OEM7 SPAN Installation and Operation User Manual v14
311
APPENDIX F Frequently Asked Questions
1. How do I know if my IMU is connected properly?
a. Refer to the
VERSION
log. If your IMU is communicating with a SPAN enabled receiver, the IMU
details will be included in the log.
b. When powered, the HG-1700 IMU makes a noticeable humming sound. If no sound is heard, check
that the cable between the receiver and IMU is connected properly.
c. Most IMUs do not make noise. Check that the IMU interface cable is properly connected to the
receiver.
For the IMU-ISA-100C, IMU-FSAS, IMU-CPT, IMU-HG1900, IMU-ENC-LN200, IMU-µIMU-IC and
IMU-KVH1750, ensure the IMU interface cable is connected to an RS-422 capable port and the port is
configured to use RS-422.
d. If the cable is connected properly, check the flex cable mounted on top of the IMU. Refer to the instruc-
tions in this manual on proper IMU installation to ensure that the cable is seated properly on the IMU
pins. See
HG1700 IMU in Universal Enclosure
on page 282 or
LN-200 IMU in Universal Enclosure
page 291 for more details.
e. Check the input power supply. A minimum of 12V should be supplied to the system for stable IMU per-
formance. The supply should also be able to output at least 12W over the entire operating temperature
range.
2. What is the minimum configuration I need to do to get the system running?
a. Set the IMU type and IMU communication port with the
CONNECTIMU
command.
b. Specify the translational offset between the IMU center of navigation and the primary GNSS antenna
phase center with the
SETINSTRANSLATION
command.
c. Specify the rotational offset between the IMU Body frame and the Vehicle frame, with the
SETINSROTATION
command.
3. What types of IMUs are supported?
SPAN currently supports the following IMUs:
l
ADIS-16488 from Analog Devices
l
EG320N and EG370N from Epson
l
HG1700, HG1900, HG1930 and HG4930 from Honeywell
l
IMU-FSAS for iMar
l
IMU-KVH1750 and IMU-CPT from KVH
l
ISA-100C and µIMU from Northrop Grumman LITEF
l
LN-200 from Litton
l
STIM300 from Sensonor
Use the
CONNECTIMU
command to specify the type of IMU used.
4. Why don’t I have any INS data?
a. By default, the raw IMU data begins flowing at system start up. If there is no INS data, check that the
system has been configured properly.
b. If the
INSCOMMAND
command has been set to
START_FINE_TIME
, the RAWIMU logs are not
