I want the RG255C to use eDRX. It is supported by my BS, but it seems that the RG255C doens not enter eDRX. I can’t find any AT commands in the AT manual corresponding eDRX.
When I try AT+CEDRXS=? known from NB-IoT Modules the RG255C returns +CEDRX: (0-3),(4,8),(0-15). Can you provide me information what the corresponding parameters mean? For example what are AcT 4 and 8, if the second parameter is for AcT?
Thanks for the screenshot. I have an additional question: I want to put the device to sleep mode for low power consumption (currently with no network connection. I performed the following steps:
Execute AT+QSCLK=1
Execute AT+CFUN=0
The power consumption drops to 25-30mA at 5V (before DCDC converter).
Drive MAIN_DTR to high level.
The device still consumes about 25-30mA. This power consumption seems too high, compared to NB-IoT modules and even 5G NR modules such as RM520N. It seems like the device won’t switch into sleep mode. Do I miss something here?
I use the RG255C miniPCIe module and communicate via UART pins, so no USB connection.
I tried with a BG95 module on a mPCIe board from Quectel as well:
Execute AT+QSCLK=1
Execute AT+CFUN=0
The power consumption is 22mA at 5V (before DCDC converter).
Drive MAIN_DTR to high level.
The device’s current consumption drops to 18mA, which is still much higher than the 0.7mA given in the BG95 Hardware Design document.
To ensure that the used mPCIe Adapter board (sixfab mPCIe base shield) is not leacking any current, I shut down the BG95 using the AT+QPOWD command and the current consumption immediately dropped to 0-1mA. So the board is fine.
Sorry for the late reply.
I’m currently running the FW RG255CGLABR01A04M4G_01.002.01.002
I also tried your suggested flow, but the result is still the same.
Additional information:
I tried a third mPCIe Module: Quectel BG96. And with this modem sleep works. When I do the procedure as described above, the BG96 falls down to 1mA current consumption, as expected, which confirms my setup at least. I only switch the mPCIe modems from RG255C to BG96 to get this results. Switcing back to RG255C the modem again does come with a high current consumption at sleep mode. Since I can’t send any AT commands to the device in sleep mode, at least the mode seems set correctly, despite the high current.
So:
Quectel BG96 mPCIe CFUN=0 sleep: 1mA (avg)
Quectel RG255C mPCIe CFUN=0 sleep: 22 mA (avg)
How do I get the RG225C to enter sleep mode.
In the mean time of figuring out whats wrong with the sleep mode: Can you provide me information what the expected current consumption in eDRX with RG255C is? The hardware design document I have available is currenty blank (“TBD”) for these values. Knowing how much current the RG255C consumes in eDRX as given in the BG96 and BG95 hardware design documents would help me a lot for now.