L-MBUSxx User Manual
11
LOYTEC
Figure 4: Connecting the L-MBUSxx via RS-232 level UART interface Port 2.
When the L-MBUSxx is used with other M-Bus master devices other than the LOYTEC LINX or LROC devices
please make sure that the M-Bus master device will ignore received characters while it transmits M-Bus data
packets. The L-MBUS might send out valid or invalid characters on Port2 while it transmits M-Bus data packets
on the M-Bus port.
2.8.3 Wiring M-Bus network
Depending on the bitrate the following total length of network wiring is possible.
Bitrate
Total Wiring Length in [m]
300
< 12000 m
2400
< 4000 m
9600
< 1000 m
Table 4: M-Bus total wiring length.
Since the quiescent current of M-Bus devices generate a voltage drop along the M-Bus
cable the maximum distance from an M-Bus slave device to the L-MBUSxx is limited as
follows for a JYSTY nx2x0.8 cable.
Version 1.0
LOYTEC electronics GmbH