Question

Hi

Does the power supply for the RUT955 provide any interface for reading the current provided voltage?

 I imagine there is at least some GPIO interface available to the Linux kernel that we can use for this.

Answer 1

Hello,

Power supply voltage measurement is not connected to processor GPIO pin, instead it uses LTE module ADC input 0. You can read this value with command gmsctl -A AT+QADC=0. This will return +QADC: <status>,<value>. Here <status> indicates if ADC value was read successfully: 0 - Fail, 1 - Success, and <value>  is ADC voltage value in mV. However, PSU voltage is not directly measured, instead it goes via voltage divider which ratio is 14.7/164.7. So to get PSU voltage you have to calculate it with formula: PSU_voltage = ADC_voltage * 164.7/14.7.

Comments

The previous command was for Quectel modems, but your router has a different manufacturer's module.

I cannot test it on the spot, but based on the manual the command should look similar to gsmctl -A 'AT+ADCREAD=0'

---

Seems to be working !

Thanks for your time !

Can I access to the manual you speak about? I can't find it.

---

Sent you a private message.

---

Hello, The PSU value I get with this voltage divider ratio on a RUTX14 seems incorrect. Is there a voltage divider ratio for the RUTX14 as well?

Thank you in advance,
Zoek

---

Hello,

Unfortunately, input voltage measurement is not possible with RUTX14, as the devices modem's ADC pins are not connected to anything.

Apologies for the inconveniences.

Best regards,