Sim808 - no answer from rs232

Hi there, thanks for allow me to join this forum.

I have some issues working with SIM808, in fact, I am about to give up using these modules since I work with SIM800 modules for a long time, and have no issues and no complains wit them, but SIM808 is a pain in the ass… Sorry for the bad language.

#ISSUE 1

I buy some time ago this module:

aliexpress item 1005003377464961

It works so well that I start to be trusting it, but suddenly, it starts to NOT SEND SMS at all. All works well, but its simples ignore de X1A (Ctr_z) command to finalize text writing and send the SMS, I really don’t know what is the problem and already tried everything to solve, but no success. At this point, I ordered more two of them, all works well on these two new modules, and I give the command AT&V on both old and new modules, and this is what I got:

-RESPONSE FROM OLD MODULE (DEFECTIVE ONE)

AT&V

DEFAULT PROFILE

S0: 0

S3: 13

S4: 10

S5: 8

S6: 2

S7: 60

S8: 2

S10: 15

+CBST: 7,0,1

+CRLP: 61,61,48,6

V: 1

E: 1

Q: 0

X: 4

&C: 1

&D: 1

+CLTS: 0

+CREG: 0

+CGREG: 0

+CMEE: 0

+CSCLK: 0

+CIURC: 1

+CFGRI: 0

+CMTE: 0

+CANT: 0,0,10

+STKPCIS: 0

+CMGF: 0

+CNMI: 2,1,0,0,0

+CSCS: “IRA”

+VTD: 1

+CALS: 1

+CHF: 0

+CAAS: 1

+CBUZZERRING: 0

+DDET: 0

+MORING: 0

+SVR: 16

+CCPD: 1

+CSNS: 0

+CSGS: 1

+CNETLIGHT: 1

+SLEDS: 64,64,64,800,3000,300

+CSDT: 0

+CSMINS: 0

+EXUNSOL: 0

+SD2PCM: 1

+ECHARGE: 0

+IPR: 0

+IFC: 0,0

+ICF: 3,3

USER PROFILE

S0: 0

S3: 13

S4: 10

S5: 8

S6: 2

S7: 60

S8: 2

S10: 15

+CBST: 7,0,1

+CRLP: 61,61,48,6

V: 1

E: 1

Q: 0

X: 4

&C: 1

&D: 1

+CLTS: 0

+CREG: 0

+CGREG: 0

+CMEE: 0

+CSCLK: 0

+CIURC: 1

+CFGRI: 0

+CMTE: 0

+CANT: 0,0,10

+STKPCIS: 0

+CMGF: 0

+CNMI: 2,1,0,0,0

+CSCS: “IRA”

+VTD: 1

+CALS: 1

+CHF: 0

+CAAS: 1

+CBUZZERRING: 0

+DDET: 0

+MORING: 0

+SVR: 16

+CCPD: 1

+CSNS: 0

+CSGS: 1

+CNETLIGHT: 1

+SLEDS: 64,64,64,800,3000,300

+CSDT: 0

+CSMINS: 0

+EXUNSOL: 0

+SD2PCM: 1

+ECHARGE: 0

+IPR: 115200

+IFC: 0,0

+ICF: 3,3

ACTIVE PROFILE

S0: 0

S3: 13

S4: 10

S5: 8

S6: 2

S7: 60

S8: 2

S10: 15

+CBST: 7,0,1

+CRLP: 61,61,48,6

V: 1

E: 1

Q: 0

X: 4

&C: 1

&D: 1

+CLTS: 0

+CREG: 0

+CGREG: 0

+CMEE: 0

+CSCLK: 0

+CIURC: 1

+CFGRI: 0

+CMTE: 0

+CANT: 0,0,10

+STKPCIS: 0

+CMGF: 0

+CNMI: 2,1,0,0,0

+CSCS: “IRA”

+VTD: 1

+CALS: 1

+CHF: 0

+CAAS: 1

+CBUZZERRING: 0

+DDET: 0

+MORING: 0

+SVR: 16

+CCPD: 1

+CSNS: 0

+CSGS: 1

+CNETLIGHT: 1

+SLEDS: 64,64,64,800,3000,300

+CSDT: 0

+CSMINS: 0

+EXUNSOL: 0

+SD2PCM: 1

+ECHARGE: 0

+IPR: 115200

+IFC: 0,0

+ICF: 3,3

-RESPONSE FROM NEW MODULE (WORKING PERFECT)

