Chapter 3 SPAN Operation
OEM7 SPAN Installation and Operation User Manual v14
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Configure the DMI
1. Send the following command to enable a DMI on the UIC wheel sensor inputs.
DMICONFIG DMI1 ENABLE IMU
2. Send the following commands to log the DMI data.
LOG DMICONFIGA ONCHANGED
LOG RAWDMIA ONNEW
LOG INSUPDATESTATUSA ONNEW
3. Check the
RAWDMI
log to ensure the DMI is producing data.
4. Check the
INSUPDATESTATUS
log to ensure the DMI is being used in the SPAN solution.
If there is no DMI data being produced or the DMI status is not USED, refer to
Refer to the
OEM7 Commands and Logs Reference Manual
for information about the commands and logs used
in this section.
3.7.7 DMI Connected to an Intermediate Processor
NovAtel’s OEM7 receiver cards do not handle DMI encoded signals natively. If using a receiver card, an inter-
mediate processor is required to convert DMI pulses into NovAtel commands (RAWDMI).
Figure 33: DMI through Intermediate Processor Setup
below shows an overview of a DMI connected to the
receiver through an intermediate processor.
Figure 33: DMI through Intermediate Processor Setup
DMI Data Collected using an Intermediate Processor
Typical DMI hardware generates wheel ticks constantly as the wheel rotates. When using an intermediate pro-
cessor, the wheel ticks are sent to the processor. The processor either accumulates the wheel ticks or uses the
DMI data to calculate the current velocity. The count or velocity data is sent to the OEM7 receiver though a serial
communication line using the
RAWDMI
command. The
RAWDMI
command should be timed using the 1PPS
output from the receiver.
