Hello all, this is a re-write with a better title of my German post which I unfortunately cannot edit anymore. I need to read data from an ABB "B23 111-101" meter which is accessible via an IR-interface on its left side. This IR-interface is configured to M-Bus, 2400 Bd & Address 9 (arbitrary number). For reading from that IF I am using an IR Read-/Write Head from Weidmann Elektronik which incorporates an FDTI chip and the IR TX/RX components and interfaces to the RPI via USB. The IR-head works, I could try that out on a smart-meter with the metal-ringed LED-eye on its front. However, when trying to read from the ABB-meter I get no reaction at all from the ABB-component. The RPI would have the libmbus-library from rscada (https://github.com/rscada/libmbus) for doing the M-Bus interface. Installation went well and if I try sending against a white sheet of paper I can "read" the reflected TX-signal. As no reactions came from the ABB-meter I am now already down to working on a laptop with a terminal, sending out the data directly. Current trial, sending of the RWG_UD2-telegram for reading from the meter: 0x10, 0x5B, 0x09, 0x64, 0x16 0x10 = Start 0x5B = REQ_UD2 0x09 = Adress 0x64 = Checksum (=0x5b + 0x09) 0x16 = Ende Reaction from the meter: none. Again: sending against a white sheet of paper I see the reflected IR-data being displayed in the terminal. Any idea about what may be going wrong here? Do I need any kind of wake-up sequence? I didn't find anything on the looking at the protocol. Also as a side-note: anyone any info how the TX- and RX-"LED"s are aligned in the meter? TX=Top, RX= Bottom or vice-versa? Thanks a lot & cheers Moadl
You can check the allignment of the LEDs with a Digitalcamera (usally smartphone cam is good enough). Send data and watch the leds trough the cam (put on video mode). You should see a "flickering" light as the cam can see the infrared signal. The LED flickering is the TX Led, the other must be RX then. I use this to check if remote controls are working or not :-) .... As i also have s smartmeter (from electricity company) mymust be enabled first by sending a "blink code" to the device. Unfortanlty i didn´t get the code for my meter. But the guy that came to read it out has the code and activted it for me. Now i can read it out but he already told me that the activation must be redone after some days. So it will not last for long. I use the data for my smarthome (as the meter has no other interface).
Hello Armin, yes, the smart-phone video is something that i also do pretty frequently. 8o) On the IR-head I also see where the data is coming out. However as Murphy is also in the game, the meter is installed in a cabinet where one would need a rubber-mobile to get in both with the IR-head and the mobile. From these tries I could see that my TX-head is blinking into the ABB-meter, however I cannot see anything coming back. Whether this is down to the meter not reacting or me not being able to see it with the mobile is something that I cannot guarantee. My guess is the meter keeps silent. The ABB-meter was purchased freely from authorised whole-sale and not from any electricity company. The normal ACE...-meters are reacting properly when "talking" to them... 8o( Cheers Moadl
Hello all, as usual on "nothing works" it was just a small item. The imporant bit on the communication is the parity. The M-Bus IR-interface on the ABB B23 requires: - certain baud-rate (can be selected in meter) - address (can be set in meter) - 8 Data-Bits - Even parity (!) - 1 Stop-Bit If that is correctly set then it replies to the interface. Also for completeness, the RX-side on the meter is on the bottom of the IF, the TX-side on the top. Cheers Moadl
Hello Moadl, you made my day. Had exactly the same problem. Adding Parity bit with even polarity solved the topic. Thanks for postint your solution, Oliver