Pin 8 - +Vdc:
This pin is used to supply un-regulated DC power to the radio module. Maximum
input voltage should not 30Vdc.
Pin 9 – NC:
This pin is not used and should be left unconnected.
Pin 10 – Tx/Rx:
This pin is used to switch the radio between transmitting and receiving modes.
A low on this signal causes the radio module to enter transmitting mode. A high on this signal
causes the radio module to enter receive mode. If this signal is left unconnected, the radio
module will wake up in receive mode.