Valeport Ltd © 2019
Introduction
Page 5
1.2. Specification
1.2.1. Power Supply
·
7 to 29V DC | 2W nominal
1.2.2. Data Acquisition
Sample rate
Raw signal sampling at 96 Hz
Filter
Digital FIR filter, automatically set to suit data rate. Fixed time delay for output for
each data rate [i.e. no frequency dependent phase shift]
Data Rate [Hz] -3dB point [Hz]
Cut off
[Hz]
Data delay [secs]
Data delay
[samples]
16
3.56
8
0.3125
5
8
3.01
4
1.875
15
4
1.17
2
1.75
7
2
0.61
1
4
8
1
0.30
0.5
8
8
1.2.3. Data Output
Data Rate:
1Hz Factory default, but user settable to 1, 2, 4, 8 or 16 Hz. Output on demand
mode also available
Communications:
RS232 or RS485 (factory set).
Factory default is 4800 baud, 8 data bits, 1 stop bit, no parity bits.
Baud rate can be changed by user to 2400, 4800, 9600 or 19200.
String format:
Knots
sXX.XX<TAB>sYY.YY<cr><lf>
m/s
sX.XXX<TAB>sY.YYY<cr><lf>
mm/s
sXXXXX<TAB>sYYYYY<cr><lf>
Where XXXXX, XX.XX or X.XXX and YYYYY, YY.YY or Y.YYY are the speeds for the X
and Y axis (including leading zero)
s is the sign(+ or -)
Fixed length 15 character string
Range:
Standard range of +/- 10knots (+/-5m/s) on each axis
Resolution:
A/D resolution of 0.01kts (0.001m/s)
Accuracy:
± 1% of reading on each axis.
Analogue Output
(option)
-5 to +5v for each channel. Reconstituted at +/- 12 bits from digital output and
updated at the data rate (1 Hz default).
Alternative formats are 0 – 10v (zero speed at 5v),
or 0 – 5v (zero speed at 2.5v) for each channel.
Calibration
Held in EEPROM in unit.
