RB900L3 Connectors

This page contains connectors description of RB900L3 modem.

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 RB900L3 is 5..30 V DC, 2.5 W max. continuous power.

Pin	Name	Direction	Description
+	V+	IN	5..30 V DC, 2.5 W max. continuous power
-	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 RB900L3 modem (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.

Antenna connectors

GSM antenna connector

SMA “ANT” input is used to connect external GSM/LTE antenna. To establish a connection with a GSM/LTE network, an external antenna must be used. Type of antenna depends of GSM/LTE coverage. In good circumstances (level of received signal is high) use antenna contained in the package. If the range of GSM/LTE is low or none, an outdoor or indoor (for instance in place where GSM/LTE range is sufficient) antenna should be used.
Note: If there is no antenna connected to SMA connector, the connection with GSM/LTE network is impossible.

GPS/GNSS antenna connector

An SMA "GNSS" input is used to connect an external GNSS antenna. To establish connection with GPS/GNSS sattelites and check the coordinates of the device, an external antenna must be used and should be located outdoors.

Interfaces

Front

Back

USB

RB900L3 modem is equipped with a USB interface (as shown below) – miniUSB connector.

RS232

RB900L3 modem is equipped with an RS232 interface (as shown below). The DE9 DSUB socket is connected via a voltage level translator circuit to the GSM/LTE module.

Table of RS232 pins (DCE female connector):

Pin	Name	Direction	Description
1	DCD	OUT	Data Carrier Detect
2	RXD	OUT	Receive Data (a.k.a Rx, RD)
3	TXD	IN	Transmit Data (a.k.a Tx, TD)
4	DTR	IN	Data Terminal Ready
5	GND	-	Ground
6	DSR	OUT	Data Set Ready
7	RTS	IN	Request To Send
8	CTS	OUT	Clear To Send
9	RI	OUT	Ring Indicator