The chip has 2 UART ports, may be CASIC is on the UART1 while NMEA is on UART0?
That would explain why we get no response. Needs checking with @Gordon.
@HughB started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
That would explain why we get no response. Needs checking with @Gordon.