[Wireless M-Bus] “The W MBus network will contain repeaters to transmit data from 868 MHz to 169 MHz. We want repeaters in Battery operated mode. 1. We plan to put Repeaters in long sleep mode and arrival of packet from nodes would wake Repeater. This design would be similar to Data collector/Concentrator design envisaged in Wireless M Bus specs. Alternatively we can design time synchronized wake-up algorithm so that all nodes wake up at the same time (including repeater) and after data transmission, all nodes go back to sleep mode. What would you recommend?”

[W-MBUS] As far as the data format is concerned, the “”MBUS-CCT user manual”” states: “”To send ASCII characters, type them in and hit the enter key or click on the send once button””. In case bytes have to be sent, we know that te first byte should be the Length byte. We tried to transmit the same bytes sequence shown as an example in the user manual (pag. 4): ‘5 0x33 0x25 6 78 7’. In both cases (ASCII and bytes transmission) nothing is transmitted across the link (or at least nothing appears at the receiver side). Comments?

[W-MBUS] “we have a problem with the configuration of RC1700HP(MBUS4). We start our micro and we start the comunicacion for the uart with the radiocraft RC1700HP likewise with the RC1180 MBUS3 (with a low level in the nConfig pin) but the Radiocraft RC1700HP don’t responde (with the symbol >). We watch with the oscilloscope that in the pin RTS/SLEEP in this case we have a High level and in the RC1180 we have a low level, could be this the problem, you know why can be? The supply that we use for the RC1700HP is Vcc = 2.5v and Vcc_PA = 3.6v. Is this ok? “

[W-MBUS] “We are interested in using Radiocrafts modules in our product. We need to install around 150+ sensors per house which are connected to one concentrator (master) device. Sensor are small and therefore using external antenna is not an option which may be problematic when using 169MHz? Those sensors are installed into houses with concrete walls and range requirements are therefore at least 150+ meters in NLOS situations. We are considering to use Wireless M-BUS protocol or some similar which do not require acknowledgements from the sensor. We prefer sub 1-GHz radio because of coverage. Could you suggest some of your modules which support 150+ slaves in one network and extended range at least 150+ meters in urban area? Please also take into account our antenna limitations. “

[W-MBUS] “Regarding the modulation, I have a question about setting the modulation method. In my measurements , I changed the RF frequency with the volatile ‘C’ command. There is no volatile command to change the modulation method, so I left it at default. Then I find that the message transmission time at RF is the same for all channels, suggesting that the modulation scheme is the same. Is this the case, and is the default modulation valid for all channels? I need not be compatible with strict EN 13757. “

[W-MBUS] “in order to assess the SNR threshold of my RC1700HP-MBUS device, I’m mixing the signal from the 169 MHz gateway to the Meter with a white gaussian noise signal. In order to compute the actual received noise power, I should know the amplitude of any filter present in the receiving stage. According to the standard, channels 1a/b, 2a/b and 3a/b have a width of 12.5 kHz and therefore I’m simply supposing that a filter with a bandwidth approx. equal to 12.5 kHz will be present somewhere at the receiver. Could you please confirm my assumption? “

[W-MBUS] “I configured the MBUS radio to use the UART flow control using the CTS/RTS pins. When the host processor wants to send an MBUS message, it pulls the RTS pin low and waits for the radio to pull CTS up. The processor then sends the message. But this gives strange results, and sometimes it just fails to send the message. I also tried using only the CTS pin, where I wait for the pin to go high before sending the message. Again, this does not always work. Are the CTS/RTS pins exclusively for controlling the flow over the uart connection (host processor to radio) or are they meant to indicate when the radio can send another message ? If so, how should I use them ? “