socomec COUNTIS E45 - 8 Communication; General Information; Recommendations; Communication Structure

13
EN
COUNTIS E45/E46 - 547983A - SOCOMEC
8. COMMUNICATION
8.1. General information
In a standard conguration, an M-Bus connection is used to connect 250* devices to a PC or a controller over a distance of
1000 meters.
* depending on the M-BUS capacity
** depending on the number of devices and the communication speed
M-BUS
M-BUS
N 1N 1
N 2
N 1 N
2N
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 dialogue in accordance with a master/slave structure. The
COUNTIS units (slaves) are compatible with the 2 primary and secondary addressing modes. You can congure the primary
and secondary addressing modes via the device's interface.
8.4. Communication tables
The communication tables and relevant notes are available on the COUNTIS E45/E46
documentation page on the website at the following address:
www.socomec.com/en/countis-e4x