Features
It work with Modbus or transparent protocol, not work with LoRaWAN.
The devices to be used in a loop group for data transmission. It is like an RS-485 in semi-duplex but wireless.
In the loop group just pick one LoRa device to work as a MASTER and the other LoRa devices are SLAVE.
These devices have general LoRa features such as long range, low packet size and loose in data collecting.
We recommend the packet not over 100 bytes per second and the condition could accept data lost.
Generally it work good for environment data collection to get long trend. It’s not suitable for instant On/Off work.
Distance of LoRa transmission is long range subject to antenna to be Line-Of-Sight from Master to Slaves.
 
Specifications
LoRa : Semtech SX1272
ISM band 862 ~ 936MHz
Receiver Sensitivity : -137 dBm
Transmit Output Power : 20 dBm
Sleep Current : 3uA (at power down state)
TX current < 140 mA@20 dbm , RX current < 10 mA
Security processor ( 128/192/256 bits AES )
Packet engine up to 256 bytes with CRC
Antenna : SMA Type , 2 dBi , changeable 
Distance : Up To 5000 Meters in free space
Data Rate : 0.244 ~ 18.2K bps (LoRa) / 300 K bps (FSK)
Application mode : Star
 
Serial Port
Port : RS-232/422/485 * 1 port ( auto Detect )
RS-232 : Rx , Tx , GND , RTS , CTS ( DB9 female )
RS-422 : Tx+ , Tx-, Rx+ , Rx- (Surge Protect )
RS-485 : Data+ , Data- (Surge Protect)
Built –in RS-422/RS-485 Terminal Resistor
Speed : 9600 bps〜
Parity : None , Odd , Even
Data Bit : 7, 8 / Stop Bit : 1 , 2
 
Setup Tool : Windows Utility
Power : DC 9 ~ 24V / 150ma @ 9V , 60ma @ 24V
Led Lamp : SYS (green) , Rx(red) , Tx(green)
Environment: Operating Temperature: -10℃〜70℃  / Storage Temperature: -20℃〜80℃
Dimensions : 100 * 90 * 25 mm ( W * D * H )
Weight : 150 gm ( not include power )