Sferalabs Iono Pi Max v2 3+ Lite User Manual page 47

Register 30
Bit 15-0 TIMEOUT: heartbeat timeout, in seconds (default = 60)
Register 31
Bit 15-0 DOWN DELAY: forced power cycle delay after timeout expiration, in seconds
(default = 60)
Register 32
Bit 15-0 SD SWITCH: SD switch control after power cycle triggered by watchdog
0 = SD switch disabled (default)
N > 0 = switch boot from SDA/SDB after N consecutive watchdog resets, if
no heartbeat is detected. A value of N > 1 can be used with MOD set to 1
only; if MOD is set to 0, then SD SWITCH is set automatically to 1
POWER SUPPLY
ADDR
15 14 13
36
37
38
39
Register 36
Bit 0 DM: down enable mode
0 = immediate: the power cycle is initiated as soon as GPIO18 is set to high
(default)
1 = arm: setting GPIO18 high will arm the shutdown procedure, but will not
start the power cycle until it goes low again (i.e. set low programmatically or
Raspberry Pi switched off)
Bit 1 UM: up mode
0 = main power: if shutdown is enabled when the main power is not present,
the Iono Pi Max is powered down after the shutdown wait time, and powered
up again only when the main power is restored (default)
1 = always: if shutdown is enabled when the main power is not present, only
the Raspberry Pi is turned off, and the power is always restored after the
power-off time, even if running on battery, with no main power present
Bit 2 SD: SD switch
0 = SD switch at power cycle disabled (default)
1 = switch boot from SDA/SDB at every power cycle
47
BYTE 1
12 11 10 9
DOWN DELAY
8 7 6 5
OFF TIME
UP DELAY
BYTE 0
4 3 2 1
SD UM DM
Iono Pi Max User Guide
R/W
0
R/W
R/W
R/W
R/W