php - GPS tracking data string format for GRTQ device

I get GPS data from tcp (php socket), but for some devices (GRTQ) I will get an unreadable string.

First devices sends:

*HQ,XXXXXX,41,4#V1,time,A,**Lat**,N/S,**Lng**,W/E,000.00,000,date,FFFFFBFF,432,35,32448,334

then sends:

*HQ,XXXXXX,V9,time,A,**Lat**,N/S,**Lng**,W/E,000.10,000,date,,Caller ID,FFFFFBFF#

then sends:

$A  grQ05Ah@‘)���ÿÿûÿÿ����°#~À‚¡U

What's the meaning of this last string?

The model of the device is GRTQ.