Rev 1.5 Jul.08 33
4: MP Modem Operation
• Status indicators
• 3G Watcher software
• Establishing
connections
OperatingtheMPmodemrequiressomeknowledgeofboth
theMPmodemhardwareandthe3GWatchersoftware.This
chapterdescribesthebasicsofeach.
Turning the MP modem on and off
IftheMPmodemisinstalledinavehicle,thewayinwhichthe
MPmodemiswireddetermineshowitispoweredonandoff.
InmostcasesthepowersupplyfortheMPmodemisthe
vehicleʹselectricalsystemandtheMPmodemispoweredon
andoff
inoneoftheseways:
• Engineon.TheMPmodemispoweredonlywhenthe
ignitionison.(TheMPmodemisonlyonwhentheengine
ison.)
—or—
• Accessoryon.TheMPmodemispoweredwhenthe
ignitionisswitchedtoʺAccessoriesʺ.(ThisallowstheMP
modemtobepoweredwhentheengineisoff.)
—or—
• Separatelyswitched.TheMPmodemisconnectedtoa
separateon/offswitchsothatitcanbeturnedonandoff
independentlyoftheengineandvehicleaccessories.
RatherthancuttingpowertotheMPmodem,theignitionkey
orpowerswitchallowstheMPmodemtoperformacontrolled
shutdownsequencethatavoidsdataloss.(Youcanalsosetthe
MPmodemtowaitupto240
minutesafterthepowerswitch
hasbeenturnedoffbeforeitshutsdown.)