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Y301-440/444 Technical Manual ​

Y301-440Y301-444
Y301-440Y301-444

Table of Contents ​

  1. Overview
  2. Default Settings
  3. Modbus Register Map
  4. Command Examples
  5. Configuration
  6. Linkage Rules
  7. Troubleshooting

1. Overview ​

This manual covers Modbus-RTU commands for Y301-440 and Y301-444 I/O modules.

ModelDIDOAIDescription
Y301-440440Quad input + quad relay
Y301-444444Quad input + quad relay + quad analog input

Frame Format: [Slave ID][Function][Data][CRC Lo][CRC Hi]

All examples use slave address 0x01. Replace with your device address.

2. Default Settings ​

ParameterDefault
Slave Address1
Baud Rate9600 bps
Data Bits8
ParityNone
Stop Bits1

3. Modbus Register Map ​

3.1 Digital Inputs (DI) — Function 0x02 ​

ChannelAddressModels
DI10x0000Y301-440, Y301-444
DI20x0001Y301-440, Y301-444
DI30x0002Y301-440, Y301-444
DI40x0003Y301-440, Y301-444

Response: 0 = no signal, 1 = signal present.

3.2 Digital Outputs (DO) — Function 0x01/0x05 ​

ChannelAddressModels
DO10x0000Y301-440, Y301-444
DO20x0001Y301-440, Y301-444
DO30x0002Y301-440, Y301-444
DO40x0003Y301-440, Y301-444

Write value: 0x0000 = open (OFF), 0xFF00 = close (ON).

3.3 Analog Inputs (AI) — Function 0x04 (Y301-444 only) ​

ChannelAddressDescription
AI1 Voltage0x0000Voltage reading (mV)
AI1 Current0x0001Current reading (µA)
AI2 Voltage0x0002Voltage reading (mV)
AI2 Current0x0003Current reading (µA)
AI3 Voltage0x0004Voltage reading (mV)
AI3 Current0x0005Current reading (µA)
AI4 Voltage0x0006Voltage reading (mV)
AI4 Current0x0007Current reading (µA)

Each AI channel accepts either voltage or current input; the other reading is invalid.

3.4 Configuration Registers — Function 0x03/0x06 ​

AddressParameterRangeDefault
0x003ESlave Address1–2551
0x0057Baud Rate600–2304009600
0x0059Data Bits8 or 98
0x005AStop Bits1 or 21
0x005BParity0=none, 1=odd, 2=even0

4. Command Examples ​

4.1 Read Digital Input ​

OperationRequest (hex)
Read DI101 02 00 00 00 01 B9 CA
Read DI201 02 00 01 00 01 E8 0A
Read DI301 02 00 02 00 01 18 0A
Read DI401 02 00 03 00 01 49 CA

4.2 Read Digital Output State ​

OperationRequest (hex)
Read DO101 01 00 00 00 01 FD CA
Read DO201 01 00 01 00 01 AC 0A
Read DO301 01 00 02 00 01 5C 0A
Read DO401 01 00 03 00 01 0D CA

4.3 Control Digital Output ​

ActionCommand
DO1 OFF01 05 00 00 00 00 CD CA
DO1 ON01 05 00 00 FF 00 8C 3A
DO2 OFF01 05 00 01 00 00 9C 0A
DO2 ON01 05 00 01 FF 00 DD FA
DO3 OFF01 05 00 02 00 00 6C 0A
DO3 ON01 05 00 02 FF 00 2D FA
DO4 OFF01 05 00 03 00 00 3D CA
DO4 ON01 05 00 03 FF 00 7C 3A

4.4 Read Analog Input (Y301-444 only) ​

OperationRequest (hex)
Read AI1 Voltage01 04 00 00 00 01 31 CA
Read AI1 Current01 04 00 01 00 01 60 0A
Read AI2 Voltage01 04 00 02 00 01 90 0A
Read AI2 Current01 04 00 03 00 01 C1 CA
Read AI3 Voltage01 04 00 04 00 01 70 0B
Read AI3 Current01 04 00 05 00 01 21 CB
Read AI4 Voltage01 04 00 06 00 01 D1 CB
Read AI4 Current01 04 00 07 00 01 80 0B

