Y301-220/222 Serial I/O Modules Specification

Y301-220	Y301-222

• User Manual
• Technical Manual

Contents

1. Overview
2. Ordering Information
3. Key Features
4. Technical Specifications
5. Interfaces and Pinout
6. Mechanical and Environmental
7. Automation Rules
8. Modbus Address Quick Map

1. Overview

The Y301-220/222 are high-power serial I/O expansion modules that combine opto-isolated digital inputs, 10 A relay outputs, and, on the Y301-222, dual analog inputs for 0-5 V, 0-10 V, or 4-20 mA (default) sensing.

Both models support Modbus RTU over RS485, RS232, or TTL and can be integrated with PLCs, SCADA systems, and industrial gateways.

Model	Digital Input	Digital Output	Analog Input	Typical Role
Y301-220	2	2 x SPDT	-	Equipment monitoring and control
Y301-222	2	2 x SPDT	2 (0-5 V / 0-10 V / 4-20 mA); default 4-20 mA	Process monitoring and control

Analog input is available on the Y301-222 only.

Product Highlights

• 82 x 54 x 32 mm enclosure with DIN-rail and screw mounting options
• 277 VAC / 10 A relay contacts for HVAC, lighting, and pump control
• Local rules on both models; retention and DIP addressing on Y301-222

2. Ordering Information

2.1 Model Configuration

The I/O code follows DI / DO / AI / AO. These are channel counts on one module; the fourth position is omitted on models without AO.

Model	DI	DO	AI	AO
Y301-220	2	2	0	0
Y301-222	2	2	2	0

For the full code and examples, see Model Naming.

2.2 Interface Options

Specify the required interface when ordering:

Interface	Description
RS485	Standard version for Modbus RTU multi-drop networks
RS232	Optional version for point-to-point communication
TTL	Optional on selected models for direct MCU integration

2.3 Ordering Table

SKU	Description
Y301-220	2 DI + 2 DO, high-power relay module
Y301-222	2 DI + 2 DO + 2 AI, combo I/O module

2.4 Standard Package

1 x Y301 module, digital quick reference guide, and warranty card.

Optional accessories include a USB-to-RS485 converter, DIN clip, power supply, and shielded cable set.

3. Key Features

1. High-power relay outputs - 277 VAC / 10 A or 28 VDC / 10 A silver-alloy contacts
2. Opto-isolated DI with pulse counting - Rising/falling edge capture with configurable debounce from 5 to 255 ms
3. Analog input on Y301-222 - Two channels supporting 0-5 V, 0-10 V, or 4-20 mA (default), with readings in mV or µA
4. Automation engine - Up to 4 local rules covering follow, pulse, delay, schedule, cycle, AI threshold, and logic modes
5. Y301-222 retention and addressing - Soft-reboot retention and 5-bit DIP offset; power-cycle retention requires the corresponding firmware option. Y301-220 does not support retention or DIP address offset
6. Power and operating environment - 5-36 VDC input, -40 to +85 °C operation, hardware watchdog, and Reload button

4. Technical Specifications

4.1 Electrical and Environmental

Parameter	Specification
Supply voltage	5-36 VDC
Supply current	Not specified for the ordered hardware
Operating temperature	-40 to +85 °C
Humidity	5-95% RH, non-condensing
Altitude rating	Not specified

4.2 Digital Input (2 channels)

Item	Specification
Type	Dry/wet contact, opto-isolated
Wet-contact voltage range	Obtain the limits for the supplied hardware
DI input current	Not specified
Sampling rate	100 Hz
Pulse counter	32-bit, selectable rising/falling edge
Debounce	5-255 ms (default 50 ms)

The DI sampling rate does not specify a maximum countable pulse frequency. Pulse counting also depends on debounce and pulse timing.

4.3 Digital Output (2 x SPDT relays)

Item	Specification
Contact rating	277 VAC 10 A / 28 VDC 10 A
Minimum switching load	Not specified
Relay switching time	Not specified
Electrical life	100k cycles at rated load
Output retention	Y301-220: unsupported; Y301-222: soft reboot, with optional power-cycle retention

4.4 Analog Input (Y301-222, 2 channels)

Item	Specification
Input type	0-5 V, 0-10 V, or 4-20 mA (default), selected when ordering; use the hardware-specific terminal drawing

4.5 Communication

Item	Specification
Interface	RS485 (2-wire), optional RS232 or TTL
Protocol	Modbus RTU slave
Supported function codes	0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x0F, 0x10
Baud rate	600-230400 bps (default 9600)
Addressing	Y301-220: software address; Y301-222: software address + DIP offset 0-31
Frame format	[slave][function][data][CRC low][CRC high]

