Y301 MiniLink Series Serial I/O Modules User Manual

Applicable models: Y301-110, Y301-200, Y301-020.

• Specification | Technical Manual

Product Overview

MiniLink modules acquire switch states and control relay contacts over Modbus RTU. The three models provide one or two digital I/O channels.

Key features:

• RS485 standard; RS232 and TTL available on selected models
• 5-36 VDC power supply
• Dry and wet contact DI support
• Relay outputs for valves, lights, alarms, and actuators
• DIN-rail or screw mounting

Model Naming

The positions after Y301- represent DI / DO / AI / AO channel counts on one module. 0 means no channels of that type. Models without AO use three characters for DI, DO, and AI; models with AO retain the fourth position.

Code	Channel count
0–9	0–9
A	10
G	16
W	32

Interface options are specified separately from the I/O code; use the configuration table in the relevant specification.

For example, Y301-110 has 1 DI and 1 DO; Y301-200 has 2 DI only; Y301-020 has 2 DO only. All three models have no AI or AO.

Model Selection

Product	Model	DI	DO	Recommended Use
	Y301-110	1	1	One switch input + one device control
	Y301-200	2	0	Two-channel status acquisition
	Y301-020	0	2	Two-channel relay control

Default Parameters

Parameter	Default Value
Communication protocol	Modbus RTU
Device address	1
Baud rate	9600 bps
Data bits	8
Stop bits	1
Parity	None
Power supply	5-36 VDC

Note: Each RS485 device must have a unique address. Changes to address or baud rate require a restart. If communication fails, verify address, baud rate, A/B polarity, and GND connection.

Hardware Interfaces

Interface Area	Y301-110	Y301-200	Y301-020
Power	+, -	+, -	+, -
Communication	A, B, GND	A, B, GND	A, B, GND
DI Input	DI, DI-COM	DI1, DI1-COM, DI2, DI2-COM	None
DO Output	COM1, NO1, NC1	None	COM1~COM2, NO1~NO2, NC1~NC2
Reload Button	Reload / Reset	Reload / Reset	Reload / Reset

DO terminal definitions:

• COM: Common
• NO: Normally open (closes when relay on)
• NC: Normally closed (opens when relay on)

Wiring precautions:

• Power off before wiring
• Use shielded twisted pair for RS485; add 120Ω termination at both ends of long runs
• Add flyback diodes, RC snubbers, or surge protection for inductive loads
• Relay rating: 125 VAC / 0.5 A or 30 VDC / 2 A

DI Wiring

Y301-110 has one input pair (DI, DI-COM). Y301-200 has separate input pairs (DI1, DI1-COM and DI2, DI2-COM). Use the labels on the supplied module.

Y301-200 Dry Contact Input

Connection	DI1	DI2
Supply negative	DI1-COM	DI2-COM
Supply positive through the external contact	DI1	DI2

Disconnect power before wiring. Each external contact switches the supply-positive connection to its DI terminal. Use the Y301-110 wiring drawing for its single input pair.

Wet Contact Input

Wire the signal positive to the selected DI and its negative reference to the corresponding DI-COM. The permitted wet-contact signal voltage is not specified in this manual; obtain the input limits for the supplied hardware before connecting an active source. The 5-36 VDC module supply range does not establish the DI signal range.

DO Wiring Diagram

Applicable models: Y301-110, Y301-020.

DO channels provide relay contact outputs for valves, lights, alarms, and small actuator circuits.

Standard Load

Wiring notes:

• Relay contacts do not output voltage; external load power is required
• Standard wiring: route load power line through COM and NO
• Use COM and NC for normally-on applications
• For AC high-voltage loads, use qualified personnel and proper insulation / fuses

Common Applications

Application	Recommended Model	Description
Door sensor, button, or level switch monitoring	Y301-200	Two digital inputs
Alarm light, buzzer, or valve control	Y301-020	Two relay outputs
Equipment status and remote start/stop	Y301-110	One input and one output

---

• Manufacturer: Hunan YenGear Tech Co., Ltd.
• Email: [email protected]
• Website: www.yengear.com