Manual – Starflow Ultrasonic Doppler Instrument
Model 6526
Unidata Manual - 6526 Starflow User Manual Issue 17 01 2020.docx
Page 71
14.4.1
Starflow - Operation Sequence
Every scan, the Starflow performs the following sequence:
Measure velocity, depth, temperature and battery and store their values in the Hardware Register
area (from Address 200 on).
Execute the logger program (until EXIT detected).
If an RS-232 connection is sensed, send * c/r prompt to Computer Port and wait for a response.
Shut down Starflow and await next scan time.
14.4.2
Starflow - Program Instructions
A logger program starts at Address 384 and consists of one or more instructions. Each instruction
is four bytes long (even though some instructions do not use all four bytes). An instruction takes
about 0.5 millisecond to interpret and execute.
Typical instructions include:
TIMED GOTO Timer controlled logging sequences
CONDITIONAL GOTO Event controlled logging sequences
LOG DATA Flexible data storage command
(BLOCK) MOVE
Block, Word and Byte move
ACCUMULATE Block summation for averaging
OUTPUT
Control output sequences
BLOCK CLEAR
Storage initialization
ADDITION 2 & 4 byte operands, 4 byte result
SUBTRACTION
2 & 4 byte operands, 4 byte result
MULTIPLICATION 2 & 4 byte operands, 4 byte result
DIVISION 2 & 4 byte operands, 4 byte result or 2 byte result &
remainder
SERIAL INPUT/OUTPUT Bi-directional Data Bus read/write
15.0
STARFLOW SDI-12 INTERFACE
15.1
Introduction
SDI-12 is an industry-originated, serial digital interface bus designed to allow an operator to
connect a wide variety of transducers (meteorological, hydrological, water quality, etc.) to a single
SDI-12 Data Recorder, such as a Starlogger, with a single cable bus. This means that you could,
for instance, connect several Starflow instruments along with the other SDI-12 sensors to another
Starflow instrument or a Starlogger (or another brand SDI-12 Data Recorder) and not have to
worry about combinations of RS-232, parallel analog, BCD, serial analog, RS-422, etc. signal
types.
A unique feature of Starflow is its ability to operate as an SDI-12 sensor or configure the Starflow’s
Micrologger to be an SDI-12 Data Recorder.
This appendix assumes that the reader is familiar with the operation of the SDI-12 Sensor (Sensor)
and the SDI-12 Data Recorder (the Recorder).
