Danfoss Sonometer 40 Wired M-bus Protocol Description Instruction Manual

Danfoss SonoMeter 40 Wired M-Bus Protocol Description

General structure of protocol

General features of protocol

• Meter uses an M-bus protocol.
• Default baud rate: 2400 bps, Even, 1 Stop.
• The Baud rate can be changed.
• The protocol is the same for the Mbus interface and for the optical interface.
• The primary address of Mbus is individual for the Mbus interface and for the optical interface.

Data strings

Data string to meter SND_NKE:

• A – M-bus primary address of meter
• CS – control sum (the youngest byte of amount of 2-nd and 3-rd bytes)

Data string to meter SND_UD2

• L – length of string (the number of bytes from 5-th to n-2 byte)
• A – M-bus primary address of meter
• CS – control sum (the youngest byte of the amount of 5-th to n-2 bytes)

Data string to meter REQ_UD2:

• A – M-bus primary address of the meter
• CS – control sum (the youngest byte of the amount of 2-nd and 3-rd bytes)

The answer of the meter CON:

• E5h

Answer of the meter RSP_UD2:

• L – length of string (the number of bytes from 5-th to n-2 byte)
• C – „C field“ (08)
• A – M-bus primary address of the meter
• CI – „CI field“
• ID – identification number of a meter (BSD8, used for secondary addressing, can be changed – see paragraph 4.1),
• Man – Manufacturer code (Danfoss A/S manufacturer code is „DFS“, 10 D3)
• Vrs – number of protocol versions (0Bh)
• Md – code of medium (for „heat / cold energy“: 0Dh)
• TC – counter of telegrams
• St – meter status code
• Sign – 00 00
• The bytes 20…n-2 is data from the meter:
  • DIF – code of data format
  • VIF – code of data units
  • Data– values of data
• CS – control sum (the youngest byte of the amount of 5-th to n-2 bytes).

Selection of the data type

Master sends to the meter telegram SND_UD2:

Selection of the data type “All data”

Answer of the meter CON (if A not equal FFh):

• E5h

Selection of the data type “User data”
Master sends to the meter telegram SND_UD2:

Answer of the meter CON (if A not equal FFh):

• E5h

Selection of the data type “Simple billing” (Years logger)
Master sends to the meter telegram SND_UD2:

Answer of the meter CON (if A not equal FFh):

• E5h

Selection of the data type “Enhanced billing” (Days logger)
Master sends to the meter telegram SND_UD2:

Answer of the meter CON (if A not equal FFh):

• E5h

Selection of the data type “Multi tariff billing” (Months logger)
Master sends to the meter telegram SND_UD2:

Answer of the meter CON (if A not equal FFh):

• E5h

Selection of the data type “Instantaneous values”
Master sends to the meter telegram SND_UD2:

Answer of the meter CON (if A not equal FFh):

• E5h

Selection of the data type “Load management values for management” (Hours logger)
Master sends to the meter telegram SND_UD2:

Answer of the meter CON (if A not equal FFh):

• E5h

Selection of the data type “Installation and startup”
Master sends to the meter telegram SND_UD2:

Answer of the meter CON (if A not equal FFh):

• E5h

Master sends to the meter telegram SND_UD2:

Selection of the data type “Testing”
Answer of the meter CON (if A not equal FFh):

• E5h

The parameter list for preselecting

If not satisfied with Default parameter lists (presented in tables 1 … 9). Obtain the desired parameter list presented in Table 11th.
(Paragraph 2.1 … 2.9) Additionally it is needed to send the parameter selecting telegram SND_UD2:

• SEL selecting parameter code from the table of 11 (made out of sequence as many codes as you want to select of the parameters).

Note: It may be selected as many parameters but the Response telegram length can not exceed 250 bytes

Answer of the meter CON (if A not equal FFh):

• E5h

Data request

Master sends to the meter telegram SND_UD2:

Data request
In all cases, except A = FFh, meter response RSP_UD2 telegram with selected data (tables 1 …9) If no data record, the answer of meter is CON:

• E5h

Application reset sub-codes and storages: All data (CI = 50 or CI = 50 00)

Default list

x = B – for energy for heating, x = C – for energy for cooling.

Meter data coding

Application reset sub-codes and storages: User data (CI = 50 10)

Default list

Application reset sub-codes and storages: Simple billing (Years logger) (CI = 50 20)

Default list

x = B – for energy for heating, x = C – for energy for cooling

Application reset sub-codes and storages: Enhanced billing (Days logger) (CI = 50 30)

Default list

x = B – for energy for heating, x = C – for energy for cooling.

