MODBUS and serial disable

Question

We use custom board with NRF52840 and a MODBUS CO2 sensor. We are struggling with power consumption when the serial is enabled. The goal is to take measurements and then put the board to sleep, after a certain time, wake board up and take new measurements. Currently, the idle power consumption is about 1.2 mA. When I disabled the serial in the config file, we got the power consumption down to 300 µA. However, MODBUS requires the serial. Is it possible to disable the serial before putting the board to sleep and reinitialize it after waking up so that MODBUS continues to work?

runsiv · Accepted Answer

I'm just playing a bit around with the Modbus RTU client and server sample using two DKs. I don't have access to my PPK today but I see no issue when I add the following pm_device_action_run(uart,PM_DEVICE_ACTION_SUSPEND); k_msleep(sleep); pm_device_action_run(uart,PM_DEVICE_ACTION_RESUME); Log Client side [00:00:15.360,961] mbc_sample: Coils state 0x07 [00:00:20.388,000] mbc_sample: Coils state 0x00 server side [00:00:18.276,062] mbs_sample: Coil write, addr 2, 1 [00:00:23.289,672] mbs_sample: Coil read, addr 0, 1 [00:00:23.289,672] mbs_sample: Coil read, addr 1, 1 [00:00:23.289,703] mbs_sample: Coil read, addr 2, 1 [00:00:23.303,222] mbs_sample: Coil write, addr 0, 0 [00:00:23.303,222] mbs_sample: Coil write, addr 1, 0 [00:00:23.303,222] mbs_sample: Coil write, addr 2, 0 [00:00:28.316,864] mbs_sample: Coil read, addr 0, 0 [00:00:28.316,864] mbs_sample: Coil read, addr 1, 0 [00:00:28.316,894] mbs_sample: Coil read, addr 2, 0 [00:00:28.329,193] mbs_sample: Coil write, addr 0,

MODBUS and serial disable

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