TTK-TRB255 Teltonika Industrial Dual-SIM LTE Gateway to I/O / Ethernet / RS232 / RS485 / with GPS

TTK-TRB255

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Teltonika Industrial Dual-SIM LTE Gateway to I/O / Ethernet / RS232 / RS485 / with GPS

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TTK-TRB255

Wireless Routers (SIM / 5G / 4G / LTE / 3G)

Teltonika

TTK-TRB255 information and overview

Teltonika TRB255 Industrial dual-sim LTE Gateway to I/O / Ethernet / RS232 / RS485 / with GPS, Nb-iot device, Dual SIM, 2x SMA, 1x RJ45, 16 - pin connector block for I/O & RS233/485

Specifications & more information about TTK-TRB255, Wireless Routers (SIM / 5G / 4G / LTE / 3G) manufactured by Teltonika

Specifications & downloads View specification Printable PDF

Product information notice: Some specifications may describe a broader product range and may not apply to this exact model. Use the product summary above as the primary model reference. Bundled software may be trial software and can require a separate licence.

Overview:

TRB255 can be used to integrate modern and legacy industrial equipment into one solution via RS232, RS485 & Ethernet interfaces.

Features:

Connectivity: 4G/LTE (Cat M1), NB-IoT, 2G
Dual SIM with auto failover, backup WAN and other switching scenarios
Serial Ports: RS232/RS485 serial communication interfaces
9-30V Wide range of supported power supply voltages
I/O Multiple Inputs and Outputs for remote monitoring and control
GNSS Global Navigation Satellite System for location services with geofencing functionality

CONNECTIVITY
4G/LTE (Cat M1), NB-IoT, 2G

DUAL SIM
With auto failover, backup WAN and other switching scenarios

SERIAL PORTS
RS232/RS485 serial communication interfaces

9-30V
Wide range of supported power supply voltages

I/O
Multiple Inputs and Outputs for remote monitoring and control

GNSS
Global Navigation Satellite System for location services with geofencing functionality

Specifications:

