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very low impedance point on-board vehicle network. These points in the car
very low impedance point on-board vehicle network. These points in the car
are the battery terminals. Therefore, we recommend connecting the power of
are the battery terminals. Therefore, we recommend connecting the power of
FMM640 (wire GND and POWER) directly to the battery terminals. Another valid
option is to connect the wires to the main POWER cable inside the fuse box (if
option is to connect the wires to the main POWER cable inside the fuse box (if
there is none, then to the power supply where the fuses of vehicle’s computer
there is none, then to the power supply where the fuses of vehicle’s computer
vehicle computer. Connecting the GND at an arbitrary point to the mass of the
vehicle computer. Connecting the GND at an arbitrary point to the mass of the
car is unacceptable, as static and dynamic potentials on the line GND will be
car is unacceptable, as static and dynamic potentials on the line GND will be
unpredictable, which can lead to unstable FMB640 and even its failure.</nowiki><br /><br />''
unpredictable, which can lead to unstable FMM640 and even its failure.</nowiki><br /><br />''
• Avoid GNSS antenna placement under metal surfaces.<br />
• Avoid GNSS antenna placement under metal surfaces.<br />
• Avoid placing FMB640 device near car radio, speakers or alarm systems.<br />
• Avoid placing FMM640 device near car radio, speakers or alarm systems.<br />
• GNSS antenna must be placed so its state is as horizontal as possible (if antenna is leant
• GNSS antenna must be placed so its state is as horizontal as possible (if antenna is leant
• SIM card should be inserted in the module while the connector is plugged off (while
• SIM card should be inserted in the module while the connector is plugged off (while
module has no power).<br />
module has no power).<br />
[[Category:FMB640 Manual]]
[[Category:FMM640 Manual]]
