User Manual

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3 RXD Input, weak
pull-up
URAT input port,
TTL level; 1k
resistance has been
connected in series
inside
4 TXD Output URAT output port,
TTL level; 1k
resistance has been
connected in series
inside
5 SET Input, internal 10k
pull-up resistance
Parameter setting
control pin, valid for
low level; 1k
resistance has been
connected in series
inside
6 ANT Input/output 433MHz antenna pin
7 GND Common ground
8 GND Common ground
9 NC No connection, used
in fixing, compatible
with HC-11 module
pin position
ANT1 ANT Input/output IPEX20279-001E-03
antenna socket
ANT2 ANT Input/output 433MHz spring
antenna solder eye
Pints 1-6 have two bonding pads respectively, and the outer half-hole bonding pad is
used in patch welding. When the inner bonding pad ANT2 of Pin 6 is used in patch
welding, the spring antenna can be welded with hands. The inner round-hole bonding
pads of Pins 1-5 are used to weld 2.54mm-spacing pin header, and can be directly
inserted onto user’s PCB socket.
Wireless serial port transparent transmission
(1) Simple introduction of working p principle