TS-7840 Nimbelink

The Nimbelink Cell Radio socket is intended for Nimbelink's Skywire embedded modems.

# Turn off both, only 1 can be on.
gpioset 3 16=0
gpioset 3 17=0

# For modems wanting 4V:
gpioset 3 16=1

# For modems wanting 3.3V:
gpioset 3 17=1

If your modem supports USB, this must be enabled.

gpioset 3 21=0

For UART based modems these may default to faster speeds than the default clock.

set_uart_baud --port 3 --baud 921600
picocom -b 115200 /dev/ttyS4

Note:

Some Nimbelink cell modems have a long startup and may not show up on USB for a minute before enumerating on USB.

Pin Description 11 GND 12 /dev/ttyS4 CTS 13 NC 14 3.3V 15 GND 16 GND 17 NC 18 NC 19 NC 20 GND

Pin Description 10 GND 9 GND 8 USB- 7 USB+ 6 4.7V 5 NC 4 GND 3 /dev/ttyS4 TXD 2 /dev/ttyS4 RXD 1 NIMBEL_PWR (3.3V or 4V)

While pin 1 commonly lines up with the antennas on the modems, the pin 1 orientation should be verified in your modem's datasheet.