Heacent TK103A - Check IMEI; Terminal (local) Time Setting; TCP;UDP switch; Configure parameters by USB

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Press the reset button for 1 second, hardware of tracker device will
reset.
6.29 Check IMEI
Send SMS command "imei+password" to the unit. E.g. Send SMS
command "imei123456" to the tracker device, an IMEI number in 15 digits
will reply to your cell phone.
6.30 Terminal (local) Time Setting
6.30.1 Send SMS command “time+space+zone+password+space+time” to the
tracker unit, If succeed, It will reply “time OK”
6.30.2 For example: Send SMS “time zone123456 8”, 8 is Chinese time zone, If
your country time zone is minus, send SMS “time zone123456 -8”.
6.31 TCP/UDP switch
Command:"gprs+password,1,1" switch to UDP mode.
Command: "gprs+password,0,0" switch back to TCP mode, this is the
default mode.
6.32 Configure parameters by USB
Find the USB cable in the package, and copy the serial port tool to
computer, connect the tracker with computer and open serial port tool, then
choose correct com port, baud rate is 19200, send serial port command
(Tick "send new " on SSCOM interface): $SET GT PARA, tracker will
return the sample format of the command, send appropriate commands