© 2026 Respective owners and brand holders. This table has been carefully researched and generated by ComXpert International CC (//www.comx-computers.co.za), however, errors and omissions may occur. Only references to South Africa apply. All products are sourced in South Africa from the official suppliers and the warranty is that of the local supplier. E&OE. This table and our site's content may be used on condition that this notice and link remains intact and unaltered.
Specifications and features
Product Code	TTK-TRB255
MOBILE
Mobile module	LTE (Cat M1) / NB-IoT / EGPRS
SIM switch	2 SIM cards, auto-switch cases: weak signal, data limit, SMS limit, on roaming, no network, network denied, data connection fail
Status	Signal strength (RSSI), SINR, RSRP, RSRQ, EC/IO, RSCP Bytes sent/received, connected band, IMSI, ICCID.
SMS/Call	SMS status, SMS configuration, send/read SMS via HTTP POST/GET, EMAIL to SMS, SMS to EMAIL, SMS to HTTP, SMS to SMS, scheduled SMS, SMS autoreply, Call utilities
USSD	Supports sending and reading Unstructured Supplementary Service Data messages
Black/White list	Operator black/white list
Band management	Used band status display, Band lock
APN	Auto APN
Bridge	Direct connection (bridge) between mobile ISP and device on LAN
Multiple PDN	Possibility to use different PDNs for multiple network access and services
ETHERNET
LAN	1 x LAN port 10/100 Mbps, comply IEEE 802.3, IEEE 802.3u standards, supports auto MDI/MDIX crossover (Configurable to work as WAN port)
NETWORK
Routing	Static routing, Dynamic routing (BGP, OSPF v2, RIP v1/v2) (planned)
Network protocols	TCP, UDP, IPv4, IPv6, ICMP, NTP, DNS, HTTP, HTTPS, FTP, SMTP, SSL v3, TLS, ARP, PPP, SSH, DHCP, Telnet, MQTT, Wake On Lan (WOL)
VoIP passthrough support (planned)	H.323 and SIP-alg protocol NAT helpers, allowing proper routing of VoIP packets
Connection monitoring	Ping Reboot, Periodic Reboot, LCP and ICMP for link inspection
Firewall	Port forward, traffic rules, custom rules
DHCP	Static and dynamic IP allocation, DHCP Relay
QoS / Smart Queue Management (SQM) (planned)	Traffic priority queuing by source/destination, service, protocol or port, WMM, 802.11e
DDNS	Supported >25 service providers, others can be configured manually
SSHFS	Possibility to mount remote file system via SSH protocol
SECURITY
Authentication	Pre-shared key, digital certificates, X.509 certificates
Firewall	Pre-configured firewall rules can be enabled via WebUI, unlimited firewall configuration via CLI, DMZ, NAT, NAT-T
Attack prevention	DDOS prevention (SYN flood protection, SSH attack prevention, HTTP/HTTPS attack prevention), port scan prevention (SYN-FIN, SYN-RST, X-mas, NULL flags, FIN scan attacks)
VLAN (planned)	Tag based VLAN separation
Mobile quota control	Custom data limits for both SIM cards
WEB filter (planned)	Blacklist for blocking out unwanted websites, Whitelist for specifying allowed sites only
Access control	Flexible access control of TCP, UDP, ICMP packets, MAC address filter
VPN
OpenVPN	Multiple clients and server can be running simultaneously, 12 encryption methods
OpenVPN Encryption	DES-CBC, RC2-CBC, DES-EDE-CBC, DES-EDE3-CBC, DESX-CBC, BF-CBC, RC2-40-CBC, CAST5-CBC, RC2-64-CBC, AES-128-CBC, AES-192-CBC, AES-256-CBC
IPSec	IKEv1, IKEv2, with 5 encryption methods (DES, 3DES, AES128, AES192, AES256)
GRE	GRE tunnel
Stunnel (planned)	Proxy designed to add TLS encryption functionality to existing clients and servers without any changes in the program's code
PPTP, L2TP	Client/Server services can run simultaneously, L2TPv3 support
DMVPN (planned)	Method of building scalable IPsec VPNs
SSTP (planned)	SSTP client instance support
ZeroTier	ZeroTier VPN client support
WireGuard	WireGuard VPN client and server support
SERIAL COMMMUNICATION MODES
Modes	Console, OverIP, Modem (Full or Partial control), MODBUS RTU master, MODBUS gateway, NTRIP client (planned)
MODBUS TCP SLAVE
ID filtering	Respond to one ID in range [1, 255] or any
Allow remote access	Allow access through WAN
Custom registers	MODBUS TCP custom register block, which allows to read/write to a file inside the router, and can be used to extend MODBUS TCP slave functionality
MODBUS TCP MASTER
Supported functions	01, 02, 03, 04, 05, 06, 15, 16
Supported data formats	8 bit: INT, UINT, 16 bit: INT, UINT (MSB or LSB first), 32 bit: float, INT, UINT (ABCD (big-endian), DCBA (little-endian), CDAB, BADC), HEX, ASCII
MODBUS RTU MASTER
Supported baud rates	From 300 to 3000000
Supported functions	01, 02, 03, 04, 05, 06, 15, 16
Supported data formats	8 bit: INT, UINT, 16 bit: INT, UINT (MSB or LSB first), 32 bit: float, INT, UINT (ABCD (big-endian), DCBA (little-endian), CDAB, BADC), HEX, ASCII
Number of data bits	7 or 8
Number of stop bits	1 or 2
Parity bits	None, Even, Odd
Flow control	None, RTS/CTS (only for RS232 interface), Xon/Xoff
MQTT GATEWAY
Gateway	Allows sending commands and receiving data from MODBUS Master trough MQTT broker
