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User Manual RelAir R2M · 07/2018 · VERSION 1.1
10
RELAIR R2M
a) Empty telegram
The gateway returns a telegram without data records if, after registering in the whitelist, no
telegram has been received from the registered meter:
RSP_UD: M-Bus empty telegram Example
La
y
er
Byte No. Name Content Bytes [hex]
1 Start Start-Byte 68h
Data
Li
nk
La
y
er (
DLL)
2 L-Field Telegram length 0Fh
3 L-Field Telegram length 0Fh
4 Start Start-Byte 68h
5 C-Field SND_UD 08h
6 A-Field Primary address (meter) 00h
7 CI-Field 72h (long Header) 72h
T
ran
s
po
rt L
ay
er (
T
P
L)
8 ID-Field Identification number LSB 00h
9 ID-Field Identification number 11h
10 ID-Field Identification number (meter ID) 22h
11 ID-Field Identification number MSB 33h
12 Manufacturer Manufacturer code LSB (Code = REL) ACh
13 Manufacturer Manufacturer code MSB 48h
14 Version Version B8h
15 Type Device type 07h
16 Acc. Access number 01h
17 State M-Bus State (e.g. error, alarm) 00h
18 Config. Configuration field (e.g. encryption) 00h
19 Config. Configuration field (e.g. encryption) 00h
20 Checksum 94h
DLL
21 Stop Stop-Byte 16h
Telegram
– M-Bus empty telegram