User guide

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The status byte is decoded as follows:
Note: These values are not updated in the status byte when the listed condition occurs. They are made
available when the computer next requests transducer readings or attempts a motor command.
The flags are cleared by re-enabling the DV-III.
The I(dentify) command is optional and will cause the DV-III to respond with the ASCII string “DV3”.
This command is used as a means of identifying Brookfield instruments connected to a computer serial
ports. The DV-III is issued the E(nable) command to ascertain its current status. The DV-III will
respond with an echo of the E(nable) command and will append the current status <ss> existing in the
DV-III. This 2-digit status byte will provide information as to the rheometer’s internal working
condition and capability to continue with or to accept new tasks. The Rheometer torque value and current
temperature may be obtained by issuing the R(etrieve) command. As with the E(nable) command, no
parameters are passed to the DV-III. The DV-III’s response to this command is to echo the command:
R(etrieve) and then follow it with 8 hex digits comprising the current values for the Rheometer torque
<vvvv> and the temperature probe reading <tttt>. Any control program written to use the output of the
DV-III will have to perform all the calculations required for viscosity, shear stress and shear rate. The
DV-III will be directed to run at a given speed through the use of the V(elocity) command. Unlike the
two previous commands, this command requires the parameter <xxxx> which contain the value for the
desired speed. The DV-III responds to this command by repeating the command: V(elocity) and
Figure G1