Pin Allocation Of The M-Bus Data Interface - Baer DLX User Manual

8.3.4

Pin allocation of the M-Bus data interface

With a passive M-Bus interface module the unit can be used in a M-Bus
system, as described in the standard TC 176/N17 Part 3:
•
Typical M-Bus voltage:
•
Max. M-Bus voltage:
•
Idle current:
•
Working current:
•
Baud rate:
•
M-Bus length:
•
Communication protocol: SCTM or IEC60870-5-102
•
Connection:
The distance between the DLX and the next M-Bus repeater unit can ex-
ceed 5 km. The maximum distance depends on the line conditions and the
current burden on the M-Bus. With sufficient line diameter, twisted lines and
limitations on the baud rate, up to double the value of the above mentioned
distance can be achieved.
Pin allocation at housing for panel mounting (Com2/X5 or Com1/X6)
and at 19"-rack (only Com2/X7):
Function
M-Bus
M-Bus
—
Bridge to 1
Bridge to 2
Baud rate: 300 to 2400 Baud (with good lines up to 9600 Baud)
The two M-Bus terminals 1 and 2 present twice and bridged internally
(with 4 and 5)
Pin allocation at 19"-rack (only Com1/X6):
Function
—
M-Bus
M-Bus
—
—
Baud rate: 300 to 9600 Baud
80
24V to 42V
50V
< 2mA
10 to 20mA
300 to 2400 Baud (with good lines up to 9600)
Note: up to 9600 Baud at 19"-rack (connector
X6)
max. 5km
(alternatively Modbus RTU)
via terminals
DLX (5 pins, male)
Pin No.
1
2
3
4
5
DLX (5 pins, male)
Pin No.
1
2
3
4
5