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20 SPAN-IGM User Manual Rev 2
Chapter 2 SPAN Installation
If the SPAN-IGM is installed in a vehicle, NovAtel recommends a back-up battery be placed between the
receiver and its voltage supply to act as a power buffer. When a vehicle engine is started, power can dip
to 9.6 VDC or cut-out to ancillary equipment causing the receiver and IMU to lose lock and calibration
settings.
Figure 6: Battery Isolator Installation
2.3.5 Connect a Computer to the SPAN-IGM
You can connect a computer to the SPAN-IGM using a serial connection or a USB connection.
2.3.5.1 Connect a Computer Using a Serial Connection
Connect the computer to the COM2 port on the SPAN-IGM. The COM2 serial port is available on the
MAIN connector. See Figure 3, Typical SPAN-IGM Set Up – Serial Port on page 16.
If you are using a NovAtel interface cable (part number 01019014):
1. Connect the interface cable to the MAIN connector on the SPAN-IGM.
2. Connect the DB9 connector labelled User Port to the serial port on the computer.
If you are creating a custom interface cable, refer to Appendix A, Technical Specifications on page 52 for
the MAIN connector pin out.
Vehicle Main
Battery
Auxiliary
Battery
Battery Isolator
from Vehicle
Alternator
to Vehicle Electrical
System
An additional serial port, COM3, is optionally available on the AUX connector. This port is
disabled by default. For information about enabling COM3, see COM3 Serial Port on
page 22.
By default, COM2 operates as an RS-232 serial port. To change COM2 to operate as an
RS-422 serial port, see Enable RS-422 serial connections on page 22.