Serial Gateway

Serial to 4G / WiFi / Ethernet / LoRa Gateway

The Y201, Y202, Y204 and Y208 Serial Gateway families connect RS232, RS485 or TTL devices to 4G LTE, Wi-Fi, Ethernet or LoRa networks. Models provide 1, 2, 4 or 8 serial ports and support transparent TCP/UDP, Modbus RTU-to-TCP and MQTT/HTTP data transmission.

Support RS232 / RS485 / TTL
Supports Modbus TCP / RTU
Support TCP / UDP / MQTT / HTTP

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Model Comparison

Model	Uplink	Serial Ports	Interfaces	Typical Use
Y201-G	4G LTE Cat1	1 (Mini DTU)	RS485 / RS232 / TTL	Single device backhaul where only cellular is available
Y201-W	WiFi	1 (Mini DTU)	RS485 / RS232 / TTL	Indoor panels with stable WLAN and no Ethernet cable run
Y201-R	Ethernet	1 (Mini DTU)	RS485 / RS232 / TTL	Wired cabinets requiring stable connectivity and low latency
Y201-L	LoRa	1 (Mini DTU)	RS485 / RS232 / TTL	Remote assets 5–10 km away, paired with LoRa gateway
Y202-W	WiFi	2 (Standard DTU)	RS232+RS485 / 2×RS232 / 2×RS485	Two instruments aggregated over WLAN in one uplink
Y202-R	Ethernet	2 (Standard DTU)	RS232+RS485 / 2×RS232 / 2×RS485	Dual serial devices in wired control rooms
Y204-R	Ethernet	4 (Standard DTU)	4×RS232 / 4×RS485 / Mixed	SCADA panels aggregating multiple meters/sensors
Y208-R	Ethernet	8 (Standard DTU)	8×RS232 / 8×RS485 / Mixed	High-density serial consolidation with one IP uplink

MiniLink First-Pass Model Selection

Start with the job and network path. This matrix brings the former Y201 uplink choices and compact Y301 I/O options into one first-pass comparison before confirming the exact SKU.

Model	Main role	Key interface / network path	Choose it for
Y201-G	Cellular serial DTU	LTE Cat.1; one serial port; RS232, RS485 or TTL SKU; 9–36 VDC.	Remote sites without reliable wired LAN.
Y201-R	Ethernet serial DTU	RJ45 Ethernet; one serial port; RS232, RS485 or TTL SKU; 5–36 VDC.	Fixed LAN, SCADA or BMS projects.
Y201-W	Wi-Fi serial DTU	2.4/5 GHz Wi-Fi; AP/STA/AP+STA; two serial ports; 5–36 VDC.	Wireless retrofits where Ethernet cabling is impractical.
Y301-110	Compact mixed I/O	1DI + 1DO + RS485 Modbus RTU; 5–36 VDC.	Alarm plus one actuator point.
Y301-020	Dual relay I/O	2DO + RS485 Modbus RTU; 5–36 VDC.	Two-output pump, valve or lighting switching.

Y201 Selection FAQ

Use these answers to frame the first product and network discussion before confirming a project configuration.

Which Y201 variant should I choose for my site?

Choose Y201-G when the site needs LTE Cat.1 cellular backhaul, Y201-R when a stable RJ45 Ethernet connection is available, and Y201-W when local 2.4/5 GHz Wi-Fi is available or Ethernet cabling is impractical. Confirm the serial interface, protocol and power conditions before ordering.

Can a Y201 connect Modbus RTU devices to a cloud platform?

Yes. The serial-to-network path can carry Modbus RTU devices to an IP network, and Modbus RTU-to-TCP is available when enabled. TCP, UDP, HTTP and MQTT support depends on the selected model and configuration, so confirm the cloud protocol and data path before ordering.

What information is needed to size a Y201 deployment?

Share the device model and protocol, quantity, serial interface, required uplink, network availability, power supply and cloud or SCADA endpoint. Also note baud rate, data direction, distance and any offline or buffering requirement so the technical team can confirm the architecture.

Which serial interfaces and baud rates are supported?

RS232, RS485 or TTL is available depending on the SKU, with supported baud rates ranging from 1,200 to 460,800 baud. Y201-W provides two serial ports; confirm the exact interface combination and protocol mode in the selected model documentation.