Elvaco CMeX50 - Select Slave; Master to Slave

CMeX50 Users Manual English
CMeX50 Users Manual English
page | 67 (89)
2017-10-13
Document id: 1090055 Version 1.5
6.3.14 Select slave
Select slave for further secondary addressing. After successful selection, the slave can be addressed using
primary address 253.
6.3.14.1 Master to slave
Byte index
Data
Description
0
0x68
Start character 1
1
0xnn
L-Field 1
Variable depending on selection mask.
The selection mask can have any size in the range
0..8 bytes except 5 (manufacturer id requires a full
16-bit mask).
2
0xnn
L-Field 2
Variable depending on selection mask
3
0x68
Start character 2
4
0x43 | 0x53 | 0x63 | 0x73
C-Field = SND_UD
5
0xnn
A-Field = Address of slave
6
0x52
CI-Field = Slave selection
The slave will be deselected if there is any
mismatch.
7-10
0xnnnnnnnn
Optional
M-Bus secondary address mask, packed BCD
The M-Bus ID mask can use the nibble 0xf as a
wildcard in any of the eight BCD digit positions.
11-12
0xnnnn
Optional
M-Bus manufacturer id mask, 16-bit binary
The M-Bus manufacturer id mask can use 0xff as
wildcard for one or both bytes.
13
0xnn
Optional
M-Bus generation mask, 8-bit binary
The M-Bus generation mask can use 0xff as
wildcard.
14
0xnn
Optional
M-Bus medium mask, 8-bit binary
The M-Bus meter medium mask will match if 0x00
("unknown") or 0xff (wildcard).
15
0x0c
Optional
DIF 8 digit packet BCD