RBMTX-Lite Connectors

This page contains connectors description of RBMTX-Lite router.

Power supply connector

Please use power adapter which is included in package. It ensures “clean” power supply input and avoids short transients on power supply lines originating from inductive load switching. The power supply connector is a 2-pin connector for external DC power supply. Power supply range of RBMTX-Lite is 9..30V DC, maximum continuous (average) supply power is 5W and peak (momentary) supply current is 1A.

Pin	Name	Direction	Description
+	V+	IN	9..30V DC, maximum continuous (average) supply power is 5W and peak (momentary) supply current is 1A
-	GND	-	Ground

NOTE: The device is switched off by removing the external power supply from the electric socket. The electric socket must be located close to the device and easily accessible.

Main SIM card holder

External, main SIM card holder is placed at the front of the RBMTX-Lite router (as shown below). To insert a SIM card into the holder, press the yellow button, eject the black drawer, place the SIM card inside it and insert drawer into the modem (you will hear "click"). To operate the module in a GSM/LTE network, it is necessary to insert active SIM card from the network provider.

Second SIM card is located inside the device. Unscrew one of the router panel, eject the board and put internal SIM card into holder.

Antenna connectors

GSM antenna connector

SMA antenna connector placed on back panel is used to connect external GSM/UMTS/LTE. It must be connected to establish a connection with GSM/UMTS/LTE network. In good circumstances (good coverage, level of received signal is high) use antenna which is included in package. When signal strength is poor please use outdoor directional/omnidirectional or indoor antenna.

Note: If antenna is not connected, connection with GSM/UMTS/LTE network will be impossible. Note: Make sure you don't tighten the antenna too much. The torque setting of SMA connector is 0.15 – 0.20 NM.

WiFi + Bluetooth and GNSS antenna connector (option)

Router can be optionally equipped with WiFi+Bluetooth or GNSS receiver (select the appropriate router variant when ordering). SMA antenna connector placed on {{{wifi_place}}} panel is used to connect external WiFi+Bluetooth or GNSS antenna. WiFi+Bluetooth antenna connector type is SMA male, but GNSS antenna connector type is female (the same as for GSM/UMTS/LTE antenna). There is no variant with WiFi+Bluetooth and GPIO (no space for both SMA and GPIO connectors).

Note: If the antenna is not connected, connection with WiFi/Bluetooth network/GNSS system will be impossible. To let the router get the correct position (NMEA coordinates) put the antenna outside (in a place where the GNSS system is visible).
Note: Make sure you don't tighten the antenna too much. The torque setting of SMA connector is 0.15 – 0.20 NM.

Interfaces

Serial ports

Serial RS232 and RS485 port (RJ-45 connector marked as “RS232/485”) is placed on front panel of router. Pinout is described in the table below:

RS232/RS485 signal	RJ45 connector
A	1
5V	2
B	3
GND	4
TX	5
RX	6
RTS	7
CTS	8

LAN connector

Second RJ-45 connector (marked as "LAN") is placed next to serial connector and is used for communication with PC or laptop through Ethernet interface. WWW configuration is available in the web browser (default IP address is 192.168.1.234). You can change the default IP address in RBMTX-Lite_QuickSetup.
WARNING: Do not connect the PoE (Power-over-Ethernet) connection to the LAN port. Otherwise it may damage the device!

"R" button - factory reset

To reset the router to the factory default configuration push the "R" button for at least 5 seconds, then release it and wait for system boot.

TR switch

TR switch is is used to add the termination resistance for RS485 interface.