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ADS-14221, PPT2 User Manual
COMMAND LIST NOTES
(1)
The C= and D= commands do not change the mode of operation but do provide a user supplied
power-up message if configured using the MO command.
(2)
The IN command does not change the operating parameters stored in RAM, but it does stop
continuous readings (P2, P4, T2 commands). If the IN=RESET command is sent, then any
parameters that were stored in RAM, and were not stored in the EEPROM with a SP command, will
default to the last stored EEPROM value. This may cause a change in the operational parameters as
well as a configuration change.
(3)
The P2, P4, and T2 commands do not change the operating parameters, only activate continuous
readings. The N= command does not change any operating parameter values only the DAC analog
output voltage.
(4)
When this information request command is sent to a group or global address, the PPT2s do not
immediately respond with their output. The command is repeated from PPT2 to PPT2 in a ring
configuration network , and eventually returned to the host processor. Each PPT2 appends its own
response as it forwards the command. Also, this command requires more time for execution, of
EEPROM reads , so responses from more than one PPT2 are not received in any guaranteed order.
During the execution of one of this command, if another command is received that is an "After" type,
whether globally, group, or individually addressed, the received command is rejected and the
command read status error (see RS command) is set.
(5)
These commands may cause sequential responses from any, all or none of the addressed units. A
sequential response is when the PPT2 reply is sent before the global or group command through the
network. See the individual command descriptions for detailed information.
(6)
These commands only require a write enable (WE) when used in the action directing form. For these
commands the WE command provides a single occurrence write enable for RAM update. That is,
only the next instruction is written to RAM. The WE=RAM command provides continuous write
enables for RAM for multiple command updates. The continuous RAM enable is active until a WE is
sent.
(7)
The N= command requires an NE command enable when used to send information. The NE
command provides single occurrence write enable for analog control. The NE=DAC command can
be used to provide continuous write enable for analog control.
(8)
These commands terminate an active continuous reading command (P2, P4, T2) and initiate the
new one.
(9)
These commands can be used to change RAM contents which can then be written to the EEPROM
using the SP=ALL command.
(10)
The DA command does not write to the DAC but it does allow the DAC to be controlled by the PPT2
input pressure value or by a digital value applied by the N= command.
(11)
These commands only write to the DAC when used in the action directing form.
(12)
A P2 mode will be cancelled when a DA= A, C, F, G or N parameter is selected. A P4 mode can be
cancelled when a DA=A, E, M or N parameter is selected.
October, 2016
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