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Y301-440/444 Technical Manual ​

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

Contents ​

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

1. Overview ​

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

ModelDIDOAIDescription
Y301-440440Four inputs + four relays
Y301-444444Four inputs + four relays + four analog inputs

Frame format: [slave address][function code][data][CRC low][CRC high]

The examples below use slave address 0x01. Replace it with the actual device address in your application.

2. Default Settings ​

ParameterDefault
Slave address1
Baud rate9600 bps
Data bits8
ParityNone
Stop bits1

3. Modbus Register Map ​

3.1 Digital Input (DI) - Function Code 0x02 ​

ChannelAddressSupported Models
DI10x0000Y301-440, Y301-444
DI20x0001Y301-440, Y301-444
DI30x0002Y301-440, Y301-444
DI40x0003Y301-440, Y301-444

Return value: 0 = inactive, 1 = active.

3.2 Digital Output (DO) - Function Code 0x01/0x05 ​

ChannelAddressSupported Models
DO10x0000Y301-440, Y301-444
DO20x0001Y301-440, Y301-444
DO30x0002Y301-440, Y301-444
DO40x0003Y301-440, Y301-444

Write value: 0x0000 = open, 0xFF00 = closed.

3.3 Analog Input (AI) - Function Code 0x04 (Y301-444 only) ​

ChannelAddressDescription
AI1 voltage0x0000Voltage value in mV
AI1 current0x0001Current value in uA
AI2 voltage0x0002Voltage value in mV
AI2 current0x0003Current value in uA
AI3 voltage0x0004Voltage value in mV
AI3 current0x0005Current value in uA
AI4 voltage0x0006Voltage value in mV
AI4 current0x0007Current value in uA

Each AI channel can be wired for either voltage or current. The other reading is invalid.

3.4 Configuration Registers - Function Code 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 Inputs ​

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 Status ​

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 Outputs ​

OperationCommand
Open DO101 05 00 00 00 00 CD CA
Close DO101 05 00 00 FF 00 8C 3A
Open DO201 05 00 01 00 00 9C 0A
Close DO201 05 00 01 FF 00 DD FA
Open DO301 05 00 02 00 00 6C 0A
Close DO301 05 00 02 FF 00 2D FA
Open DO401 05 00 03 00 00 3D CA
Close DO401 05 00 03 FF 00 7C 3A

4.4 Read Analog Inputs (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
Open DO101 05 00 00 00 00 CD CA
Close DO101 05 00 00 FF 00 8C 3A
Open DO201 05 00 01 00 00 9C 0A
Close DO201 05 00 01 FF 00 DD FA
Open DO301 05 00 02 00 00 6C 0A
Close DO301 05 00 02 FF 00 2D FA
Open DO401 05 00 03 00 00 3D CA
Close DO401 05 00 03 FF 00 7C 3A

5. Parameter Configuration ​

5.1 Change the Slave Address ​

Set the slave address to 5:

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

After the change, subsequent commands must use the new address.

5.2 Change the Baud Rate ​

Common baud-rate values:

Baud RateValue
96000x00002580
192000x00004B00
384000x00009600
1152000x0001C200

Power-cycle the device after changing the baud rate.

5.3 Restore Factory Defaults ​

Hold the Reload button for 3-15 seconds to restore:

  • Slave address -> 1
  • Baud rate -> 9600
  • All parameters -> factory defaults

6. Automation Rules ​

The Y301-440/444 support DI -> DO automation, and the Y301-444 also supports AI threshold triggering. Up to 8 rules are supported, with 2 rules per DO.

6.1 Automation Register Map ​

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

OffsetFieldDescription
+0ModeRule type (see table below)
+1Action0=open, 1=close, 2=toggle
+2DO indexTarget relay, starting from 1
+3Trigger indexSource DI or AI, starting from 1
+4-5Parameter 1Mode-dependent, 32-bit
+6-7Parameter 2Mode-dependent, 32-bit

6.2 Rule Modes ​

ModeNameDescription
0DI followDO follows the DI state
1DI inverseDO is the inverse of the DI state
2PulseDO outputs a pulse for parameter1 ms when DI triggers
3Delayed ONDO closes parameter1 ms after DI closes
4Delayed OFFDO opens parameter1 ms after DI opens
5CycleDO toggles periodically, parameter1=ON time, parameter2=OFF time
9Daily scheduleExecute the action daily at the time specified by parameter1 (seconds since midnight)
10AI thresholdTrigger when AI exceeds parameter1 (Y301-444 only)
13Logic combinationApply AND/OR/XOR logic across multiple DI channels

6.3 Example: DO1 Follows DI1 ​

Configuration:

FieldValue
Mode0x0000 (DI follow)
Action0x0001 (close when DI=1)
DO index0x0001
Trigger index0x0001
Parameter 10x00000000
Parameter 20x00000000

Modbus command:

text
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: Close DO1 Daily at 18:00 ​

Configuration:

FieldValue
Mode0x0009 (daily schedule)
Action0x0001 (close)
DO index0x0001
Trigger index0x0000
Parameter 10x0000FD20 (64800 seconds = 18:00)
Parameter 20x00000000

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

Configuration:

FieldValue
Mode0x000A (AI threshold)
Action0x0001 (close)
DO index0x0001
Trigger index0x0001 (AI1)
Parameter 10x00001388 (5000 mV)
Parameter 20x000003E8 (minimum trigger interval 1000 ms)

7. Troubleshooting ​

SymptomCauseSolution
No responseWrong address or baud rateCheck settings and try broadcast address 0
CRC errorWiring issue or interferenceCheck RS485 polarity and add termination resistors
DO does not switchLoad exceeds ratingReduce the load and verify contact ratings
DI always reads 0Wiring errorCheck COM/DI wiring and input voltage
AI reading is abnormalWrong wiring modeVerify voltage/current wiring; each channel supports only one mode at a time

LED Indicators ​

LEDStatusMeaning
POWERSolid onPower is normal
TXFlashingData is being transmitted
RXFlashingData is being received
DI1-DI4OnInput is active
DO1-DO4OnRelay is closed