{"id":6274,"date":"2025-08-04T14:03:27","date_gmt":"2025-08-04T13:03:27","guid":{"rendered":"https:\/\/www.marshflattsfarm.org.uk\/wordpress\/?page_id=6274"},"modified":"2025-08-04T20:39:36","modified_gmt":"2025-08-04T19:39:36","slug":"rayleigh-instruments-ri-d175-mb-meter","status":"publish","type":"page","link":"https:\/\/www.marshflattsfarm.org.uk\/wordpress\/?page_id=6274","title":{"rendered":"Rayleigh Instruments RI-D175-MB Meter"},"content":{"rendered":"\n

The RI-D175-MB<\/a> is the M-Bus interface variant of Rayleigh Instruments<\/a>‘ 45A direct-connect single phase energy meter. (Other variants offer only an S0 ‘pulse’ interface, or interface via Modbus rather than M-Bus.) It is a one-module wider meter with power terminals sized to accept cables up to 10.5mm2<\/sup>.<\/p>\n\n\n\n

Despite having an enclosure with the RI branding, this meter sends M-Bus telegrams which declare the Manufacturer to be PAD<\/code> (i.e. PadMess GmbH) instead of RAY<\/code> (or RIN<\/code>) which are the allocated Rayleigh Instruments manufacturer codes. These meters are all shipped with their Primary M-Bus address set to 1<\/code> but they respond as expected to the various configuration tools which allow a new Primary address to be specified.<\/p>\n\n\n\n

All instances of this meter model declare their ID (which is normally a serial number) to be 01000000<\/code> – and they do not<\/em> use this as their Secondary M-Bus address. They do<\/em> know about a ‘serial number’ – one is printed on a label attached to the side of the enclosure, and the same number is displayed on-screen (in two portions) at start-up and as the display cycles through all its parameters – but this appears to be ‘hidden’ from an M-Bus standpoint. Attempting to change the default ID using the Relay MBCONF<\/a> utility doesn’t result in an error message, but it has no effect. As a result, it seems these meters are not compatible<\/em> with meter management systems that rely on Secondary addressing.<\/p>\n\n\n\n

Given that the website for PadMess GmbH<\/a> says to refer to the website for Relay GmbH<\/a> it seemed like it might be possible that MBCONF would recognise this meter, but that’s not the case – MBCONF only offers the option to apply ‘generic’ EN1434 configuration settings (e.g. to change the Primary address).<\/p>\n\n\n\n

Using Primary addressing, these meters respond with the following M-Bus data points:<\/p>\n\n\n\n

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  1. Total Energy<\/li>\n\n\n\n
  2. Voltage<\/li>\n\n\n\n
  3. Amperage<\/li>\n\n\n\n
  4. (Active) Power<\/li>\n\n\n\n
  5. Power Factor<\/li>\n\n\n\n
  6. Frequency<\/li>\n\n\n\n
  7. Tariff 1 Energy\n