APPENDIX A IMU Technical Specifications
OEM7 SPAN Installation and Operation User Manual v14
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A hardware change by KVH regarding KVH1750 IMUs (manufactured after November 2015) expect a
differential MSYNC signal input (J1 (15 pin micro D female) of the IMU: Pin 11 MSync+, Pin 7 MSync-).
This was previously a single ended input signal on Pin 11 only. The NovAtel VARF signal used to
provide the MSYNC to the IMU remains single ended, however significant testing has been completed
with the existing IMU-KVH1750 Cable (01019211) in safe environments (no interference sources). No
issues or failures have been observed. There are no plans to modify NovAtel cables at this time.
However, for any custom or OEM cable solutions, it is recommended to follow KVH guidelines in provid-
ing a differential MSYNC signal, converting the VARF to differential and properly shielding for optimal
reliability.
Custom Cable Recommendations
The tables below provide recommendations for creating custom cables to replace the IMU-KVH1750 cable
(01019211).
Connector
Description
J1
Micro-D, 15-pin, female
J2
DB-9, female
Table 84: Connectors
IMU
RS-422
IMU-KVH1750
< 1.5 meters
Table 85: Maximum Cable
Length