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Y503-2220-L LoRaWAN RTU Specification
User Manual: Y503-2220-L User Manual
Contents
- Overview
- Model and Signal Configuration
- Key Features
- Technical Specifications
- Interfaces and Indicators
- Mechanical and Package Information
- Deployment and Ordering
1. Overview
Y503-2220-L connects digital signals, analog sensors, and RS485 equipment to a LoRaWAN network. It provides two digital inputs, two switched voltage outputs, and two analog inputs: one 0–10 V input and one 4–20 mA input.
The RTU sends data through a LoRaWAN gateway to a local or remote Network Server and application. It supports OTAA or ABP activation and Class A or Class C operation.
| Item | Specification |
|---|---|
| Product type | Industrial LoRaWAN remote terminal unit (RTU) |
| Signal configuration | 2 DI + 2 DO + 2 analog inputs; no analog output |
| Analog input allocation | 1 × AV: 0–10 V; 1 × AI: 4–20 mA |
| Serial interface | 1 isolated RS485 |
| LoRaWAN version | 1.0.3 |
| Activation / device class | OTAA or ABP / Class A or Class C |
| Regional plans | EU433, CN470, EU868, AU915, US915, AS923 |
| Reference deployment plan | CN470; select the hardware variant before ordering |
2. Model and Signal Configuration
The four digits in Y503-2220-L represent DI / DO / AI / AO channel counts: 2 / 2 / 2 / 0. The third digit counts the dedicated AV and AI inputs together; the final 0 indicates no analog output.
| Signal | Quantity | Function |
|---|---|---|
| DI1, DI2 | 2 | Dry-contact or powered digital input, up to DC 28 V |
| DO1, DO2 | 2 | Switched voltage outputs; on-state voltage follows the RTU supply |
| AV | 1 | 0–10 V measurement |
| AI | 1 | 4–20 mA measurement |
| AO | 0 | No analog output |
AV and AI are separate, fixed-function terminals. The product does not provide two selectable voltage/current inputs. DO1 and DO2 supply switched voltage; they are not voltage-free relay contacts or analog outputs.
3. Key Features
- Reports digital states, voltage, current, and RS485 data through LoRaWAN.
- Supports periodic acquisition, heartbeat reporting, and input/output state-change reporting.
- Supports RS485 polling tasks and transparent serial transport, including Modbus RTU data.
- Supports remote output commands, timed control, and pulse output on compatible firmware.
- Supports local input-to-output rules and remote parameter configuration on compatible firmware.
- Provides isolated RS485 with built-in 15 kV ESD protection.
Confirm the configuration tool, payload definition, and control behavior for the delivered firmware before enabling timed, pulse, or local-rule functions.
4. Technical Specifications
4.1 LoRaWAN Radio
| Parameter | Specification |
|---|---|
| Protocol | LoRaWAN 1.0.3 |
| Activation | OTAA / ABP |
| Device classes | Class A / Class C |
| Frequency plans | EU433, CN470, EU868, AU915, US915, AS923 |
| Transmit power | -1 to 22 dBm, subject to the regional configuration |
| Bandwidth | 125 kHz |
| Spreading factor | SF7–SF12 |
| Nominal radio data rates | Approximately 5.5 / 3.1 / 1.8 / 1.0 / 0.6 / 0.3 kbps |
| Receiver sensitivity | -135 dBm at SF12, 125 kHz bandwidth |
Specify the AS923 sub-plan when ordering. Nominal radio data rate is not application throughput; airtime, payload size, reporting interval, retries, and regional limits determine usable capacity.
4.2 Digital Inputs and Outputs
| Parameter | Specification |
|---|---|
| DI count | 2, with a shared COM terminal |
| DI signal types | Dry contact and powered contact; NPN/PNP wiring depends on the COM connection |
| Maximum DI voltage | DC 28 V |
| DO count | 2 switched voltage outputs |
| DO on-state voltage | Follows the applied RTU supply voltage |
| DO current limit | 1 A stated maximum; confirm the per-channel and combined limit for the intended load |
| Adapter requirement | Use a 2 A adapter when the connected output load exceeds 200 mA |
The available rating does not establish that both outputs can supply 1 A simultaneously. Size the supply for the RTU and combined load, including starting current. Use an interposing device where the load exceeds the confirmed output rating, and suppress inductive transients.
