Elvaco CMeX50 - Cmex50 Optional Information Field

CMeX50 Users Manual English
CMeX50 Users Manual English
page | 49 (89)
2017-10-13
Document id: 1090055 Version 1.5
6.2.7 CMeX50 optional information field
The optional information field is included before the actual payload data received from the wireless M-
Bus slave. This data is used to give more information about the received telegram. The optional
information included depends on the DIF/VIF mode configured.
DIF/VIF mode
Description
Auto address
If the wireless M-Bus telegram is sent in a container on the wired M-Bus
interface, the current CMeX50 secondary address will be included.
If the wireless M-Bus telegram is not sent in a container, the current CMeX50
secondary address will not be included.
Address
The current CMeX50 secondary address will be included.
Address, Time
The current CMeX50 secondary address and the age of the received wireless
M-Bus telegram will be included.
Address, Time,
RSSI
The current CMeX50 secondary address, age and RSSI of the received wireless
M-Bus telegram will be included.
Table 10 DIF/VIF modes
CMeX50 Info
Description
Address
DIF = 0x0C (8 digit BCD)
VIF = 0x78 (Fabrication number)
Data = 0xnnnnnnnn
Where nnnnnnnn is the current secondary address in packed BCD of the
CMeX50 product.
Time
DIF = 0x02 (16 bit integer)
VIF = 0x75 (Actuality duration)
Data = 0xnnnn
Where nnnn is a 16 bit unsigned age in minutes of the received telegram.
RSSI
DIF = 0x01 (8 bit integer)
VIF = 0xFD (RSSI)
VIFE = 0x71 (RSSI)
Data = 0xnn
Where nn is the 8 bit signed RSSI calculated according to the following pattern:
Resulting range: -128 ... -6dbm
0xnn in the range 1..62:
2 x 0xnn-130 = Actual RSSI
0xnn = 0 (No RSSI)
0xnn = 1 (-128dBm)
0xnn = 63 (> -6dBm)
Table 11 CMeX50 info data description and coding