BS/EN 13757-4-2019 pdf download.Communication svstems for meters Part 4 : Wireless M-Bus communication.
12.5.5 Manufacturer ID (M-fleld)
The third and the fourth byte of the first block shall contain a unique User/Manufacturer ID of the sender. The 15 least significant bits of these two bytes shall be formed from a three letter ISO/IEC 646 code (A … Z) as specified in EN 13757-7:2018, 7.5.2.
lithe most significant bit of these two bytes User/Manufacturer ID is equal to zero, then the address A shall be a unique (hard coded) manufacturer meter address of 6 bytes. Each manufacturer is responsible for the worldwide uniqueness of these 6 bytes. Any type of coding or numbering, including type/version/date may be used as long as the ID is unique.
If the most significant bit of this two-byte User/Manufacturer ID is different from zero, then the 6 byte address shall be unique at least within the maximum transmission range of the system (soft address). This address is usually assigned to the device at installation time. As long as these unique address requirements are fulfilled, the remaining bytes may be used for user specific purposes.
NOTE The address Is used in the back office to identify the meter independently of Its communication interface. Therefore the manufacturer needs to ensure a uniqueness of the addresses not only for wireless meters hut for all produced meters.
12.5.6 Address (A-field)
This address field A contains, in deviation to EN 6OH7U-5-, always the address of the sender. At uphnk — the address of a Meter with integrated radio module or the address of a radio adapter supporting a Meter without a radio module and at downlink the address of the Other Device. The address of the receiver (required for the downlink) shall follow in the Extended Data Link Layer, see lIZ. or in the Transport Layer, see 113. The address shall be unique, see 12.5.5. Each User/Manufacturer shall guarantee that this address is unique. If this protocol Is used together with the Transport Layer or the Application Layer of EN 13757-3 then the following Address structure shall be applied: the A-field shall be generated as a concatenation of the ‘Identification number’, ‘Version number’ and ‘Device type information’ as specified In EN 13757-7:2018. 7.5.1, 7.5.3 and 7.5.4, refer to examples in Annex C.
NOTE If the meter address differs from the sender address, the meter address will be transmitted after the Cl-field using a long Transport Layer see 133=3 and EN 13757-7.
The first byte of the second block is the Cl-field. The Cl-field specifies the type of protocol and thus the nature of the information that follows. The Cl-field may declare an Application Layer. an Authentication and Fragmentation Layer, a Transport Layer, a Network Layer or an Extended Link Layer. The Cl-field is defined In 131.
12.6 Timing
12.6.1 Timing for installation messages
A Meter may support additional installation messages. The installation messages shall be started only with a manual event (e.g. by pressing a button). The transmission of installation messages shall start immediately after this event.
For an efficient commissioning the installation messages (SND-IR) shall be repeated at least 6 times with an interval of 30 s to 60 s. The transmission of installation messages shall stop no later than 60 mm after the manual start event.
lithe Other Device receives an installation message (SND-lR) and registers this Meter finally for permanent reception, it should respond with a Confirm Installation Message (CNF-IR) to signal the successful registration to the Meter Itself and to an optionally service tool. If the Meter receives this message, it may stop the repetition of installation messages. The service tool may use this message to give a feedback to the service technician, about the successful meter installation.
lithe Other Device receives an installation message (SND-IR) it may generate a feedback message (SND-NKE) to a service tool. To avoid collisions with a second Other Device the transmission of the feedback message (SND-NKE) shall be randomly delayed between S s and 25 s after the reception of the Meter installation message. The transmission of the feedback message (SND-NKE) is independent rrom the transmission or reception of a Confirm Installation Message (CNF-IR). Refer to CEN/1R171672018 Annex D.
12.6.2 Synchronous transmissions of meter messages
In order to enable battery efficient Other Device’s (data wniinLrator, npcaters, etc.) that only switch on their receivers for predicted short time windows, the Meter should follow a strict transmission time scheme. The use of the synchronous transmission scheme is optional.
The Meter shall transmit synchronous messages at least with a nominal (I.e. average) transmission interval given by Table.3b.
The synchronous messages shall be of the type SND-NR. ACC-DMD or ACC-NR (C-fields 44h. 48h or 47h). They shall contain a short or long header or a Cl-field in the range 86h or HCh to 8Fh (Tab1i42) because the access number is required. ACC-NR messages may be used just to maintain synchronization. SNDNR. ACC-DMD and ACC-NR messages may be mixed.BS/EN 13757-4-2019 pdf download.