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Y402-41-L LoRa One-to-Four Wireless I/O Module System Datasheet ​

Y402-41-L MasterY402-41-L Slave
Y402-41-L master imageY402-41-L slave image

Contents ​

  1. Overview
  2. Ordering Information
  3. Key Features
  4. Technical Specifications
  5. Interfaces and Indicators
  6. Mechanical and Environmental
  7. Installation and Wiring
  8. Important Notes

1. Overview ​

The Y402-41-L is a one-to-many Wireless I/O Module system based on LoRa modulation with a four-to-one channel mapping design. It combines a 4DI/4DO master unit with one or more 1DI/1DO slave units. Each slave uses one independent master channel, so one master can serve up to four one-channel remote points.

Y402-41-L control diagram

Operating Logic ​

  • Master to slave: when master DI1 to DI4 is closed, the DO on the slave assigned to that channel energizes
  • Slave to master: when a slave DI is closed, the corresponding DO1 to DO4 on the master energizes
  • The corresponding master and slave outputs reset when the associated input returns to open
  • Four independent channels provide bidirectional transmission between the master and assigned one-channel slaves

Channel Mapping ​

Master channelAssigned slaveMaster-to-slaveSlave-to-master
Channel 1One 1DI/1DO slaveMaster DI1 -> slave DOSlave DI -> master DO1
Channel 2One 1DI/1DO slaveMaster DI2 -> slave DOSlave DI -> master DO2
Channel 3One 1DI/1DO slaveMaster DI3 -> slave DOSlave DI -> master DO3
Channel 4One 1DI/1DO slaveMaster DI4 -> slave DOSlave DI -> master DO4

2. Ordering Information ​

System Components ​

DeviceModelRoleChannelsDimensions
MasterY402-41-LCentral control unit4DI/4DO88 x 72 x 59 mm
SlaveY402-41-LRemote terminal unit1DI/1DO88 x 37 x 59 mm

System configuration:

  • Basic system: 1 master + 1 slave (factory paired)
  • Expanded system: 1 master + up to 4 slaves, with each slave assigned to one master channel

Model Naming and Package ​

Model Naming ​

text
Y402-41-L
  |  |  `-- L: LoRa wireless communication
  |  `---- 41: 4DI/4DO master + 1DI/1DO slave configuration
  `------- Y402: one-to-many Wireless I/O Module system series

Package Contents ​

Qty.Item
1Y402-41-L master module
1Y402-41-L slave module
2470 MHz magnetic-mount antennas
2DIN rail clips
1Quick reference guide
1Warranty card

3. Key Features ​

  1. Four-channel master - Provides 4DI and 4DO for four independent remote channels
  2. One-channel slave - Each slave provides 1DI and 1DO for one remote point
  3. Four-to-one channel mapping - One master channel maps to one assigned one-channel slave
  4. One-to-many architecture - One master supports up to four channel-assigned slave units
  5. Long-range communication - Up to 10 km in open areas as a model-, antenna-, and site-dependent planning value
  6. Bidirectional transmission - Supports master-to-slave and slave-to-master signaling
  7. Wide supply range - 9 to 36V DC with reverse-polarity protection
  8. Relay output - Master: 4 x SPDT relays; slave: 1 x SPDT relay, rated at AC 277V 5A / DC 28V 5A
  9. Dry contact / NPN DI - Supports passive dry contacts and NPN open-collector inputs
  10. Status indication - LEDs for power, link, input, and output status

4. Technical Specifications ​

Wireless ​

ParameterSpecification
Frequency band398 to 525 MHz
Communication rangeUp to 10 km (open area; model, antenna, and site dependent)
Antenna connectorSMA
Standard antenna470 MHz magnetic-mount antenna

Electrical ​

ParameterSpecification
Supply voltage9 to 36V DC
Max. power consumption1.5W (master) / 0.8W (slave)
Master inputs4 x passive dry contact / NPN open-collector (no voltage input to DI)
Master outputs4 x SPDT relay
Slave input1 x passive dry contact / NPN open-collector (no voltage input to DI)
Slave output1 x SPDT relay
Output ratingAC 277V 5A / DC 28V 5A
Operating temperature-20 to +85 degC
Operating humidity10% to 90% RH, non-condensing

