This document contains proprietary information of KVH Industries, Inc. and neither this document nor said proprietary information shall be
published, reproduced, copied, disclosed, or used for any purpose without the express written permission of a duly authorized KVH
representative.
1 Scope
This Interface Control Document (ICD) describes the serial communications and the electrical
and physical interfaces between the 1775 Inertial Measurement Unit (IMU) and the outside
world.
The “1775 IMU,” also referred to as “the unit,” “the IMU,” or “the system,” is the product at
large.
Other related documents include the Technical Manual (KVH part no. 54-0938) and the
Interface Control Drawing (KVH part no. 99-0353).
2 Abbreviations, Acronyms and Definitions
Table 2-1: List of Abbreviations and Acronyms Used
accelerometer and acceleration
American Standard Code for Information Interchange; a character-encoding
standard that specifies 128-characters into a 7-bit binary value.
Communications rate as symbols/sec (typical unit symbol is Bd); the IMU
outputs at 1 bit per symbol therefore baud equates to bits/sec.
Discrete data format, as opposed to an integer or floating-point value. For our
purposes, discrete values are bit fields (e.g., bit 0 of a status byte indicates
whether gyro X is outputting valid data).
Field Programmable Gate Array
Unit designation for g-force when associated with accelerometer data output
Gyro Control Board; a sub-system for gyro measurement
Hexadecimal notation. Often denoted by preceding the number with “0x”
IMU Control Board; a sub-system for overall unit control and user-interface
Interface Control Document or Interface Control Drawing
Inertial Measurement Unit
Micro-Electro-Mechanical Systems
A count sequence from 0 to N-1; ex. modulo 256 would range from 0 to 255,
then restart at 0.
An industry standard electrical signal level interface using balanced
differential pairs typically on twisted-pair wires at up to 10MBd (bits/sec) rates.
Single Precision Floating Point (IEEE-754 Big-endian format)
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