Y301-440/444 Serial I/O Modules Specification

Y301-440	Y301-444

• 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

1. Overview

The Y301-440/444 series provides Modbus RTU serial I/O expansion in two enclosure sizes.

Model	DI	DO	AI	Typical Role
Y301-440	4	4 (SPDT)	-	Multi-zone digital automation
Y301-444	4	4 (SPDT)	4 (0-5 V / 0-10 V / 4-20 mA); default 4-20 mA	Process control with analog sensing

Product Highlights

• Shared Modbus RTU firmware with RS485, RS232, and TTL interface options
• DIN-rail or screw mounting with front-panel status LEDs for power, DI, and DO
• Y301-444 adds four analog inputs in a larger 145 x 90 x 40 mm enclosure
• Y301-440 keeps a compact 115 x 90 x 40 mm footprint for digital-only control

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
Y301-440	4	4	0	0
Y301-444	4	4	4	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 SKU Matrix

SKU	Description
Y301-440	4 DI + 4 DO, digital I/O module
Y301-444	4 DI + 4 DO + 4 AI, digital and analog I/O module

2.4 Package Contents

Module, digital quick reference guide, and warranty card. Optional accessories include a DIN clip, USB-to-RS485 converter, 12/24 VDC power supply, and shielded RS485 wiring kit.

3. Key Features

1. High-power relays - Four SPDT contacts per model, rated at 277 VAC / 10 A or 28 VDC / 10 A
2. Opto-isolated DI - Four dry/wet contact inputs with pulse counting and configurable debounce
3. Analog input on Y301-444 - Four channels supporting 0-5 V, 0-10 V, or 4-20 mA (default), with readings in mV or µA
4. Embedded automation - Up to 8 local rules, including follow, pulse, delay, schedule, logic, and AI threshold modes
5. Retention and addressing - DO retention plus 5-bit DIP offset stacked on the software Modbus address
6. Power and operating environment - 5-36 VDC input, -40 to +85 °C environment, hardware watchdog, Reload button, and communication interfaces

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 (4 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 (4 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	Soft reboot; power-cycle retention requires the corresponding firmware option

4.4 Analog Input (Y301-444, 4 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

The default analog-input version is 4-20 mA. Specify 0-5 V or 0-10 V when ordering.

4.5 Communication

Item	Specification
Interface	RS485 (2-wire), optional RS232 or TTL
Protocol	Modbus RTU slave
Baud rate	600-230400 bps (default 9600)
Slave address	1-255 (software) + DIP offset 0-31

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)
Reload	Hold 3-15 s to restore factory defaults
DI	COM+, COM-, DI1-DI4
DO	NCn / COMn / NOn for channels 1-4
AI (444 only)	Vn+, In+, AIn- for channels 1-4; 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 Y301-444 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	Y301-440	Y301-444
Dimensions	115 x 90 x 40 mm	145 x 90 x 40 mm
Mounting	35 mm DIN clip or screw slots	35 mm DIN clip or screw slots
Protection rating	Not specified	Not specified
Housing material / flame rating	Not specified	Not specified

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

7. Automation Rules

Mode	Description
DI follow	DO mirrors the DI state
Pulse output	Configurable ON/OFF pulse width
Delay control	Programmable ON/OFF delay
Cyclic toggle	Periodic ON/OFF cycling
Timer/schedule	Time-based activation
AI threshold (444)	Triggered by analog input threshold
Logic mode	AND/OR logic combination
Watchdog mode	Automatically resets the DO when the timeout condition occurs

• Up to 8 rules total, with up to 2 rules per DO channel
• Rules run locally without host polling
• When enabled, output retention stores the last automation state

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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