5. Interfaces and Indicators ​

Master Interfaces ​

InterfaceDescription
AntennaSMA connector for LoRa antenna
PowerDC 9 to 36V input with reverse-polarity protection
Input4 x passive switch inputs (DI1 to DI4 + COM)
Output4 x relay outputs (NO + COM + NC)

Slave Interfaces ​

InterfaceDescription
AntennaSMA connector for LoRa antenna
PowerDC 9 to 36V input with reverse-polarity protection
Input1 x passive switch input (DI + COM)
Output1 x relay output (NO + COM + NC)

LED Indicators ​

DeviceLEDFunctionStatus
MasterPowerSystem statusOn after power-up
MasterLink 1 to 4Channel link statusOn when the corresponding channel link is established
MasterInput 1 to 4Input statusOn when the corresponding DI is closed
MasterOutput 1 to 4Output statusOn when the corresponding relay is energized
SlavePowerSystem statusOn after power-up
SlaveLinkChannel link statusOn when the wireless link is established
SlaveInputInput statusOn when DI is closed
SlaveOutputOutput statusOn when the relay is energized

6. Mechanical and Environmental ​

Mechanical Specifications ​

ParameterMasterSlave
Dimensions88 x 72 x 59 mm88 x 37 x 59 mm
WeightApprox. 50 gApprox. 50 g
Mounting35 mm DIN rail35 mm DIN rail
Protection ratingIP20IP20
Housing materialFlame-retardant plasticFlame-retardant plastic

7. Installation and Wiring ​

Input Wiring ​

No voltage input on DI

The digital input (DI) is not a voltage-input terminal. It is strictly forbidden to connect any powered signal or voltage source to DI.

Correct wiring: connect only a passive dry contact or an NPN open-collector output between DI and COM. Do not connect sensor power, PLC voltage output, or any external voltage directly to DI.

Mechanical switches (maintained switch, float switch, relay contact):

  • Connect directly between DI and COM
  • No external power supply is required

NPN open-collector output:

  • Output transistor collector -> DI
  • Output transistor emitter / 0V reference -> COM
  • Do not connect sensor power or any voltage output to DI

Output Wiring ​

Direct load (<= 1 kW resistive load):

  • Wire the load in series with the relay output

High-power load (> 1 kW):

  • Use an AC contactor or external power relay

Installation Notes ​

  1. Install the antenna vertically in an open area, about 2 m above ground.
  2. Keep the unit away from large metal structures.
  3. Tighten the antenna connector securely.
  4. Mount the unit inside the control cabinet on a 35 mm DIN rail.
  5. Place the master near the center of the coverage area whenever possible.
  6. Leave enough space for ventilation.

System Expansion ​

To add a new slave unit:

  1. Power on the new one-channel slave.
  2. Pair it with an unused master channel using the pairing button.
  3. Wait for the assigned channel link indicator to remain on before connecting the remote circuit.

8. Important Notes ​

  1. Communication mode - Half-duplex communication, not intended for hard real-time control.
  2. Frequency range - Recommended operating range is 398 to 525 MHz. Performance may degrade outside this range.
  3. Antenna placement - Install the antenna vertically in an open area and keep it away from metal obstructions.
  4. Master/slave topology - Only one master unit is allowed in each system. Use up to four one-channel slave units, with one slave assigned to each master channel.
  5. Four-to-one mapping - Each master DI/DO channel maps bidirectionally to one assigned slave DI/DO channel.
  • Manufacturer: Hunan YenGear Tech Co., Ltd.
  • Address: Room 21014, Building 1, Fudi Xingguang Tiandi, Yingxin Road, Yuhua District, Changsha, Hunan, China
  • Email: [email protected]
  • Website: www.yengear.com