Regarding monitoring the external DC supply voltage on the iW-G62H, the 12V input voltage can be monitored from the Linux shell using the available API.
API used for this purpose is Check_adc_voltage.
Further information on how to use this API is available in the API Reference Manual.
Please connect with iWave representative for API reference manual.
For further inquiries, please get in touch with mktg@iwave-global.com
Please find the detailed G62H product information in the below link,