Hemisphere GPS Crescent V100 Series Quick Reference Manual

Supplemental Sensors
A tilt sensor and gyro are integrated in the Crescent V100/
V110. The user can turn either on or off. However, the
system's performance is optimized with both on.
GYRO AID
Purpose Smooth rate of turn:
-Provides alternate
source of heading for
up to 3 minutes
when GPS lock is lost
-Shortens
heading
reacquisition
time
Calibration Will self-calibrate after
Procedure several minutes
To manually calibrate:
-After heading is
computed
-$JATT,GYROAID,YES
-Spin Vector for 1
minute at less than
o
15 per second
-Leave unit stationary
for 4 minutes
**It is not necessary
to recalibrate with
standard use because
the gyro selects the
calibration.
All manuals and user guides at all-guides.com
Common Commands and Messages

Differential Commands

$JDIFF
$JWAASPRN
TILT AID
$JGEO
$JASC,D1
-Smooths rate of
heading
$GPMSK
-Reduces startup

Serial Port Setting Commands

and
$JBAUD
reacquisition
times for

NMEA Messages

obtaining
$GPGGA
heading
$GPGLL
$GPGSA
Precalibrated
$GPGSV
during
$GPVTG
manufacture
$GPZDA
To recalibrate:
$GPHDG
-Ensure Vector is
level
$GPHDT
-$JATT,TILTCAL
$GPROT
$PCSI,1
$PSAT,HPR
$GPHDM
$J4STRING

Heading Parameter

$JATT,TILTAID
$JATT,TILTCAL
$JATT,GYROAID
$JATT,LEVEL
$JATT,HTAU
$JATT,PTAU
$JATT,HRTAU
$JATT,COGTAU
$JATT,SPDTAU
$JATT,HBIAS
$JATT,PBIAS
$JATT,NEGTILT
$JATT,ROLL
$JATT,NMEAHE
Differential mode
Configure for specific SBAS PRN numbers
Query for current location and satellites
Request SBAS diagnostic information
Tune beacon to specific frequency
RS-232C, RS-422 (output) communication rate
GPS fix data
Geographic position - lat/long
GNSS DOP and active satellites
GNSS satellites in view
COG and ground speed
Time and date
Provides magnetic deviation and variation for
calculating magnetic or true heading
RTK-derived GPS heading
RTK-derived GPS Rate of Turn
Beacon status
Heading, pitch/role and time in single message
Magnetic heading (based on RTK-derived GPS and
magnetic declination)
Output GPGGA, GPVTG, GPGSA and GPZDA (1 Hz max)
Enable/disable accelerometer,
pre-calibrated
Calibrate accelerometer
Enable/disable gyro
Enable/disable level operation
Set/query heading time constant (0.0 to 3600.0 sec)
Set/query pitch time constant (0.0 to 3600.0 sec)
Set/query heading rate time constant (0.0 to 3600.0 sec)
Set/query COG time constant (0.0 to 3600.0 sec)
Set/query speed time constant (0.0 to 3600.0 sec)
Set/query heading bias (-180.0° to +180.0°)
Set/query pitch/roll bias (-15.0° to +15.0°)
Enable/disable negative tilt
Configure for roll or pitch
Changes the HDT, ROT, HDG and HDM message
headers between GP and HE (or HC)
www.hemispheregps.com
Crescent V100 Series
Quick Reference Guide
(Part Number 875-0185-000 Rev. A1)
Crescent V100 - DGPS
Crescent V110 - DGPS + Beacon