As the embedded microcontroller in the NPR modem responds at its default speed of 921600bps only to interactive communications, a serial command delayer is needed for automated commands to be sent to the NPR-modem.
This serial command delayer (scd) belongs to a NPR connected Raspi (or similar) sending the automated commands eg. by cronjob.
gcc -Wall -o scd scd.c;chmod u+x scd
scd [device] [bitrate] [delay in ms] ['command']
scd /dev/ttyACM0 921600 20 'radio on\r\n' # turns radio on
scd /dev/ttyACM0 921600 20 'status\r\n' # shows status page
scd /dev/ttyACM0 921600 20 '\03' # send CTRL-C to stop status page
scd displays received serial answers after timeout.
'\r\n' CR, Linefeed is required to finish command.
'\03' is the character to send for a CTRL-C
precompiled version for AMD64 and Raspberry Pi are availble too.