Installation Instructions

GAT NET.Lock 7020 System
Electrical Connections
www.gantner.com HB_GAT-NETLOCK7020--EN_12 41
4.4.2 Sub Controller Connection
The sub controllers are interconnected via the serial RS-485 interface. The same RS-485 interface is used to
connect the sub controllers to a GAT NET.Controller M 7020 master controller. RJ45 plugs are used for connecting
the RS-485 cables to the GAT NET.Controller S 7020. It is recommended to use at least CAT.5 (STP) cable for all
network connections.
For the RS-485 interface, it is important to differentiate between the IN and OUT sockets.
Figure 4.5 – RS-485 connection on the GAT NET.Controller S 7020
There are two options for connecting the sub controllers.
Option 1 – Series Connection
► Connect the incoming line (either from the master controller or the previous sub controller) to the “RS 485 IN”
socket.
► Connect the outgoing line (going to the next sub controller) to the “RS 485 OUT” socket.
NOTE! This is particularly important when the power supply is being forwarded on to the following sub
controllers (refer to “4.4.4 Power Supply Connection”).
Figure 4.6 – Series connection of the GAT NET.Controller S 7020
NOTE! Observe the following values for the number of connectable controllers per interface:
- GAT NET.Controller M 7020: max. 8 sub controllers per RS-485 line.
- GAT NET.Controller M 7020 Light: max. 3 sub controllers per RS-485 line.
- Max. cabling length per RS-485 line: 800 m (2624 ft).