7SR210 & 7SR220 Installation Guide
Unrestricted ©2018 Siemens Protection Devices Limited
Page 21 of 36
Section 6: Data Comms Connections
6.1
Standard RS485 Connections
The standard RS485 communication port is located on terminal block 2 at the rear of the relay and can be
connected using a suitable RS485 120 Ohm screened twisted pair cable.
The RS485 electrical connection can be used in a single or multi-drop configuration. The RS485 master must
support and use the Auto Device Enable (ADE) feature.
The last device in the connection must be terminated correctly in accordance with the master driving the
connection. A terminating resistor is fitted in each relay, when required this is connected in circuit using an
external wire loop between terminals 18 and 20 of the power supply module.
Up to 64 relays can be connected to the RS485 bus.
The RS485 data communications link with a particular relay will be broken if the relay element is withdrawn from
the case, all other relays will still communicate.
Figure 6.1-1 RS485 Data Comms Connections Between Relays
6.2
IRIG-B Connections
A BNC plug is provided on the optional additional communication interface modules to connect a co-axial cable
carrying IRIG-B time synchronisation signals. Ensure that the stub length is minimised by connecting the tee-
connector directly to the rear of the relay. A suitable co-axial cable would be type RG58 50 Ohms.
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