DATA TO SERVER
Protocols	HTTP(S), MQTT, Azure MQTT, Kinesis
MONITORING & MANAGEMENT
WEB UI	HTTP/HTTPS, status, configuration, FW update, CLI, troubleshoot, event log, system log, kernel log
FOTA	Firmware update from server, automatic notification
SSH	SSH (v1, v2)
SMS	SMS status, SMS configuration, send/read SMS via HTTP POST/GET
TR-069	OpenACS, EasyCwmp, ACSLite, tGem, LibreACS, GenieACS, FreeACS, LibCWMP, Friendly tech, AVSystem
MQTT	MQTT Broker, MQTT publisher
SNMP	SNMP (v1, v2, v3), SNMP Trap
JSON-RPC	Management API over HTTP/HTTPS
MODBUS	MODBUS TCP status/control
RMS	Teltonika Remote Management Systems (RMS)
IoT PLATFORMS
Cloud of Things	Allows monitoring of: Device data, Mobile data, Network info, Availability
ThingWorx	Allows monitoring of: WAN Type, WAN IP Mobile Operator Name, Mobile Signal Strength, Mobile Network Type
Cumulocity	Allows monitoring of: Device Model, Revision and Serial Number, Mobile Cell ID, ICCID, IMEI, Connection Type, Operator, Signal Strength, WAN Type and IP
Azure IoT Hub	Can send device IP, Number of bytes send/received/ 3G connection state, Network link state, IMEI, ICCID, Model, Manufacturer, Serial, Revision, IMSI, Sim State, PIN state, GSM signal, WCDMA RSCP, WCDMA EC/IO, LTE RSRP, LTE SINR, LTE RSRQ, CELL ID, Operator, Operator number, Connection type, Temperature, PIN count to Azure IoT Hub server
SYSTEM CHARACTERISTICS
CPU	Qualcomm QCA9531, MIPS 24kc, 650 MHz
RAM	64 MB, DDR2
Flash storage	16MB SPI Flash (4 MB available for user)
FIRMWARE / CONFIGURATION
WEB UI	Update FW from file, check FW on server, configuration profiles, configuration backup
FOTA	Update FW/configuration from server
RMS	Update FW/configuration for multiple devices
Keep settings	Update FW without losing current configuration
FIRMWARE CUSTOMIZATION
Operating system	RutOS (OpenWrt based Linux OS)
Supported languages	Busybox shell, Lua, C, C++
Development tools	SDK package with build environment provided
LOCATION TRACKING
GNSS	GPS, GLONASS, BeiDou, Galileo and QZSS
Coordinates	GNSS coordinates via WebUI, SMS, TAVL, RMS
NMEA	NMEA 0183
NTRIP (planned)	NTRIP protocol (Networked Transport of RTCM via Internet Protocol)
Server software	Supported server software TAVL, RMS
Geofencing	Configurable multiple geofence zones
INPUT/OUTPUT
Configurable I/O	3 x Configurable Inputs/Outputs. Digital input 0 - 6 V detected as logic low, 8 - 30 V detected as logic high. Open collector output, max output 30 V, 300 mA
Analog input	1 x Analog input (0 - 30 V)
Output control	HTTP POST/GET, Schedule
Events	SMS, Email
I/O juggler	Allows to set certain I/O conditions to initiate event
SERIAL
RS232	Terminal block connector: TX, RX, RTS, CTS
RS485	Terminal block connector: D+, D-, R+, R- (2 or 4 wire interface)
Supported baud rates	From 300 to 3000000
Number of data bits	7 or 8
Number of stop bits	1 or 2
Parity	None, Even, Odd
Flow control	None, RTS/CTS (only for RS232 interface), Xon/Xoff
POWER
Connector	2 pins in 16 pin industrial terminal block
Input voltage range	9 - 30 VDC, reverse polarity protection, surge protection +/-1 kV 50 µs max
Power consumption	Idle: <1.2 W, Max: <5 W
PHYSICAL INTERFACES (PORTS, LEDS, ANTENNAS, BUTTON, SIM)
Ethernet	1 x RJ45 port, 10/100 Mbps
I/O's	3 x Configurable I/O, 1 x Analog input in 16 pin terminal block
Status LEDs	3 x connection status LEDs, 3 x connection strength LEDs, 1 x power LED, 1 x Eth port status LED
SIM	2 x SIM slots (Mini SIM - 2FF), 1.8 V/3 V, double stacked SIM tray
Power	2 pins in 16 pin terminal block
Antennas	1 x SMA connector for Mobile, 1 x SMA connector for GNSS
RS232	4 pins in 16 pin terminal block (TX, RX, RTS, CTS)
RS485	4 pins in 16 pin terminal block (D+, D-, R+, R-)
Reset	Reboot/User default reset/Factory reset button
PHYSICAL SPECIFICATION
Casing material	Aluminium housing with DIN rail mounting option
Dimensions (W x H x D)	83 x 25 x 74.2 mm
Weight	165 g
Mounting options	DIN rail, wall mounting (additional kits needed), flat surface placement
OPERATING ENVIRONMENT
Operating temperature	-40 °C to 75 °C
Operating humidity	10% to 90% non-condensing

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The best price and guaranteed service and backup from official computer suppliers in South Africa for the TTK-TRB255 Teltonika Industrial Dual-SIM LTE Gateway to I/O / Ethernet / RS232 / RS485 / with GPS.

The Teltonika TTK-TRB255 Teltonika Industrial Dual-SIM LTE Gateway to I/O / Ethernet / RS232 / RS485 / with GPS is available for R 3260. The product is sold by ComX Computers as new. Prices are valid today 2026-10-11 (before 2026-10-12, by quote, while stocks last). The product is expected to be in stock, although this is not guaranteed.

Available from this online computer store delivering door-to-door in Johannesburg, Cape Town, Port Elizabeth, Pretoria, Pietermaritzburg, Polokwane, Durban and all over South Africa.

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