Oxford Technical Solutions Ltd  Page 4 of 110 
 
Operation ................................................................................................................................................................................................... 26 
Front panel layout ............................................................................................................................................................................. 26 
LED definitions ................................................................................................................................................................................... 26 
I/O connectors .................................................................................................................................................................................... 27 
User cables .......................................................................................................................................................................................... 30 
Digital inputs and outputs ............................................................................................................................................................. 34 
1PPS output .................................................................................................................................................................................... 34 
Trigger 1 and 2............................................................................................................................................................................... 34 
Wheel speed input ....................................................................................................................................................................... 35 
IMU sync output pulse ................................................................................................................................................................ 36 
Co-ordinate frame conventions .................................................................................................................................................. 36 
IMU frame ........................................................................................................................................................................................ 36 
OxTS NED navigation frame ..................................................................................................................................................... 37 
ISO 8855 ENU earth-fixed system ......................................................................................................................................... 38 
OxTS horizontal frame ................................................................................................................................................................ 39 
ISO 8855 intermediate system ............................................................................................................................................... 40 
OxTS vehicle frame ...................................................................................................................................................................... 41 
ISO 8855 vehicle system ........................................................................................................................................................... 41 
Ethernet configuration .................................................................................................................................................................... 42 
Connection details for Ethernet configuration ................................................................................................................. 44 
Dual antenna systems ..................................................................................................................................................................... 44 
Multipath effects on dual antenna systems ...................................................................................................................... 45 
Configuring the RT ................................................................................................................................................................................. 47 
Overview ................................................................................................................................................................................................ 47 
Working through NAVconfig .......................................................................................................................................................... 47 
NAVconfig Home section in NAVconfig ..................................................................................................................................... 48 
Start/Read Configuration section in NAVconfig .................................................................................................................... 49 
Read Configuration section ........................................................................................................................................................... 49 
Hardware Setup section in NAVconfig ...................................................................................................................................... 50 
IMU orientation tab ...................................................................................................................................................................... 51 
Primary antenna tab ................................................................................................................................................................... 52 
Secondary Antenna tab .............................................................................................................................................................. 53 
Lateral No-slip and Vertical No-slip tabs ............................................................................................................................ 55 
GNSS Differential Corrections tab .......................................................................................................................................... 57 
NTRIP ................................................................................................................................................................................................. 59