M-BUS RF Click

How does it work?

M-BUS RF Click is based on the ME70-169, a wireless M-BUS module compliant with the EN13757 part4 2013 from Telit. To transmit data, the M-BUS M Click uses an SMA connector, where with the appropriate antenna, it can achieve up to 20km of range with output power in the range from 12dBm up to 30dBm in 3dB steps. The sensitivity is -119dBm at 2.4Kbps of data rate, and the radio data rate can be set at 2.4, 4.8, and 19.2Kbps by choosing one of the GFSK, GMSK, and 4GFSK modulations. For that purpose, the module features nine channels: eight channels on 12.5KHz bandwidth for GFSK, or GMSK, and one channel on 50KHz for 4GFSK modulation. In terms of security, this Click board™ uses AES and NRZ encryptions. The ME70-169 module has its own 128KB of FLASH, 8KB RAM, and 2KB EEPROM memory and supports DotA (download over the air) for upgrading the firmware.

For communication with the host microcontroller, the ME70-169 uses the UART interface of the mikroBUS™ socket with commonly used UART RX and TX pins as its default communication protocol operating from 1200 up to 115200bps to transmit and exchange data. The user can use the module as a simple ready-to-use modem, using AT commands over UART. In addition, this Click board™ features hardware CTS and RTS flow control pins. To reset the module, there is an RST pin, as active LOW with internal pull-up.

This Click board™ can only be operated with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development.

Specifications

Pinout diagram

This table shows how the pinout on M-BUS RF Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
Reset	RST	2	RST	INT	15	RTS	UART CTS
SPI Chip Select	RTS	3	CS	RX	14	TX	UART TX
	NC	4	SCK	TX	13	RX	UART RX
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

M-BUS RF Click electrical specifications