Y301-220/222 Technical Manual

Y301-220	Y301-222

• Specification Sheet

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Table of Contents

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

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1. Overview

This manual covers Modbus-RTU commands for Y301-220 and Y301-222 I/O modules.

Model	DI	DO	AI	Description
Y301-220	2	2	0	Dual input + dual relay
Y301-222	2	2	2	Dual input + dual relay + dual analog input

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

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

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2. Default Settings

Parameter	Default
Slave Address	1
Baud Rate	9600 bps
Data Bits	8
Parity	None
Stop Bits	1

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3. Modbus Register Map

3.1 Digital Inputs (DI) — Function 0x02

Channel	Address	Models
DI1	0x0000	Y301-220, Y301-222
DI2	0x0001	Y301-220, Y301-222

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

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

Channel	Address	Models
DO1	0x0000	Y301-220, Y301-222
DO2	0x0001	Y301-220, Y301-222

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

3.3 Analog Inputs (AI) — Function 0x04 (Y301-222 only)

Channel	Address	Description
AI1 Voltage	0x0000	Voltage reading (mV)
AI1 Current	0x0001	Current reading (µA)
AI2 Voltage	0x0002	Voltage reading (mV)
AI2 Current	0x0003	Current reading (µA)

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

3.4 Configuration Registers — Function 0x03/0x06

Address	Parameter	Range	Default
0x003E	Slave Address	1–255	1
0x0057	Baud Rate	600–230400	9600
0x0059	Data Bits	8 or 9	8
0x005A	Stop Bits	1 or 2	1
0x005B	Parity	0=none, 1=odd, 2=even	0

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4. Command Examples

4.1 Read Digital Input

Read DI1:

Request:  01 02 00 00 00 01 B9 CA
Response: 01 02 01 [status] [CRC]

Read DI2:

Request:  01 02 00 01 00 01 E8 0A

4.2 Read Digital Output State

Read DO1:

Request:  01 01 00 00 00 01 FD CA
Response: 01 01 01 [status] [CRC]

Read DO2:

Request:  01 01 00 01 00 01 AC 0A

4.3 Control Digital Output

Action	Command
DO1 OFF	01 05 00 00 00 00 CD CA
DO1 ON	01 05 00 00 FF 00 8C 3A
DO2 OFF	01 05 00 01 00 00 9C 0A
DO2 ON	01 05 00 01 FF 00 DD FA

4.4 Read Analog Input (Y301-222 only)

Read AI1 Voltage:

Request:  01 04 00 00 00 01 31 CA
Response: 01 04 02 [high byte] [low byte] [CRC]

Read AI1 Current:

Request:  01 04 00 01 00 01 60 0A

Read AI2 Voltage:

Request:  01 04 00 02 00 01 90 0A

Read AI2 Current:

Request:  01 04 00 03 00 01 C1 CA

4.5 Quick Reference Table

Operation	Request (hex)
Read DI1	01 02 00 00 00 01 B9 CA
Read DI2	01 02 00 01 00 01 E8 0A
Read DO1	01 01 00 00 00 01 FD CA
Read DO2	01 01 00 01 00 01 AC 0A
DO1 OFF	01 05 00 00 00 00 CD CA
DO1 ON	01 05 00 00 FF 00 8C 3A
DO2 OFF	01 05 00 01 00 00 9C 0A
DO2 ON	01 05 00 01 FF 00 DD FA
Read AI1 Voltage	01 04 00 00 00 01 31 CA
Read AI1 Current	01 04 00 01 00 01 60 0A
Read AI2 Voltage	01 04 00 02 00 01 90 0A
Read AI2 Current	01 04 00 03 00 01 C1 CA

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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 Rate	Value
9600	0x00002580
19200	0x00004B00
38400	0x00009600
115200	0x0001C200

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

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6. Linkage Rules

Y301-220/222 support DI→DO linkage. Y301-222 also supports AI threshold triggers.

6.1 Linkage Register Map

Rules start at address 0x0080. Each rule uses 8 registers (16 bytes). Maximum 4 rules (2 per DO).

Offset	Field	Description
+0	Mode	Rule type (see below)
+1	Action	0=open, 1=close, 2=toggle
+2	DO Index	Target relay (1-based)
+3	Trigger Index	Source DI or AI (1-based)
+4–5	Param1	Mode-specific (32-bit)
+6–7	Param2	Mode-specific (32-bit)

6.2 Linkage Modes

Mode	Name	Description
0	DI Follow	DO mirrors DI state
1	DI Reverse	DO inverts DI state
2	Pulse	DO pulses for Param1 ms when DI triggers
3	Delay On	DO closes Param1 ms after DI closes
4	Delay Off	DO opens Param1 ms after DI opens
5	Cycle	DO toggles periodically; Param1=ON time, Param2=OFF time
10	AI Threshold	Trigger when AI exceeds Param1 (Y301-222 only)

6.3 Example: DO1 Follows DI1

Configuration:

Field	Value
Mode	0x0000 (DI Follow)
Action	0x0001 (close when DI=1)
DO Index	0x0001
Trigger Index	0x0001
Param1	0x00000000
Param2	0x00000000

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 When AI1 Exceeds 5V (Y301-222 only)

Configuration:

Field	Value
Mode	0x000A (AI Threshold)
Action	0x0001 (close)
DO Index	0x0001
Trigger Index	0x0001 (AI1)
Param1	0x00001388 (5000 mV)
Param2	0x000003E8 (min trigger interval 1000 ms)

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7. Troubleshooting

Symptom	Cause	Solution
No response	Wrong address or baud rate	Verify settings; try broadcast address 0
CRC error	Wiring issue or noise	Check RS485 A/B polarity; add termination
DO not switching	Relay load exceeds rating	Reduce load; check contact rating
DI always shows 0	Wiring incorrect	Verify COM/DI connection; check input voltage
AI reading abnormal	Wrong wiring mode	Confirm voltage/current wiring; use only one per channel

LED Indicators

LED	State	Meaning
POWER	Steady	Power OK
TX	Blink	Sending data
RX	Blink	Receiving data
DI1/DI2	On	Input active
DO1/DO2	On	Relay closed

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• Manufacturer: Hunan Yanji Tech Co.,Ltd
• Email: hi@yengear.com
• Website: www.yengear.com