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Y502-L LoRaWAN Serial DTU Specification
User Manual: Y502-L User Manual
Product type: Industrial LoRaWAN data transmission unit (DTU)
Contents
- Overview
- Model Configuration
- Key Features
- Technical Specifications
- Interfaces and Indicators
- Mechanical, Environmental, and Package
- Gateway Compatibility and Deployment
- Ordering Notes
1. Overview
Y502-L connects PLCs, meters, data loggers, and serial sensors to LoRaWAN through one isolated RS485 port and one isolated RS232 port.
The DTU forwards serial bytes, polls equipment at scheduled intervals, reports data changes, and sends remote commands. Polling tasks accept Modbus RTU or custom frames entered as ASCII text or hexadecimal bytes.
Use a Y501-L or Y511-L gateway with the same regional frequency plan and compatible channel settings.
| Item | Specification |
|---|---|
| Product type | Industrial LoRaWAN serial DTU |
| Serial interfaces | 1 isolated RS485 + 1 isolated RS232 |
| Direct I/O | None |
| LoRaWAN activation | OTAA / ABP |
| Device classes | Class A / Class C |
| LoRaWAN version | 1.0.3 |
| Reference deployment plan | CN470 |
| Supported regional plans | CN470, EU433, EU868, AU915, IN865, AS923, RU864, US915 |
| Gateway compatibility | Y501-L and Y511-L with a matching regional plan |
2. Model Configuration
2.1 Model Code
The -L suffix identifies the LoRaWAN variant.
| Model | RS485 | RS232 | DI | DO | AI | AO |
|---|---|---|---|---|---|---|
| Y502-L | 1 | 1 | 0 | 0 | 0 | 0 |
Measurements and control functions come from the connected serial equipment and its protocol.
2.2 Product Positioning
| Product | Primary function | Direct signal channels |
|---|---|---|
| Y502-L | Wireless connection for serial equipment | None |
| Y503-2220-L | Distributed signal acquisition and remote control | 2 DI + 2 DO + 2 AI |
For direct signal wiring, see the Y503-2220-L I/O specification.
3. Key Features
- Transparent serial transport for equipment that sends data or responds to application commands.
- Scheduled polling with configurable commands, intervals, and uplink ports.
- Data-change reporting based on consecutive acquisition results.
- Heartbeat reporting at a configurable interval.
- Local serial configuration and firmware-supported remote parameter, read, and control commands.
4. Technical Specifications
4.1 LoRaWAN Radio
| Parameter | Specification |
|---|---|
| Wireless protocol | LoRaWAN |
| LoRaWAN version | 1.0.3 |
| Activation | OTAA / ABP |
| Device classes | Class A / Class C |
| Frequency plans | CN470, EU433, EU868, AU915, IN865, AS923, RU864, US915 |
| Transmit power | -1 to 22 dBm, configurable |
| Maximum RF input level | <10 dBm |
| Bandwidth | Fixed 125 kHz |
| Spreading factor | SF7 to SF12, configurable |
| Nominal data rates | Approximately 5.5, 3.1, 1.8, 1.0, 0.6, and 0.3 kbps |
| Receiver sensitivity | -135 dBm @ SF12, BW125 kHz |
| Harmonics | < -40 dBm @ 1 GHz |
Set the channel group and transmit power within the hardware variant's regional limits. Spreading factor, payload size, reporting interval, acknowledgements, and radio limits determine application throughput.
4.2 RS232
| Parameter | Specification |
|---|---|
| Interface | Isolated 3-wire RS232: TXD, RXD, GND |
| ESD protection | 15 kV |
| Data bits | 8 |
| Stop bits | 1 or 2 |
| Parity | None, odd, or even |
| Baud rates | 2400, 4800, 9600, 19200, 38400, 57600, or 115200 bps |
| Factory communication default | 115200 bps, 8 data bits, 1 stop bit, no parity |
4.3 RS485
| Parameter | Specification |
|---|---|
| Interface | Isolated RS485: A+, B- |
| ESD protection | 15 kV |
| Data bits | 8 |
| Stop bits | 1 or 2 |
| Parity | None, odd, or even |
| Baud rates | 2400, 4800, 9600, 19200, 38400, 57600, or 115200 bps |
| Factory communication default | 9600 bps, 8 data bits, 1 stop bit, no parity |
Match serial parameters with the field device. Use its protocol, device address, and register map to set polling commands and payload decoding.
