Frequently asked questions¶
JP150PCB 1.3PCB 1.4Jan PřibyslavskýThis page does not apply to the product or PCB revision chosen in the header.
Do I have to update the firmware? No. A module keeps working on the release it has. The release notes say what a newer release changes and which known issues it fixes; update when one of them matters to you. Check for updates shows how.
Does an update keep my settings and my DSP program? Yes. The settings are kept (the first start after an update from 26.8.0 rebuilds some of them once, see Release 26.10.1). The DSP program is kept unless you choose to write the default program during the update; MuraLink asks, and nothing is preselected.
Can I go back to an older firmware?
Only down to the module's rollback floor: the bootloader refuses a package whose security counter
is below the floor, which only rises. The floor is shown by MuraLink and SYS:BOOTLOADER:INFO?
(How updates work).
Can PCB 1.3 and PCB 1.4 run the same firmware? Yes, from 26.10.1 on, one firmware serves both; the module configures itself from its factory record. A PCB 1.3 module that still runs 26.8.0 cannot take an update bundle by itself; its first update is arranged with support.
Can I write my own DSP program? Yes, with SigmaStudio 4.7 from the starter project. Keep its INPUTS_PROCESSING board, which carries the input mux and the level meter the firmware uses (IPAT and parameters), and write the result into the boot memory of your board revision (Writing the boot memory).
Where is the DIP switch on PCB 1.4?
There is none. The DSP self boot is a setting (DSP:SELFBOOT), the master clock is selected by
the firmware, and the MCU boot pin is a solder jumper for service (Configuration).
Why does the module not power down on silence?
The automatic power-down is off by default (SYS:POWER:AUTO), and a residual signal above the
threshold counts as audio. Auto power-down explains the delay,
the threshold and the target level; on PCB 1.4 a 12 V trigger with priority can also keep the
module awake.
Why does Wi-Fi stop answering in standby?
STANDBY is the only level that removes power from the Wi-Fi module. SLEEP keeps it powered, so
the module stays reachable on the network and wakes when you play to it
(Power levels).
Can two modules play together? Yes, as a True Wireless Stereo pair over Bluetooth: one is the Primary the phone connects to, the other the Secondary. Both units play the full stereo signal; a channel split is done in the DSP program (TWS: about and terms).
Can I control the module from my own software? Yes. The control interface speaks a plain-text command set over the USB virtual COM port and over UART1; the whole set is in the command reference and the rules on the Protocol page. MuraLink uses nothing else.
Where do I find the serial number?
*IDN? answers it as its third field, for example JP150-0001-0021; MuraLink shows it on Device >
Status. It is the serial number of the factory record, written once at production.
What does a red status LED mean? A red LED with a dim white step every second is the safe state: the firmware does not support the board's factory record. A plain red blink is a fatal error. Both are on Indicators and LEDs.
Do I need a driver for USB? No. The module is a USB audio device and a virtual COM port with the drivers Windows, macOS and Linux bring along. The update mode is a DFU device that MuraLink talks to directly.