AT&V

DEFAULT PROFILE

S0: 0

S3: 13

S4: 10

S5: 8

S6: 2

S7: 60

S8: 2

S10: 15

+CBST: 7,0,1

+CRLP: 61,61,48,6

V: 1

E: 1

Q: 0

X: 4

&C: 1

&D: 1

+CLTS: 0

+CREG: 0

+CGREG: 0

+CMEE: 0

+CIURC: 1

+CFGRI: 2

+CMTE: 0

+CANT: 0,0,10

+STKPCIS: 0

+CMGF: 0

+CNMI: 2,1,0,0,0

+CSCS: “IRA”

+VTD: 1

+CALS: 1

+CHF: 0

+CAAS: 1

+CBUZZERRING: 0

+DDET: 0

+MORING: 0

+SVR: 16

+CCPD: 1

+CSNS: 0

+CSGS: 1

+CNETLIGHT: 1

+SLEDS: 64,64,64,800,3000,300

+CSDT: 0

+CSMINS: 0

+EXUNSOL: 0

+SDMODE: 0

+ECHARGE: 0

+FSHEX: 0

+FSEXT: 0

+IPR: 0

+IFC: 0,0

+ICF: 3,3

+CSCLK: 0

USER PROFILE

S0: 0

S3: 13

S4: 10

S5: 8

S6: 2

S7: 60

S8: 2

S10: 15

+CBST: 7,0,1

+CRLP: 61,61,48,6

V: 1

E: 1

Q: 0

X: 4

&C: 1

&D: 1

+CLTS: 0

+CREG: 0

+CGREG: 0

+CMEE: 0

+CIURC: 1

+CFGRI: 2

+CMTE: 0

+CANT: 0,0,10

+STKPCIS: 0

+CMGF: 1

+CNMI: 2,1,0,0,0

+CSCS: “IRA”

+VTD: 1

+CALS: 1

+CHF: 0

+CAAS: 1

+CBUZZERRING: 0

+DDET: 0

+MORING: 0

+SVR: 16

+CCPD: 1

+CSNS: 0

+CSGS: 1

+CNETLIGHT: 1

+SLEDS: 64,64,64,800,3000,300

+CSDT: 0

+CSMINS: 0

+EXUNSOL: 0

+SDMODE: 0

+ECHARGE: 0

+FSHEX: 0

+FSEXT: 0

+IPR: 115200

+IFC: 0,0

+ICF: 3,3

+CSCLK: 0

ACTIVE PROFILE

S0: 0

S3: 13

S4: 10

S5: 8

S6: 2

S7: 60

S8: 2

S10: 15

+CBST: 7,0,1

+CRLP: 61,61,48,6

V: 1

E: 1

Q: 0

X: 4

&C: 1

&D: 1

+CLTS: 0

+CREG: 0

+CGREG: 0

+CMEE: 0

+CIURC: 1

+CFGRI: 2

+CMTE: 0

+CANT: 0,0,10

+STKPCIS: 0

+CMGF: 1

+CNMI: 2,1,0,0,0

+CSCS: “IRA”

+VTD: 1

+CALS: 1

+CHF: 0

+CAAS: 1

+CBUZZERRING: 0

+DDET: 0

+MORING: 0

+SVR: 16

+CCPD: 1

+CSNS: 0

+CSGS: 1

+CNETLIGHT: 1

+SLEDS: 64,64,64,800,3000,300

+CSDT: 0

+CSMINS: 0

+EXUNSOL: 0

+SDMODE: 0

+ECHARGE: 0

+FSHEX: 0

+FSEXT: 0

+IPR: 115200

+IFC: 0,0

+ICF: 3,3

+CSCLK: 0

The command that I use to send SMS is the same on both modules, but the old one simple don’t terminate the text writing by sending the x1A command, it stays on the text writing mode, really don’t know what is happening with this module. Any clue, pleas let me know.

#ISSUE 2

I buy two modules below for development:

aliexpress item 1005001867601931

None of these modules works. They can register to network, I can see this by observing the led blinking interval, but absolutely no RS232 response of any kind, in any baud rate os configuration possible. So, I buy more two from a different supplier, as below:

aliexpress item1005002982724393

One of them comes without a fuse soldered on the board, it simple don’t torn on, and the second says this message:


+EIND: 128

OK

+CSIM: PBK Ready


*Welcome Use GPRS GPS DTU

*V3.95M8GB_A_AG_C1


Really don’t know what to do. I guess this module is to complicate do deal with.

Any help will be very useful.

Thanks.