Keep Alive Frame - ADEUNIS WMBUS TEMP Guide D'utilisateur

WMBUS TEMP - Guide utilisateur / User guide version V2.0.0

4.2.4 Keep Alive frame

This frame (0x30) is transmitted only in the event mode at the frequency defined by register 300. It contains the same fields as the data frame
(0x43):
0 1
Code Status
internal
0x30 Cf Status sensor
identifier
0x30 0xA2 0xD1
Description of the frame:
• Byte 2:
o Bits 0 to 3:
0: unknown/absent/error
1: CTN internal sensor B57863S0321F040
o Bits 4 to 7: The user identifier defined in register 320
• Bytes 3 to 4: Value measured on the internal sensor
• Signed value on 16 bits,
• Expressed in tenths of degrees,
• Most Significant Byte first
• The special value 0x8000, equivalent to -3276, 8°C is returned in the event of a fault in the sensor.
• Byte 5:
o Bits 0 to 3:
0: unknown/absent/error
1: unknown
2: CTN external sensor FANB57863-400-1
o Bits 4 to 7: The user identifier defined in register 322
• Bytes 6 to 7: Value measured on the internal sensor
• Signed value on 16 bits,
• Expressed in tenths of degrees,
• Most Significant Byte first
• The special value 0x8000, equivalent to -3276, 8°C is returned in the event of a fault in the sensor.
In the example in grey this gives:
• Byte 2=0xD1:
o Bits 0 to 3 = 0x1: The internal sensor is present
o Bits 4 à 7 = 0xD: the identifier of the internal sensor defined by the user is equal to 0xD
• Bytes 3 to 4=0x015E: The value measured on the internal sensor is 350/10=35°C
• Byte 5=0x82:
o Bits 0 to 3 = 0x2: The external sensor is of the type external CTN sensor FANB57863-400-1
o Bits 4 to 7 = 0x8: the identifier of the internal sensor defined by the user is equal to 0x8
• Bytes 6 to 7=0xFF06: as this field is signed the hexadecimal value 0xFF06 = -250. Hence the value measured on the external sensor is
-250/10=-25°C
2 3 4
Value read on the
internal sensor
0x015E
5 6 7
PAYLOAD
external
Value read on the
sensor
internal sensor
identifier
0x82 0xFF06
8 9 10
X
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