4.6 Factory Defaults

Parameter	Default
Device address	1
Baud rate	9600
Data bits / Stop bits / Parity	8 / 1 / None
Output retention	Y301-220: unsupported; Y301-222: read 0x0040 and select the required supported mode
Pulse count mode	Rising edge (0x0041 = 1)
Pulse debounce	50 ms (0x0042 = 50)

5. Interfaces and Pinout

5.1 Terminal Overview

Group	Description
Power	V+, V- screw terminals + DC 5.5 x 2.1 mm jack
DIP switch	SW1-SW5 (binary address offset), Y301-222 only
Reload	Hold 3-15 s to restore factory defaults
DI	COM+, COM-, DI1-DI2
DO	NCn / COMn / NOn for channels 1-2
AI (222 only)	Vn+, In+, AIn- for channels 1-2; use the ordered input version's drawing
Communication	A/B/GND (RS485) or TX/RX/GND (RS232/TTL)

5.2 Wiring Guidelines

• Size the supply wiring and upstream fuse for module consumption and cable capacity.
• Wire DI and COM/COM- according to the supplied model's input drawing. COM+ provides supply positive.
• Check the permitted wet-contact signal voltage before connecting an active source. See the User Manual for common-terminal arrangements.
• For relay outputs driving inductive loads, add an RC snubber for AC loads or a flyback diode for DC loads.
• For Y301-222 analog input wiring, connect the source directly in voltage mode and use the current loop terminals in current mode.
• For RS485, use shielded twisted pair, terminate both ends with 120 ohm resistors, and keep a common reference ground.

6. Mechanical and Environmental

Item	Value
Dimensions	82 x 54 x 32 mm
Mounting	35 mm DIN clip or screw slots
Protection rating	Not specified
Housing material / flame rating	Not specified

Allow access to terminals, the Reload button, and the DIN-rail clip when planning installation clearances.

7. Automation Rules

Mode Group	Description
Follow	DI follow, DI inverse, delayed follow
Pulse / Delay	Pulse output, delayed control
Time-based	One-shot schedule, cyclic schedule, daily schedule, startup delay action
AI threshold (222)	AI voltage high/low, AI current high/low
Logic	AND / OR / XOR
Others	Button mode, periodic cycle

• Up to 4 rules total (2 rules per DO channel)
• Rule register base is 0x0080, each rule occupies 8 registers (16 bytes)
• Rules execute locally without host polling
• If multiple rules conflict, later rules take priority

8. Modbus Address Quick Map

This section uses Modbus addresses only (0xXXXX), not PLC addresses.

8.1 DI / DO / AI

Type	Channel	Modbus Address	Access
DI	DI1	0x0000	RO
DI	DI2	0x0001	RO
DO	DO1	0x0000	RW
DO	DO2	0x0001	RW
AI (222)	AI1 voltage	0x0000	RO
AI (222)	AI1 current	0x0001	RO
AI (222)	AI2 voltage	0x0002	RO
AI (222)	AI2 current	0x0003	RO

8.2 Key Holding Registers

Address	Name	Access	Notes
0x002A	Running slave address	RO	Device address + DIP offset
0x002B	DIP offset address	RO	0-31 on Y301-222; no DIP offset on Y301-220
0x003E	Device address	RW	1-255
0x003F	Broadcast mode	RW	0/1/2
0x0040	Output retention mode	RW	Y301-222 only; available modes depend on firmware
0x0041	Pulse count edge mode	RW	0=falling, 1=rising
0x0042	Pulse debounce (ms)	RW	5-255
0x0055	RTC time (Unix)	RW	32-bit
0x0057	Baud rate	RW	32-bit
0x0059	Data bits	RW	8/9
0x005A	Stop bits	RW	1/2
0x005B	Parity	RW	0=None, 1=Odd, 2=Even

8.3 Counters, Rule Blocks, and Special Register

Address	Name	Notes
0x0500	DI1 counter	32-bit, write 0 to clear
0x0502	DI2 counter	32-bit, write 0 to clear
0x0080	Rule block 1	8 registers per rule
0x0088	Rule block 2	8 registers per rule
0x0090	Rule block 3	8 registers per rule
0x0098	Rule block 4	8 registers per rule
0x0800	Special register	0x5500 reboot, 0x0055/0x5555 factory reset + reboot

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• 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