11
UM220 -IV M0
RF_IN
VCC_RF
Figure 4-3 UM220-IV M0 Passive Antenna Solution
4.4
Serial Port
UM220-IV M0
has one LVTTL serial port, for PC connection, please use a RS232 voltage
level converter.
UM220-IV
M0
PC
RS232
UART1
RS232 1
Figure 4-4 Connect COM to PC