HL6528 GPS problem

IoT Modules Legacy HL Series
1

Hello,
We are develop m2m device. We have some problems with GPS on HL6528-G28V
SN GY419100250410

  1. When we switch on device
    AT+GPSSTART=0
    OK
    GPSEVINIT:1
    GPSEVSTART:1
    GPSEVPOS:0

  2. Switch on power on active antenna and built-in amplifier.

AT+GPSCONF=1,0
OK
3. Tune output stream(common UART)
AT+GPSPVT=1,1,FFFF
CONNECT

Then there are nothing in terminal

or at other time all work fine navigation package recv once per second.

There are no stable work.

Can’t switch back to command mode with “+++”
What we doing wrong?
Lines DTR, RTS set on “0” (Can control from MCU) Maybe they must be tuned?

2

I have similar problem with Modem HL6548 …
Only Getting all Zeros ‘0’;
My command sequence is as follows - I am using only external antenna with internal LNA…

004.630130 Gprs tx: ATE0
004.633802 Gprs rx: OK

004.633834 Gprs tx: ATE0

004.637421 Gprs rx: OK

11:23: 005.643110 Gprs tx: AT+CCID?
005.646647 Gprs rx:
005.649199 Gprs rx: +CCID: xxxxxxxxxxxxxxxxxxxxxxx
005.649254 Gprs GprsReadSimCardNumber(): xxxxxxxxxxxxxxxxxxxxx

11:26: 009.649112 Gprs tx: AT+CFUN=1,1
009.658188 Gprs rx:
009.658537 Gprs rx: OK
015.148360 Gprs rx: +SIM: 1
015.148377 Gprs GprsStartGPS(): OK

11:36: 019.148143 Gprs tx: AT+GPSINIT=41
019.151974 Gprs rx: AT+GPSINIT=41
019.152572 Gprs rx: OK

11:40: 023.447925 Gprs tx: AT+GPSINIT?
023.451314 Gprs rx: AT+GPSINIT?
023.452530 Gprs rx: +GPSINIT: 41
023.453218 Gprs rx: OK
023.453233 Gprs GprsStartGPS(): OK

11:44: 027.452999 Gprs tx: AT+GPSNMEA=0
027.456805 Gprs rx: AT+GPSNMEA=0
027.457220 Gprs rx: OK

11:48: 031.457005 Gprs tx: AT+GPSPVT=1,10,FFFF
031.461747 Gprs rx: AT+GPSPVT=1,10,FFFF
031.462220 Gprs rx: OK

11:52: 035.462002 Gprs tx: AT+GPSSTART=0
035.465769 Gprs rx: AT+GPSSTART=0
035.466220 Gprs rx: OK

11:56: 039.466002 Gprs tx: AT+GPSCONF=0,0
039.470309 Gprs rx: AT+GPSCONF=0,0
039.470639 Gprs rx: OK

12:00: 043.470421 Gprs tx: AT+GPSCONF=1,2
043.474261 Gprs rx: AT+GPSCONF=1,2
043.474593 Gprs rx: OK

12:04: 047.474376 Gprs tx: AT+GPSCONF=10,0
047.478640 Gprs rx: AT+GPSCONF=10,0
047.478972 Gprs rx: OK

12:08: 051.478771 Gprs WAIT FOR GPS LOCATION : REFERESH RATE IS 10 SECOND…

12:13: 056.218456 Gprs rx: +GPSPVT:0,00:00:00,00/00/0000,NO FIX,N 000 00’00.00",E 000 00’00.00",+0000m
056.221114 Gprs rx: +GPSPVT:1,000.0deg,000m/s
056.223628 Gprs rx: +GPSPVT:2,00SV,0.0HDOP,0,0.0
056.229671 Gprs rx: +GPSPVT:3,8,1,[20,N,0],[10,N,0],[22,N,0],[18,N,0],[31,N,0],[27,N,0]
056.235387 Gprs rx: +GPSPVT:3,8,2,[9,N,0],[8,N,0],[19,N,0],[29,N,0],[6,N,0],[17,N,0]
056.241207 Gprs rx: +GPSPVT:3,8,3,[4,N,0],[11,N,0],[2,N,0],[21,N,0],[16,N,0],[28,N,0]
056.247206 Gprs rx: +GPSPVT:3,8,4,[30,N,0],[25,N,0],[26,N,0],[15,N,0],[13,N,0],[14,N,0]
056.252838 Gprs rx: +GPSPVT:3,8,5,[32,N,0],[5,N,0],[7,N,0],[3,N,0],[1,N,0],[12,N,0]
056.259967 Gprs rx: +GPSPVT:3,8,6,[165,N,0],[90,N,0],[22784,N,0],[23040,N,0],[23296,N,0],[23552,N,0]
056.267540 Gprs rx: +GPSPVT:3,8,7,[23808,N,0],[24064,N,0],[24320,N,0],[16384,N,0],[16640,N,0],[16896,N,0]
056.272967 Gprs rx: +GPSPVT:3,8,8,[17152,N,0],[17408,N,0],[17664,N,0],[17920,N,0]

