Question

I want to set up TRB142 as RS232 Modem and use AT-command (Docklight) to dial up another TRB142 modem.

Fw: TRB1_R_00.02.06.1

We use dial-up with Moxa GPRS modem, but they are end-of-sale and we now want to try 4G mobile modem.

I have enabled RS232 in both ends and I'm able to dial in by ATD.

I get "RING" in remote end, but when answer (ATA or ATS0=1) the modems respond with "NO CARRIER" at both ends.

Any ideas?

Answer 1

Hello,

Regarding this issue of yours, I would like you to send a copy of a screenshot of what commands are you executing in Docklight.

Also maybe these links will help for the ATD and ATA commands:
https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=90
https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=91

Waiting for your response.

Regards,
Mellow

Comments

Thanks,

local end

Regards,
Tor

---

Remote end:

Regards,

Tor

---

Hello,

Regarding your issue could you try add ";" in the ATD command it should be "ATD58001000009;" kindly let me know the results.

Regards,

Mellow

---

Thanks,

There's a connecting, but I do not get respons "CONNECT" and modems do not get into data mode, still staying in command mode.

Local End:

21.06.2021 12.56.26.253    [SEND] - ATD580010000001;

21.06.2021 12.56.26.274 [RECEIVE] -

OK

21.06.2021 13.00.34.044    [SEND] - :451 ## Try to send data ##

21.06.2021 13.00.40.934    [SEND] - ATD580010000001;

21.06.2021 13.00.40.957 [RECEIVE] -

OK

BUSY

21.06.2021 13.00.56.060    [SEND] - ATD580010000001;

21.06.2021 13.00.56.082 [RECEIVE] -

OK

Remote End:

RING

13:00:02    [SEND] - ATA ## Auto answer set, S0=1 ##

13:00:02 [RECEIVE] -

ERROR

13:00:49    [SEND] - ATH ## HANG UP ##

13:00:50 [RECEIVE] -

OK

RING

---

Hello,

Could you explain to me the scenario you want to implement for this?

From what I understand you want to dial a number and once the call is received on the other end it will connect to data mode?

Regards,
Mellow

---

Correct.

I want to dial a number and as soon remote end answer I want data to be transferred.

Remote end will be in auto answer, S0=1
Remote end will use hw handshake (RTS/CTS) and when answer modem put CTS high. Data from remote end will be transferred to local end.

Tor