Elvaco CMeX50 - M-Bus Commands; Initialize Slave (SND_NKE); Master to Slave; Slave to Master

CMeX50 Users Manual English
CMeX50 Users Manual English
page | 51 (89)
2017-10-13
Document id: 1090055 Version 1.5
6.3 M-Bus commands
6.3.1 Initialize slave (SND_NKE)
6.3.1.1 Master to slave
Byte index
Data
Description
0
0x10
Start character
1
0x40
C-Field = SND_NKE
2
0xnn
A-Field = Address of slave
3
0xnn
Checksum
4
0x16
Stop character
6.3.1.2 Slave to master
Byte index
Data
Description
0
0xe5
Acknowledge
6.3.2 Request user data (REQ_UD2)
Request user data from product or virtualized M-Bus slave and wait for slave response.
6.3.2.1 Master to slave
Byte index
Data
Description
0
0x10
Start character
1
0x4b | 0x5b | 0x6b | 0x7b
C-Field = REQ_UD2
2
0xnn
A-Field = Address of slave
3
0xnn
Checksum
4
0x16
Stop character
6.3.2.2 Slave to master (CMeX50 product addressed) – Telegram 1
The first telegram of the CMeX50 contains information and configuration of the product.
Values that are longer than one byte are always sent with least significant byte (LSByte) first. This also
applies to text strings that are sent ”backwards”. The only exception is the encryption keys that are sent in
the same order they are written and shown on the LCD-display.
Values formatted as ”packed BCD” are also sent with LSByte first, but MSNibble (bit 7..4) contains the
most significant of the two numbers in each byte.
Unless otherwise indicated, all numerical values are without signs, i.e. positive (unsigned).
Byte index
Data
Description
0
0x68
Start 1
1
0xnn
L-field 1