Wireless RF Modules and dongles for IoT | Coral RF

This application note describes how the CC1120 high performance transceiver, when used together with the ultra-low power MSP430 or STM32L05xx microcontrollers, implement a fully compliant Wireless M-Bus (wM-Bus) subsystem.

The EN13757-4:2012 draft is a European communication standard for wireless read out of meters and defines the physical and the data link layers. The CC1120 have market leading sensitivity and blocking performance and combined with the ability to comply with frequency offset and data rate variations, as defined In S - and T mode, they are a perfect fit for1 This application description describes CC1120 high performance transceiver, when used with Ultra low power MSP430 or STM32L05xx Microcontroller, implementing Compatible wireless M-Bus (wM Bus) subsystem.

The draft EN13757-4:2012 is a European standard Wireless communication standard Meter reading and defining physics and data link layer. CC1120 has market leading sensitivity and blocking performance able to adapt to frequency offsets and data rate changes, as defined In S and T mode, they are very suitable bulk metering and sub metering WM bus application.

Na/b/c/d/e/f mode definition 16 bits Leader length. Wave Match（tm）This function allows you to use The preamble length is only 4 bits. Therefore CC1120 fully conforms to N mode Transceivers for 169 MHz wM bus systems For example, smart gas meter or water meter. Various MSP430 or STM32L05xx devices can Run TI wM bus stack, including the newest member of the Wolverine family——TI's MSP430 microcontroller based on ULP FRAM.

Wireless M-Bus

The wireless M-Bus standard specifies the communication between a meter and an “other”system component, e.g. mobile/stationary readout devices or data collectors.

Wireless M-Bus network

Three original PHY Layer modes from 2005 were defined in [1] for the communicationbetween a meter and an “other”:

S-Mode, Stationary Modeo S1-Mode, one-way communication from meter to “other”

S1m-Mode, one-way communication from meter to “other”

S2-Mode, two-way communication between meter and “other”

T-Mode, Frequent Transmit Modeo

T1-Mode, one-way communication from meter to “other”

T2-Mode, two-way communication between meter and “other”

R-Mode, Frequent Receive Mode

R2-Mode, two-way communication between meter and “other

The three new modes, introduced in 2011, are also supported by CC1120 performance line:

N-Mode, Stationary Mode

N1-Mode, one-way communication from meter to “other”

N2-Mode, two-way communication from meter to “other”
N2g-Mode, two-way communication between meter and “other”

C-Mode, Frequent Transmit Mode

C1-Mode, one-way communication from meter to “other”

C2-Mode, two-way communication between meter and “other”

F-Mode, Frequent Transmit Mode

F1-Mode, one-way communication from meter to “other”

F2-Mode, two-way communication between meter and “other”

In addition, two more modes, named P and Q, were defined in the EN13757-5:2008 standard, with the goal to support the implementation of wM-Bus Repeaters. Both P and Q modes are defined for the 169Mhz and 868MHz ISM band and are fully supported by the CC1120.

In this document P and Q modes are not reviewed due to their limited use in real world applications so far.

For each wM-Bus mode, 6 different CC1120 board are tested at room temperature 25°C and 3V supply.

For T mode 250 kHz RX BW is required to handle the 12% datarate tolerance hence CC1125 board with 40 MHz XTAL are tested.

The system is calibrated to account for the cable loss between generator(s) and DUT.
The frequency offset between DUT and RF generator is compensated for.
Sensitivity / Packet Error Rate (PER) is tested according to EN137574:2012 draft:

80% PER with 20 bytes payload;
and additionally for 20% PER with 8 bytes payload;
and 1% PER with 8 bytes payload.

The CC1120 board and CC1190 cc1190 board uses a single antenna 50 ohm SMA connector, also known as combined TX and RX design. The sensitivity (PER) is measured with a combined match at the single antenna port (SMA connector or IPEX connector ).
CC1120 board