12
EN
COUNTIS E15 / E16 - 545 871 A - SOCOMEC
8. COMMUNICaTION
8.1. general information
In a standard coniguration, an M-BUS connection is used to connect 250* devices to a PC or a controller over a
distance of 1000 metres**.
* depending on the M-BUS capacity
** depending on the number of devices and the communication speed
M-BUS
M-BUS
N 1
N 1
N 2
N 1
N 2
N n
M-BUS cabling
Cabling with repeater
≈ 1000 m or 250 devices
≈ 1000 m or 250 devices
≈ 1000 m or 250 devices
Repeater
Repeater
Repeater
8.2. recommendations
Use a non-shielded JYSTY Nx2x0.8 mm twisted pair (0.5 mm²).
If the distance of 1000 m is exceeded and/or the number of devices is greater than 250, add a repeater to allow
additional devices to be connected.
If there are more than 250 units, use the secondary address only.
8.3. communication structure
The device communicates via an M-BUS protocol which involves a master/slave dialogue. The COUNTIS units (slaves)
are compatible with the 2 primary and secondary addressing modes. You can conigure the primary and secondary
addressing modes via the device's interface.
8.4. communication tables
The communication tables and relevant notes are available online
on the COUNTIS E15/E16 documentation page at:
www.socomec.com/en/countis-e1x