4.5 Quick Reference Table ​

OperationRequest (hex)
Read DI101 02 00 00 00 01 B9 CA
Read DI201 02 00 01 00 01 E8 0A
Read DI301 02 00 02 00 01 18 0A
Read DI401 02 00 03 00 01 49 CA
DO1 OFF01 05 00 00 00 00 CD CA
DO1 ON01 05 00 00 FF 00 8C 3A
DO2 OFF01 05 00 01 00 00 9C 0A
DO2 ON01 05 00 01 FF 00 DD FA
DO3 OFF01 05 00 02 00 00 6C 0A
DO3 ON01 05 00 02 FF 00 2D FA
DO4 OFF01 05 00 03 00 00 3D CA
DO4 ON01 05 00 03 FF 00 7C 3A

5. Configuration ​

5.1 Change Slave Address ​

Set slave address to 5:

Request:  01 06 00 3E 00 05 E8 00
Response: 01 06 00 3E 00 05 E8 00

After changing, use the new address for subsequent commands.

5.2 Change Baud Rate ​

Common baud rate values:

Baud RateValue
96000x00002580
192000x00004B00
384000x00009600
1152000x0001C200

Power cycle the device after changing baud rate.

5.3 Factory Reset ​

Hold the Reload button for 3–15 seconds. The device restores:

  • Slave address → 1
  • Baud rate → 9600
  • All parameters → factory defaults

6. Linkage Rules ​

Y301-440/444 support DI→DO linkage. Y301-444 also supports AI threshold triggers. Maximum 8 rules (2 per DO).

6.1 Linkage Register Map ​

Rules start at address 0x0080. Each rule uses 8 registers (16 bytes).

OffsetFieldDescription
+0ModeRule type (see below)
+1Action0=open, 1=close, 2=toggle
+2DO IndexTarget relay (1-based)
+3Trigger IndexSource DI or AI (1-based)
+4–5Param1Mode-specific (32-bit)
+6–7Param2Mode-specific (32-bit)

6.2 Linkage Modes ​

ModeNameDescription
0DI FollowDO mirrors DI state
1DI ReverseDO inverts DI state
2PulseDO pulses for Param1 ms when DI triggers
3Delay OnDO closes Param1 ms after DI closes
4Delay OffDO opens Param1 ms after DI opens
5CycleDO toggles periodically; Param1=ON time, Param2=OFF time
9Daily TimerExecute at Param1 seconds from midnight
10AI ThresholdTrigger when AI exceeds Param1 (Y301-444 only)
13LogicAND/OR/XOR combination of multiple DI

6.3 Example: DO1 Follows DI1 ​

Configuration:

FieldValue
Mode0x0000 (DI Follow)
Action0x0001 (close when DI=1)
DO Index0x0001
Trigger Index0x0001
Param10x00000000
Param20x00000000

Modbus Command:

01 10 00 80 00 08 10 00 00 00 01 00 01 00 01 00 00 00 00 00 00 00 00 0D FE

6.4 Example: DO1 Closes Daily at 18:00 ​

Configuration:

FieldValue
Mode0x0009 (Daily Timer)
Action0x0001 (close)
DO Index0x0001
Trigger Index0x0000
Param10x0000FD20 (64800 seconds = 18:00)
Param20x00000000

6.5 Example: DO1 Closes When AI1 Exceeds 5V (Y301-444 only) ​

Configuration:

FieldValue
Mode0x000A (AI Threshold)
Action0x0001 (close)
DO Index0x0001
Trigger Index0x0001 (AI1)
Param10x00001388 (5000 mV)
Param20x000003E8 (min trigger interval 1000 ms)

7. Troubleshooting ​

SymptomCauseSolution
No responseWrong address or baud rateVerify settings; try broadcast address 0
CRC errorWiring issue or noiseCheck RS485 A/B polarity; add termination
DO not switchingRelay load exceeds ratingReduce load; check contact rating
DI always shows 0Wiring incorrectVerify COM/DI connection; check input voltage
AI reading abnormalWrong wiring modeConfirm voltage/current wiring; use only one per channel

LED Indicators ​

LEDStateMeaning
POWERSteadyPower OK
TXBlinkSending data
RXBlinkReceiving data
DI1–DI4OnInput active
DO1–DO4OnRelay closed