12:23: 066.478179 Gprs rx: +GPSPVT:0,00:00:00,00/00/0000,NO FIX,N 000 00’00.00",E 000 00’00.00",+0000m
066.478227 Gprs rx: +GPSPVT:1,000.0deg,000m/s
066.478269 Gprs rx: +GPSPVT:2,00SV,0.0HDOP,0,0.0
066.478349 Gprs rx: +GPSPVT:3,8,1,[20,N,0],[10,N,0],[22,N,0],[18,N,0],[31,N,0],[27,N,0]
066.478434 Gprs rx: +GPSPVT:3,8,2,[9,N,0],[8,N,0],[19,N,0],[29,N,0],[6,N,0],[17,N,0]
066.478519 Gprs rx: +GPSPVT:3,8,3,[4,N,0],[11,N,0],[2,N,0],[21,N,0],[16,N,0],[28,N,0]
066.478606 Gprs rx: +GPSPVT:3,8,4,[30,N,0],[25,N,0],[26,N,0],[15,N,0],[13,N,0],[14,N,0]
066.478689 Gprs rx: +GPSPVT:3,8,5,[32,N,0],[5,N,0],[7,N,0],[3,N,0],[1,N,0],[12,N,0]
066.478787 Gprs rx: +GPSPVT:3,8,6,[23,N,0],[24,N,0],[22784,N,0],[23040,N,0],[23296,N,0],[23552,N,0]
066.478894 Gprs rx: +GPSPVT:3,8,7,[23808,N,0],[24064,N,0],[24320,N,0],[16384,N,0],[16640,N,0],[16896,N,0]
066.478980 Gprs rx: +GPSPVT:3,8,8,[17152,N,0],[17408,N,0],[17664,N,0],[17920,N,0]

12:34: 077.216188 Gprs rx: +GPSPVT:0,00:00:00,00/00/0000,NO FIX,N 000 00’00.00",E 000 00’00.00",+0000m
077.218580 Gprs rx: +GPSPVT:1,000.0deg,000m/s
077.221184 Gprs rx: +GPSPVT:2,00SV,0.0HDOP,0,0.0
077.227211 Gprs rx: +GPSPVT:3,8,1,[20,N,0],[10,N,0],[22,N,0],[18,N,0],[31,N,0],[27,N,0]
077.232944 Gprs rx: +GPSPVT:3,8,2,[9,N,0],[8,N,0],[19,N,0],[29,N,0],[6,N,0],[17,N,0]
077.238753 Gprs rx: +GPSPVT:3,8,3,[4,N,0],[11,N,0],[2,N,0],[21,N,0],[16,N,0],[28,N,0]
077.244760 Gprs rx: +GPSPVT:3,8,4,[30,N,0],[25,N,0],[26,N,0],[15,N,0],[13,N,0],[14,N,0]
077.250386 Gprs rx: +GPSPVT:3,8,5,[32,N,0],[5,N,0],[7,N,0],[3,N,0],[1,N,0],[12,N,0]
077.258153 Gprs rx: +GPSPVT:3,8,6,[165,N,2486],[50341,N,0],[22784,N,0],[23040,N,0],[23296,N,0],[23552,N,0]
077.265606 Gprs rx: +GPSPVT:3,8,7,[23808,N,0],[24064,N,0],[24320,N,0],[16384,N,0],[16640,N,0],[16896,N,0]
077.271143 Gprs rx: +GPSPVT:3,8,8,[17152,N,0],[17408,N,0],[17664,N,0],[17920,N,0]

12:44: 087.478179 Gprs rx: +GPSPVT:0,00:00:00,00/00/0000,NO FIX,N 000 00’00.00",E 000 00’00.00",+0000m
087.478227 Gprs rx: +GPSPVT:1,000.0deg,000m/s
087.478269 Gprs rx: +GPSPVT:2,00SV,0.0HDOP,0,0.0
087.478349 Gprs rx: +GPSPVT:3,8,1,[20,N,0],[10,N,0],[22,N,0],[18,N,0],[31,N,0],[27,N,0]
087.478434 Gprs rx: +GPSPVT:3,8,2,[9,N,0],[8,N,0],[19,N,0],[29,N,0],[6,N,0],[17,N,0]
087.478519 Gprs rx: +GPSPVT:3,8,3,[4,N,0],[11,N,0],[2,N,0],[21,N,0],[16,N,0],[28,N,0]
087.478606 Gprs rx: +GPSPVT:3,8,4,[30,N,0],[25,N,0],[26,N,0],[15,N,0],[13,N,0],[14,N,0]
087.478689 Gprs rx: +GPSPVT:3,8,5,[32,N,0],[5,N,0],[7,N,0],[3,N,0],[1,N,0],[12,N,0]
087.478787 Gprs rx: +GPSPVT:3,8,6,[23,N,0],[24,N,0],[22784,N,0],[23040,N,0],[23296,N,0],[23552,N,0]
087.478894 Gprs rx: +GPSPVT:3,8,7,[23808,N,0],[24064,N,0],[24320,N,0],[16384,N,0],[16640,N,0],[16896,N,0]
087.478980 Gprs rx: +GPSPVT:3,8,8,[17152,N,0],[17408,N,0],[17664,N,0],[17920,N,0]

…same pattern repeat at every 10 seconds…

I don’t see any correct data at all. Please Help