Uotek UT-9921 User Manual

UT-9921 LoRa to RS-232/485/422
Converter
User Manual
1. Overview
LoRa is a long-range wireless communication solution.
Compared to GPRS and 4G solutions, LoRa does not require a
monthly network access fee and has a longer range than WiFi and
Zigbee. As a result, LoRa is increasingly used in small data
long-distance communication. UT-9921 utilizes SEMTECH's LoRa ™
patented modulation technology, which can achieve a reception
sensitivity of -142dBm and an output power of +22dBm, with an
outdoor line-of-sight communication range of 5km. It features
long-range, low power consumption, and strong anti-interference
capabilities. UT-9921 is a serial port to LoRa converter, offering
three types of serial interfaces: RS-232/485/422.
2. Product Features
◎Data Interfaces: RS-232/422/485 SMA female antenna interface
◎Frequency Range: 464-515 MHz
◎Modulation: Supports both LoRa direct-sequence spread
spectrum technology and GFSK (Gaussian Frequency Shift Keying)
transmission
◎Wireless Channels: 255 selectable channels, each with a 0.2MHz
interval
◎Network Topology: Star, tree, chain, mesh network
◎Transmission Modes: Transparent transmission and fixed-point
transmission
◎Serial Transmission Rate: Configurable from 1200 to 115200bps
◎Air Transmission Rate: 6 levels adjustable
(0.3/1.2/2.4/4.8/9.6/19.2Kbps)
◎Power Supply: DC9V-30V, 12V/50mA (max)
◎Transmission Distance: Wireless carrier wave up to 5000 meters
◎Reception Sensitivity: -142dBm
◎Transmission Power: 22dBm, adjustable in multiple steps of
1dBm
◎Antenna Connection: SMA male rod antenna / suction cup
antenna
◎Surge Protection: Power, differential mode 1KV, common mode
2KV (1.2/50μS)
Signal, RS-485/422: differential mode 1KV, common mode 2KV
(10/700μS)
RS-232: 600W
◎ESD Protection: Contact 6kV, air 8kV
◎Dimensions: 97mm×65mm×22mm (excluding antenna)
◎Weight: 120g
◎Operating Environment: -40°C to 85°C, relative humidity
from 5% to 95%
3. Hardware Description
3.1 Indicators
PWR: Red; stays on when powered normally.
TXD: Green; serial transmission indicator (flashes when sending
data).
RXD: Yellow; serial reception indicator (flashes when receiving
data).
3.2 Button Definitions
Reset:
1. Short press (1 second): Enters command mode.
2. Long press (5 seconds): Restores factory settings.
4. Terminal Pins
1. RS-232 Pin Definitions
No. Signal Description
2 RXD RS-232 Receive
3 TXD RS-232 Transmit
5 GND Signal Ground
7 RTS Request to Send
8 CTS Clear to Send
NC Floating (Unused)
1、4、6、9
2. RS-485/422 Pin Definitions
No. Signal Description
1 T/R+ RS-485+: Transmit Positive
2 T/R- RS-485-: Transmit Negative
3 RXD+ RS-422 Receive+: Receive Positive
4 RXD- RS-422 Receive-: Receive Negative
5. Communication Connection Diagrams
1. RS-485 Point-to-Point / Half-Duplex
2. RS-485 Point-to-Multi-Point / Half-Duplex
3. RS-422 Point-to-Point / Full-Duplex
4. RS-422 Point-to-Multi-Point / Full-Duplex