
does not monitor these operations, and does not keep track of the
relay states on the 1260-21 module in this mode.
A conceptual view of the register-based mode is shown in
Figure 3-2
below.
PC (MXI)
1260-01T
1260-21
VXIbus
"CLOSE (@7(1))"
Write value 2 to A24 Address 205001