Brookfield DV-III Rheometer User Manual

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APPENDIX G - Communications

The command set used to communicate with the DV-III is as follows:

COMMAND

RESPONSE

Name

from Computer

from DV-III

k(Reset)

<K>

No Response

E(nable)

<E>

R(etrieve)

<R>

V(elocity)

<V>

I(dentify)

<I>

Z(ero)

<Z>

Illegal String

<????>

<ss>

Where:

vvvv

= Transducer reading as 4 hex digits. The Rheometer calibration should yield a reading of

approximately 0400H when zeroing or at rest, and a reading of approximately 2B00H at
100% torque.

tttt

= Temperature reading as 4 hex digits. The temperature circuit is normally calibrated to

produce a reading of 2700H at 0 (zero) degrees Centigrade with a linear scale of 40 counts
per degree C.

xxxx

= Stepper motor speed as 4 hex digits. The motor speed command from the Host is in RPM

with an accuracy of 0.1 RPM. Thus, 0064H (100D) would equal 10.0 RPM. (Note: RPM
in decimal notation must be multiplied by 10 when converting to hex.)

= Status Byte as 2 hex digits.

ddd

= The ASCII characters “DV3”.

= These 2 characters will be used to represent the model for which the DV-III is configured.

The model decoding is shown in Table G1 below.

Table G1

DV-III Model Decoding

<Model>

<MM>

2.5LV

5LV

1/4RV

1/2RV

2HA

2.5HA

2HB

2.5HB

5HB