Radiocrafts
Embedded Wireless Solutions
RC1180-MBUS
2008 Radiocrafts AS RC1180-MBUS Data Sheet (rev. 2.00) Page 3 of 16
Quick Product Introduction
How do I transmit data?
Send your data to the RXD pin on the module. Use the UART format with settings (19200, 8,
1, N, no flow control). Up to 128 bytes are buffered in the module. The first byte of the
message should contain the message length. The module will transmit the data when the
whole packet is received.
How do I receive data?
Any received data packet with correct M-Bus format and check sums will be sent on the TXD
pin. Optionally the meter address (first M-Bus block) is added to the data string. The RSSI
value (received signal strength) can optionally be added to the message.
What about the antenna?
In most cases a simple quarter wavelength wire or a PCB track will do. Connect a piece of
wire to the RF pin with length corresponding to the quarter of a wavelength. For space limited
products, contact Radiocrafts and we will recommend the best antenna solution for your
application.
How do I change the M-Bus mode, RF channel or any other parameter?
To change configurable parameters, send one byte to the module with the value 0x00. This
will take the module into configuration mode. Special commands are then used to access the
configuration registers and test modes. Exit from configuration mode by sending the ‘X’
command. Parameters can be changed permanently and stored in non-volatile memory in the
module.
Wireless M-Bus Modem
The standard RC1180-MBUS module acts like a wireless M-Bus modem with a UART
interface. The embedded protocol transmits and receives the wireless M-Bus data packets
based on application messages from an external source (the meter or the concentrator). The
module automatically adds the Command field, the Manufacturer ID and the unique Address
based on parameters configured in the module. The UART data can easily be converted to
USB or RS485/232 to interface external equipment. The module is configured through its
UART interface using a simple command set. Configuration parameters are stored in non-
volatile memory. The module can be set in Sleep mode with very low current consumption,
and wake up on a UART command. The protocol for UART application messages (see MBUS
User Manual for details) is as follows:
From meter to module:
1 byte 1 byte n bytes
Length CI APP_LAYER
From module to other (with meter address):
1 byte 1 byte 2 bytes 6 bytes 1 byte n bytes 1 byte
Length C ManID Address CI APP_LAYER RSSI (opt)
From module to other (without meter address):
1 byte 1 byte n bytes 1 byte
Length CI APP_LAYER RSSI (opt)
Similar commands are available for configuration via the UART interface.
