Name: TP-Link TL-WR840N Wireless N Router - INOSAKI
SKU: TP-Link-TL-WR840N
Price: 22.89 USD
Availability: InStock

Technical Overview

300 Mbps 2.4 GHz wireless router with four 10/100 Mbps LAN ports, one WAN port, 9VDC/0.6A power input, two 5dBi antennas, and Router/AP/Range Extender modes.

Key Features

300 Mbps wireless speed on the 2.4 GHz band compliant with IEEE 802.11b/g/n standards
Four 10/100 Mbps RJ45 LAN ports and one 10/100 Mbps RJ45 WAN port
Supports 4-in-1 multi-modes: Router, Access Point, Range Extender, and WISP modes
Two fixed 5 dBi omnidirectional antennas for robust wireless signal coverage
One-touch wireless security encryption with the WPS/Reset button
IP-based Bandwidth Control (QoS) for allocating speed to each connected device
Advanced security protocols including WPA/WPA2, SPI Firewall, and IP & MAC Binding

Technical Specification Matrix

Parameter	Value
Wireless Standards	IEEE 802.11n, IEEE 802.11g, IEEE 802.11b
Frequency	2.4 - 2.4835 GHz
Signal Rate	11n: Up to 300Mbps (dynamic)
Interface	4 x 10/100Mbps LAN Ports, 1 x 10/100Mbps WAN Port
Button	WPS/Reset Button
External Power Supply	9VDC / 0.6A
Antenna	2 x Fixed 5dBi Omni-directional Antennas
EIRP	< 20dBm (EIRP)
Working Modes	Router Mode, Access Point Mode, Range Extender Mode, WISP Mode
Wireless Security	WEP, WPA / WPA2, WPA-PSK / WPA2-PSK
Protocols	IPv4, IPv6
Operating Temperature	0°C to 40°C (32°F to 104°F)
Storage Temperature	-40°C to 70°C (-40°F to 158°F)
Operating Humidity	10% to 90% non-condensing
Storage Humidity	5% to 90% non-condensing
Physical Weight (kg)	0.14
Dimensions L x W x H (cm)	18.2 x 12.8 x 3.5

Industrial Applications

1. Localized Machine-to-Machine (M2M) Control Network Bridging

Deploying the router in 'Access Point' or 'WISP' mode to bridge isolated industrial machines (PLCs) with local control units in environments requiring wireless 2.4GHz IEEE 802.11n telemetry without laying long cabling runs.

Problem Solved

Eliminates high cabling costs and installation complexity in legacy industrial layouts by establishing a secure, local 300Mbps wireless link for Modbus/TCP or EtherNet/IP protocol communications.

M2MPLC Bridging802.11n TelemetryWISP ModeModbus/TCP

2. Secure IP Surveillance Camera Wireless Hub

Configuring the device to provide a dedicated, isolated SSID (via Guest Network or VLAN-supported Access Point mode) to aggregate multiple 2.4GHz IP security cameras in small warehouses.

Problem Solved

Keeps operational manufacturing data traffic separated from bandwidth-heavy surveillance feeds using built-in IP-based Bandwidth Control (QoS) and WPA2 security encryption.

IP Camera AggregationGuest Network IsolationIP-based QoSWPA2 Encryption

3. Compact Local SCADA HMI Wireless Access Point

Utilizing the 9VDC low-power input and small form-factor (182 x 128 x 35 mm) to integrate the router inside control enclosures, providing local wireless HMI connectivity to field engineers' tablets.

Problem Solved

Allows site maintenance engineers to securely monitor local HMI data wirelessly from outside a sealed, high-voltage electrical cabinet, using IP & MAC Binding and SPI Firewall security rules.

Wireless HMIControl Cabinet IntegrationSPI FirewallIP & MAC Binding9VDC Input