Products | KET-RMB-211

Master ModBUS RTU Wireless

The KET-RMB-211 can handle up to 32 ModBUS RTU slave devices connected to its RS485 port. The device can be programmed to read a set of registers and send them to the Gateway.

The integrated Repeater functionality reduces the number of required nodes and increases network reliability.

Is equipped with an extended radio range that allows to reach over 1000 m in free air.

The standard antenna connector supports 90° joint antennas or cabled ones for placement outside the electrical panel.

Maximum flexibility of power supply, direct from the mains or low voltage, both DC and AC.

Format suitable for mounting in electrical panel on DIN-rail.

 

GENERAL SPECIFICATIONS
Protection Range IP50
Operative Temperature -20 ÷ +60 °C
CASE
Dimensions 53,5 x 110 x 61 mm (W x H x D)
Mounting DIN rail or Wall mounting with supplied supports
Required DIN modules 3 DIN modules
Electric Board Type Industrial or switchboard
Material Blend PC/ABS sel extinguishing UL94-VO
POWER SUPPLY
Supply Voltage 12 ÷ 24 VDC, 12 ÷ 20 VAC; 230 VAC with integrated power supply
Consumption < 1.5 W @ 12 ÷ 20 VAC / < 1.5 W @ 12 ÷ 24 VDC / < 1.5 W @ 230 VAC
Connectors types Screw terminal
RS485 INTERFACE
Supported Protocols Master ModBUS RTU with 32 slave
Connectors types Screw terminal
RADIO MODULE
Supported Protocols X-Monitor Protocol (X-MP) / IEEE 802.15.4 / ZigBee™ Pro 2.0
Radio Frequency 2.4 GHz ISM Band
Output Power +3 ÷ +20 dBm
Sensitivity -104 dBm
Antenna Type RPSMA connector, 90° antenna supplied
Max Distance (Free Air) Over 1000 m
FUNCTIONALITY
Radio Signal Indicator Integrated (LinkQuality)
Output Power Adjustment From local keyboard and remotely
Firmware Upgrade Via radio

Photo Code Description
2.4 GHz small antenna with cable 40 cm and RPSMA connector
KET-ANT-203

2.4 GHz small antenna with cable 40 cm and RPSMA connector

2.4 GHz Omnidirectional fiberglass antenna with 5 dBi gain
KET-ANT-300.S

2.4 GHz Omnidirectional fiberglass antenna with 5 dBi gain

2.4 GHz small antenna with cable 100 cm and RPSMA connector
KET-ANT-204

2.4 GHz small antenna with cable 100 cm and RPSMA connector


Photo Code Description
Advanced X-Monitor gateway with 3G/4G/NB-IoT/LTE-M modem and Wi-Fi™
KET-GZE-310

Advanced X-Monitor gateway with 3G/4G/NB-IoT/LTE-M modem and Wi-Fi™

Amplified Wireless Repeater
KET-RMB-220

Amplified Wireless Repeater

Wireless Temperature, Humidity and Light sensor for outdoor use
KET-THL-200.S

Wireless Temperature, Humidity and Light sensor for outdoor use

Wireless ambient sensor of indirect CO2 and volatile organic compounds
KET-AIR-200

Wireless ambient sensor of indirect CO2 and volatile organic compounds

ModBUS sensor for indirect CO2 and air quality measurement
KET-AIR-210

ModBUS sensor for indirect CO2 and air quality measurement

Wireless control module with 0-10 V output
KET-DIM-100

Wireless control module with 0-10 V output

Flow meter for compressed air and gas insertion or inline
KET-MPA-000

Flow meter for compressed air and gas insertion or inline

Pulse Counter Wireless Device
KET-MES-200

Pulse Counter Wireless Device

Smart supervisor for rack Slave Wireless and ModBUS version
KET-RKS-100

Smart supervisor for rack Slave Wireless and ModBUS version

Smart supervisor for rack Master wireless with LTE modem version
KET-RKM-100

Smart supervisor for rack Master wireless with LTE modem version

Amplified Wireless Repeater
KET-RMB-210

Amplified Wireless Repeater

Wireless outdoor brightness sensor
KET-SLE-100

Wireless outdoor brightness sensor

ModBUS Logic Controller
KET-PLC-200

ModBUS Logic Controller

Three phase network analyzer with Display - MID certified
KET-PMT-218

Three phase network analyzer with Display - MID certified

ModBUS RS485 module with 16 inputs - 8 digital outputs
KET-IOD-100

ModBUS RS485 module with 16 inputs - 8 digital outputs

Multi-channel Power Meter comprising 4 groups of 3 CTs of 100 A
KET-PMT-414.16

Multi-channel Power Meter comprising 4 groups of 3 CTs of 100 A

Three-phase energy meter with direct connection display up to 80 A
KET-PMT-228

Three-phase energy meter with direct connection display up to 80 A

Panel-mounted, three-phase power meter for current transformers
KET-PMT-247

Panel-mounted, three-phase power meter for current transformers

Single-phase energy meter up to 80 A
KET-PMM-301

Single-phase energy meter up to 80 A

Presence, temperature and light environmental sensor with ModBUS interface
KET-TLP-110

Presence, temperature and light environmental sensor with ModBUS interface

ModBUS sensor for indirect CO2 and air quality measurement
KET-AIR-210

ModBUS sensor for indirect CO2 and air quality measurement

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© 2025 Kerberos. All Rights Reserved | Kerberos, X-Monitor and MaggiorDOMO are registered / filed trademarks of Kerberos Srl Single-Member Limited Liability Company - VAT No. - Tax ID No. 03929170284 - R.E.A. 348334 - C.C.I.A.A. 03929170284 - Share Capital € 100,000.00 fully paid-up.