4.3 Analog Inputs
| Parameter | AV terminal | AI terminal |
|---|---|---|
| Channel count | 1 | 1 |
| Input range | 0–10 V | 4–20 mA |
| Stated maximum input | 10.7 V | 22 mA |
| Accuracy | ±0.5% of full scale | ±0.5% of full scale |
| Resolution | 0.001 V | 0.001 mA |
Use each terminal only for its specified signal. The stated maximum is not a normal operating target. Resolution describes the reported step size, not measurement accuracy.
4.4 RS485
| Parameter | Specification |
|---|---|
| Interface | 1 isolated RS485, A/B |
| ESD protection | 15 kV |
| Baud rates | 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps |
| Data / stop bits | 8 / 1 or 2 |
| Parity | None, odd, or even |
| Initial serial setting | 9600 bps, 8 data bits, no parity, 1 stop bit |
| Operation | Scheduled polling and transparent transport, as configured |
Match the equipment's serial settings, protocol, address, and command format. Application decoding requires the correct payload definition and register map.
4.5 Power and Environment
| Parameter | Specification |
|---|---|
| Supply | DC 9–28 V |
| Reference adapter | DC 12 V / 1 A; use a larger supply where required by the output load |
| Stated maximum working current | 0.5 A for the RTU; budget controlled loads separately |
| Stated average power | ≤0.5 W; load and operating conditions affect total consumption |
| Operating temperature | -40 to 85 °C |
| Storage temperature | -50 to 95 °C |
| Humidity | 5–95% RH, non-condensing |
5. Interfaces and Indicators
| Label | Connection or function |
|---|---|
| ANT | SMA female LoRa antenna connector |
| USB | Debug/log interface; follow the delivered service procedure |
| RELOAD | Short press: restart; hold for 5 s: restore factory settings |
| PE | Enclosure earth connection |
| AV, GND | Voltage input and reference |
| AI, GND | Current input and reference |
| DO2, DO1, GND | Switched voltage outputs and return |
| DI2, DI1, COM | Digital inputs and their common terminal |
| A, B | RS485 |
| −, + and DC jack | Parallel DC power inputs; use one supply |
| Indicator | Meaning |
|---|---|
| POWER | Steady: normal power; off: no power or a power fault |
| RUN | Blinking: normal operation; steady or off: check startup/fault status |
| LoRa | Radio transmission activity |
| DI1 / DI2 | Detected input state |
| DO1 / DO2 | Output voltage state |
| RS485 | Serial receive activity |
The indicator state does not confirm that an application received data or a connected load operated. Verify the complete data or control path.
6. Mechanical and Package Information
| Parameter | Specification |
|---|---|
| Enclosure dimensions | 104 × 97.6 × 25.6 mm |
| Stated weight | Approximately 0.7 kg |
| Installation | Wall or panel surface; follow the supplied mounting drawing |
| Reference package | RTU, DC 12 V / 1 A adapter, LoRa antenna, and mounting screws |
Check the order packing list for the supplied adapter, antenna, and mounting accessories.
7. Deployment and Ordering
Field signals / RS485 equipment → Y503-2220-L → LoRaWAN gateway → Network Server → Application
A Y501-L or Y511-L gateway can provide the radio path when its regional plan and channels match the RTU. The Network Server can run remotely or on a gateway with the ordered local NS/AS option. It manages activation, sessions, and downlink scheduling; the application decodes measurements and creates commands.
Before ordering, specify:
- Regional plan, channel group, and AS923 sub-plan where applicable.
- Class A or Class C operation and the required reporting interval.
- DI sensor type and COM wiring; DO load voltage, current, and starting current.
- One voltage-input sensor and/or one current-input sensor.
- RS485 protocol, baud rate, device addresses, and polling commands.
- Firmware, configuration tool, uplink decoder, downlink command definition, and output behavior after startup or communication loss.
LoRaWAN downlinks have timing and capacity limits. Verify response time and output state with the actual installation before enabling unattended control.
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