Send Modbus ® Commands; M-Bus Req_Ud2 Answers - Badger Meter ModMAG M2000 User Manual

M-Bus addressing
Please note that writing to the configuration area is under any circumstances
limited to 20 times per 24 hours. Even with the above mentioned command it is
not possible to write more often.
4.8 Send ModBus
Since not all of the ModBus
using "native" M-Bus commands, it is also possible to encapsulate "native"
ModBus
ModBus
and 0x10, register reading and writing) with a M-Bus interface too.
Request (values in hex):
68 LL LL 68 73/53 PAddr 51 0F [ModBus] ChkS 16
send ModBus
LL: Length byte of M-Bus telegram
[ModBus]: ModBus
e.g.:
68 0A 0A 68 73/53 PAddr 51 0F 01 03 00 43 00 05 ChkS 16
The underlined part is the ModBus
(5 registers) of the ModMAG
Answer (values in hex):
68 LL LL 68 08 PAddr 72 SecAddr AccessCtr Status Signature
0F [ModBus] ChkS 16
e.g.:
68 1D 1D 68 08 00 72 95 09 10
19 A9 09 01 07 08 01 00 00 Header for M-Bus RSP_UD
0F Flag: manufacturer specific
01 03 0A 31 39 31 30 30 39 39 35 00 00 ModBus
ChkS 16
Please note however, that in case of using the encapsulated ModBus
commands, the M-Bus communication timeout should be increased (e.g. from
50 ms to 400 ms), since the requested registers are directly read and the
results are returned within the answer to the request.
Please note also that these commands are compatible with M-Bus physical and
link layers, but not completely compatible with the application layer. Therefore,
all standard M-Bus communication lines will transmit the command, however,
the software on the application side must be able to understand and interpret
the command.
4.9

M-Bus REQ_UD2 answers

As mentioned before, the module may answer a REQ_UD2 data request by five
different RSP_UD answers according to its configuration:
All:
Instantaneous: Contains a short form of "All" with only the volumes, flow rate
Testing:
® commands
®
® commands within a M-Bus command. It is then possible to use all the
commands understood by the ModMAG
®
® command
command without CRC
®
®
Contains the volumes, flow rate, flow speed, flow direction, etc.
and flow direction (smaller telegram = faster reading)
Contains the meter diagnostic counters of the ModMAG
M2000
MID_M2000_BA_MB_02_1805
registers of the ModMAG
® command for reading the address 0x0043
M2000.
Page 8/14
® M2000 are retrievable
M2000 (0x03, 0x04, 0x06
®
answer
®
®
®