User guide

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APPENDIX G - Communications

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

COMMAND COMMAND RESPONSE

Name from Computer from DV-III

k(Reset) <K><CR> No Response

E(nable) <E><CR> <E><ss><CR>

R(etrieve) <R><CR> <R><vvvv><tttt><ss><CR>

V(elocity) <V><xxxx><CR> <V><ss><CR>

I(dentify) <I><CR> <I><ddd><mm><CR>

Z(ero) <Z><CR> <Z><vvvv><ss><CR>

Illegal String <????><CR> <ss><CR>

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.)

ss = Status Byte as 2 hex digits.

ddd = The ASCII characters “DV3”.

mm = 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

LV LV

2.5LV 4L

5LV 5L

RV RV

1/4RV 1R

1/2RV 2R

HA HA

2HA 3A

2.5HA 4A

HB HB

2HB 3B

2.5HB 4B

5HB 5B