4.4 Electrical
| Parameter | Specification |
|---|---|
| Supply voltage | DC 9–28 V |
| Recommended supply | DC 12 V / 1 A |
| Maximum current | 0.5 A at DC 12 V supply |
| Average power consumption | ≤0.5 W in low-duty-cycle operation |
4.5 Configuration and Data Acquisition
| Parameter | Specification |
|---|---|
| Operation modes | Transparent transmission and active acquisition |
| Acquisition tasks | Up to 16 configurable scripts, plus a heartbeat task |
| Command entry formats | HEX or ASCII |
| Maximum script length | 40 bytes |
| Script interval | 10–86,400 s |
| Remote functions | Parameter settings, read commands, control commands, and firmware-supported configuration commands |
Use the firmware's command and payload definitions. Record task commands, intervals, ports, and decoding rules during commissioning.
5. Interfaces and Indicators
5.1 Interface Description
| Interface | Description |
|---|---|
| Power input | DC 9–28 V |
| Factory reset button | Short press: reset; double-click: enter configuration mode; hold for 5 s: restore factory settings |
| LoRa antenna | SMA female connector |
| RS485 | A+, B- |
| RS232 | TXD, RXD, GND |
5.2 LED Indicators
| Indicator | Function |
|---|---|
| POWER | On when power is normal; off when power is absent or abnormal |
| RUN | Blinks during normal operation; steady or off when the system is abnormal |
| LoRa TX | Briefly lights or blinks during LoRa transmission |
| RS232 RX | Blinks when RS232 data is received |
| RS485 RX | Blinks when RS485 data is received |
6. Mechanical, Environmental, and Package
6.1 Mechanical and Environmental
| Parameter | Specification |
|---|---|
| Mounting | 35 mm DIN rail |
| Dimensions | 87.65 × 36.54 × 59.3 mm |
| Weight | Approximately 0.5 kg |
| Operating temperature | -40 to 85 °C |
| Storage temperature | -50 to 95 °C |
| Humidity | 0–95% RH, non-condensing |
6.2 Standard Package
| Item | Quantity |
|---|---|
| Y502-L DTU | 1 |
| DC 12 V / 1 A power adapter | 1 |
| LoRa antenna | 1 |
Check the packing list for the supplied adapter and antenna.
7. Gateway Compatibility and Deployment
7.1 Recommended Network Topology
Serial field device → Y502-L → LoRaWAN → Y501-L or Y511-L → Network Server or local service → Application
Transparent mode carries serial bytes in LoRaWAN packets. Packet size, airtime, and downlink scheduling limit throughput and response time. Test the longest message and set request timeouts for the complete wireless path.
7.2 Regional Plan Matching
Choose a hardware variant from the frequency plans supported by Y502-L; CN470 is the reference deployment plan. Match the DTU, gateway, and Network Server channel group. For AS923, specify the sub-plan.
7.3 Data and Control Direction
| Direction | Typical data |
|---|---|
| Uplink | Serial data, heartbeat, device status, and acquisition results |
| Downlink | Serial commands, read commands, control commands, and firmware-supported configuration commands |
Use the payload format, FPort, scaling, and acknowledgement rules for the installed firmware.
8. Ordering Notes
- Specify the regional hardware variant and Class A or Class C operation.
- Identify the field interface: RS485 or RS232.
- Supply the serial protocol, baud rate, device address, register map, polling interval, and payload format.
- Use firmware and configuration profiles supplied for the exact hardware variant.
YenGear
Hunan YenGear Tech Co., Ltd.
Room 21014, Building 1, Fudi Xingguang Tiandi, Yingxin Road, Yuhua District, Changsha, Hunan, China
[email protected] · www.yengear.com