Application reset sub-codes and storages: Multi tariff billing (Months logger) (CI = 50 40)

Default list

x = B – for energy for heating, x = C – for energy for cooling

Remark
If meter is specially configured, in table 5 listed monthly parameters data is transmitted and in accordance after inquiry (“All data” table 1) data transmission.

Application reset sub-codes and storages: Instantaneous values (CI = 50 50)

Default list

x = B – for energy for heating, x = C – for energy for cooling

Application reset sub-codes and storages: Load management values for management (Hours logger) (CI = 50 60)

Default list

x = B – for energy for heating, x = C – for energy for cooling

Default list

Application reset sub-codes and storages: Testing (CI = 50 90)

Default list

Error code encryption

Parameters list for preselecting

x = B – for energy for heating, x = C – for energy for cooling.

Remarks:

1. Table 1…11 energy and volume DIF VIF codes are provided of comma position for 0,001 MWh, 0,001 GJ, 0,001 Gcal, and 0,001 m3. Other values can be set for energy and volume.
2. Table 1…11 parameters marked “*”, will be transmitted only if the conditions are kept:

CRC16 checksum calculation algorithm

• The polynomial x^0 + x^5 + x^12.
• const __u16 crc_ccitt_table[256] = {
  • 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
  • 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff,
  • 0xe876, 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e,
  • 0x54b5, 0x453c, 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868,
  • 0x99e1, 0xab7a, 0xbaf3, 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 0x6306, 0x728f, 0x4014, 0x519d,
  • 0x2522, 0x34ab, 0x0630, 0x17b9, 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 0xffcf, 0xee46, 0xdcdd,
  • 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 0x9489, 0x8500,
  • 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 0x2942,
  • 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
  • 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb,
  • 0xa232, 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb,
  • 0x0e70, 0x1ff9, 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78.
• crc_ccitt – recompute the CRC for the data buffer
• @crc – previous CRC value
• @buffer – data pointer
• @len – number of bytes in the buffer
• u16 crc_ccitt(__u16 crc, __u8 const *buffer, size_t len){ while (len–)
• crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ (*buffer++)) & 0xff]; return crc;

Settings the parameters of meter

Master sends to the meter string SND_UD2 with new identification number „ID“ (BCD8 format):

Changing the identification number

Answer of the meter CON (if A not equal FFh):

• E5h

Changing the identification number, Manufacturer ID and Medium
Master sends to the meter string SND_UD2 with new Complete ID (64 bit integer):

Answer of the meter CON (if A not equal FFh):

• E5h

Structure of “Complete ID” (64 bit integer):

Remark: Generation code is ignored (In meter Generation code is fixed 0Bh)

Changing the primary address

Master sends to the meter string SND_UD2 with new primary address „aa“:

Answer of the meter CON (if A not equal FFh):

• E5h

Changing the data and time of the meter
Master sends to the meter string SND_UD2 with new primary address „aa“:

Answer of the meter CON (if A not equal FFh):

• E5h

Changing the yearly set day
Master sends to the meter string SND_UD2 with new set data:

Answer of the meter CON (if A not equal FFh):

• E5h

Changing the monthly set day
Master sends to the meter string SND_UD2 with new set data:

Answer of the meter CON (if A not equal FFh):

• E5h

Remark: Changing the identification number and the set date is possible only when meter is set to SERVICE mode.

Changing the baud rate
Master sends to the meter string SND_UD2 with new baud rate code „BR“:

Answer of the meter CON (if A not equal FFh) with old baud rate:

• E5h

Values of BR code:

• BR=B8h – for changing boud rate to 300 bps
• BR=B9h – for changing boud rate to 600 bps
• BR=BAh – for changing boud rate to 1200 bps
• BR=BBh – for changing boud rate to 2400 bps
• BR=BCh – for changing boud rate to 4800 bps
• BR=BDh – for changing boud rate to 9600 bps

Secondary addressing

Master sends to the meter string SND_UD2:

Selecting of the meter

• NN – Identification number (secondary adress) BCD8 format (if „F“- this number ignored)
• HH – Manufacturer code, HST format (if „FF“- this byte ignored)
• ID – Identification code, HST format (if „FF“- ignored)
• MM – Medium code, SMED format (if „FF“- ignored)

The meter, whose identification number is the same, is selected for further communication and sends an answer CON:

• E5h

Communication with selected meter

Communication with selected meter carried out as usual:

• the data type for reading is selected by sending to meter strig SND_UD2 (see paragraph 2), only in this case, the M-bus address must be FDh,
• the answer of the selected meter CON:
  • E5h

for data request master sends to the meter string (M-bus address must be FDh):

• meter response RSP_UD2 telegram with selected data (tables 1 …9)

Deselection of secondary addressing mode
Master sends to the meter telegram SND_NKE with adress FDh:

Danfoss A/S
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