Y503-2220-L LoRaWAN RTU Specification

User Manual: Y503-2220-L User Manual

Contents

1. Overview
2. Model and Signal Configuration
3. Key Features
4. Technical Specifications
5. Interfaces and Indicators
6. Mechanical and Package Information
7. 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 measurements through a LoRaWAN gateway and Network Server to an application. Downlink commands control the outputs and supported serial functions.

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 measures voltage and AI measures current; neither terminal switches between signal types. DO1 and DO2 switch the supply voltage to a load. Equipment that needs a voltage-free contact requires an external relay or suitable interface.

3. Key Features

• Periodic acquisition, heartbeat reporting, and input/output state-change reporting.
• RS485 polling and transparent serial transport, including Modbus RTU frames.
• Remote output commands, timed control, and pulse output on compatible firmware.
• Local input-to-output rules and remote parameter configuration on compatible firmware.

Use the installed firmware's configuration tool and command definitions to set timed, pulse, and local-rule behavior.

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. Airtime, payload size, reporting interval, retries, and regional limits reduce usable throughput below the nominal radio data rate.

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

Check the per-channel and combined output limits before sizing the load; the stated rating does not specify two simultaneous 1 A outputs. Size the supply for the RTU, combined load, and starting current. Use a relay or driver for loads above the confirmed rating, with transient suppression for inductive loads.

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

Operate AV within 0–10 V and AI within 4–20 mA. The stated maxima are input limits, rather than measurement targets. Resolution is the reported step size.

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 serial settings, protocol, address, and command format with the equipment. Decode its responses using the firmware's payload definition and the equipment's 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

Check data reception in the application and output operation at the load; LEDs show local device activity.

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 provides the radio path with a matching frequency plan and channel group. The Network Server manages activation, sessions, and downlink scheduling. It runs remotely or on a gateway with optional local Network Server (NS) and Application Server (AS) software. The application decodes measurements and creates commands.

Specify the deployment settings when ordering:

• 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.

Downlink timing depends on device class, server scheduling, and radio capacity. Test command response time and load operation at the installation before enabling unattended control.

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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