Output: This is not one of the defined VXI trigger protocols. This mode is
used when it is necessary to trigger other modules in the system when
another module has been triggered. To set up for this mode, the Trigger
Mode field is set to “ Output” . The Trigger Out field is set to the TTLTRG
trigger line that is to be triggered. And, the Trigger Source field is set to
one of the trigger sources other than the one set in the Trigger Out field.
Register-Based Command Reference
This section describes the low level register commands of the HP E1413
module. Commands are sent to the module through the Command Register
(08
16
) and Parameter Registers (0A
16
, 0C
16
, 0E
16
). Commands to the card
are either a command word only or a command word and one to three
parameter words. When a command includes parameters, the command
word is sent only after the parameter word(s) have been sent. For query
commands, data is returned through the Query Response Register (08
16
).
There is only one Query Response Register, there is no response buffering.
Therefore, any response left in the Query Response Register will be lost
(overwritten) by the next query command. Always read query responses
before executing the next query command. For example the value 9.9E+37
is 7E94F56A
16
, 7E94
16
is sent to the lower numbered parameter register,
while F56A
16
goes to the higher numbered parameter register.
Note on Number
Format
Where commands have the parameter names
<
highword
> and <
lowword
>
,
the values taken together represent a 32-bit floating point value in the
Motorola format. That is, the high 16-bit word goes to the lower numbered
parameter register, the low 16-bit word goes to the higher numbered
parameter register. For example, the value 9.9E+37
10
is 7E94F56A
16
,
7E94
16
is sent to the lower numbered parameter register, while F56A
16
goes to the higher numbered parameter register.
Note that the ASCII command names shown here are a descriptive
convenience only. The actual command is a sixteen-bit word, shown to the
right of the command name. Where the command name ends with a
lower-case “ n” , bits 1 - 0 of the command word control which of four
possible scan lists are referenced by the command. The Register-Based
Commands are divided into the categories listed on the following page.
356 Register-Based Programming
Appendix D
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