24
GB
6795773_01
This type of connection is made between the thermostat of
a Master unit and that of the next Slave unit (if present). The
thermostats used as Master or Slave can be:
• VMF-E0 (usable as Master only if a supervision system with
VMF-E5 is not foreseen);
• VMF-E1;
• VMF-E18 (only for inverter units);
• VMF-FCL (only for FCL units).
The electric connection between a MASTER thermostat
and the next SLAVE must be implemented by using a cable
having the following features:
• Shielded cable AWG 22 - 3 (0.34mm
2
- 2 poles);
• Maximum length of the connection (by maximum length we
mean the distance of the LAST Slave from the Master) 30m.
For detailed information on the connection between
the thermostat board and control interface, refer to the
specifi c documentation of the accessories.
(2) TTL connections between MASTER and SLAVE
This type of connection is made between:
• The chiller board (if supplied with relative accessory for
RS485 communication);
• Accessory VMF-CRP modules (if foreseen);
• VMF-ACS electric control board for production of domestic
hot water (if foreseen);
• All thermostats of the Master units (VMF-E1, VMF-E18,
VMF-FCL).
The RS485 interface standard guarantees safe data
transmission with high disturbance immunity at long
distances (max 1000 m) between components of the system.
Data transmission is differential:
• T+ (terminal 1-A of connector CN11 of VMF-E5 panel);
• T- (terminal 2-B of connector CN11 of VMF-E5 panel);
• GND (terminal 3-GND of connector CN11 of VMF-E5 panel).
For proper communication, the RS485 bus must respect the
type of connection carried below:
(3) Main RS485 connection for communication between system and centralised control elements
For detailed information on the connection between
the thermostat board and control interface, refer to the
specifi c documentation of the accessories.
Point-point type;
(CORRECT type)
Star type;
(Type NOT ALLOWED)
Loop type;
(Type NOT ALLOWED)
Bus type;
(Type NOT ALLOWED)
To Next Page
Loading...
Need help?
General
