Siemeca AMR ™ Network Node WTT16/WTX16 M-Bus ... - Armatec AB

Example:
RSP_UD: 42 7A 23 01 07 79 78 56 34 12 65 32 14 0E 0C 78 32 54
76 98
Memory block #1 (DIF = 42)
Memory position
291 (123h)
Device ID 12345678
Manufacturer ID
LSE (3265h)
Version
20 (14h)
Medium
14 (0Eh)
In the response, too, the lowest-value byte is transmitted first (LSB
first).
If the memory location is not used or if the memory location number
selected is invalid, only a shortened response will come up:
RSP_UD #1:
42 7A mp mp
RSP_UD #2:
82 01 7A mp mp
mp mp queried memory location number (memory position) –
(16-bit binary value (unsigned integer))
Search Run und
Readout of an M-
bus with Network
Node
Search Run of
Primary-address
Devices
In order for an M-bus master to communicate with an M-bus slave,
the master must know the address of the device. To this end, it must
learn in all the available devices on the M-bus when it is first started.
The master uses different approaches for primary-address and
secondary-address devices.
A total 251 M-bus slaves may be connected to an M-bus line.
1. Accessing test address 254 with SND_NKE
a. If no response has been received within the
maximum response delay, there are no devices on
the M-bus. (The master should repeat the test.)
b. If exactly one CONFIRM has been received within
the maximum response delay, there is only one
device on the M-bus. The master sends an
REQ_UD2 to read out the device data.
36/56 For intra-company use only
Siemens
Netzwerkknoten WTT16/WTX16
Building Technologies The Network Node 09.03.2007