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12 V trigger

JP150PCB 1.4since 26.10.1Jan PřibyslavskýThis page does not apply to the product or PCB revision chosen in the header.

PCB 1.4 has a trigger input for the usual 12 V trigger signal of a preamplifier or source, or for a push button. The firmware offers three modes. On PCB 1.3 the settings are accepted and stored but have no effect.

Modes

Mode Behaviour
OFF (default) The input is ignored.
FOLLOW A change to high returns the module to NORMAL; a change to low takes it to the trigger target level. The level found at start counts too: a module started without a trigger powers down about 5 s after start, and switching to FOLLOW applies the current level at once. The encoder and the control interface still override, until the trigger changes again.
ONOFF The input is a push button. A press while powered down wakes the module; a press that begins in NORMAL and is held for one second powers it down. The press that wakes never powers down, and the level found at start is not a press.

Settings

Setting Values Default
Mode OFF, FOLLOW, ONOFF OFF
Target level PWRSTAGE_IDLE, PWRSTAGE_OFF, SLEEP, STANDBY SLEEP
Priority over automatic decisions on, off on

All three settings are stored and survive a power cycle. With the priority on, in FOLLOW mode, the automatic decisions never contradict the trigger: no silence power-down while the trigger is high, no audio wake while it is low. With it off, automatic power-down and the audio wake work as before, beside the trigger.

A new level counts after 0.1 to 0.2 s; shorter pulses change nothing. Nothing is acted on in the first 5 s after start. A SigmaStudio session on the DSP bus and a pending power-stage retry take precedence over the trigger.

Device > Power Modes, section 12 V Trigger: Trigger input shows the level read at the input, Mode and Power down to set the mode and the target level, and the check box Trigger overrides automatic power-down and audio wake is the priority; Apply trigger settings sends the three to the module. On a board without the input the section is greyed out.

Device, Power Modes
Device > Power Modes: the power level, the automatic power-down and, on PCB 1.4, the 12 V trigger.

Over the control interface

Setting Commands
Input level SYS:TRIG? answers 1, 0, or N/A on PCB 1.3
Mode SYS:TRIG:MODE?, SYS:TRIG:MODE with OFF, FOLLOW or ONOFF
Target level SYS:TRIG:TARGET?, SYS:TRIG:TARGET with the level
Priority SYS:TRIG:PRIORITY?, SYS:TRIG:PRIORITY with 0 or 1

The syntax and the answers are in the SYS:TRIG reference.

Wiring

JST PH, 2 pins (12V TRIGGER): pin 1 trigger, pin 2 GND. 3.3 V to 12 V reads as active; the input has a series resistor and a 3.3 V clamp. See Connectors and pinouts.