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Alternative converters are the Reyrolle Dual RS232 Port (Sigma 3) or Reyrolle Passive Fibre-Optic Hub
(Sigma 1).
1.
The Sigma 3 Dual RS232 port provides a fibre-optic interface to a relay and two RS232 ports.
The RS232 system port is typically connected to a control system while the second port is a local
port. When the local port is in use the system port is automatically disabled. The Sigma 3 has an
internal link to switch between line idle Light ON or Light OFF. The default configuration is Light
OFF.
2.
The Sigma 1 Passive Fibre-Optic Hub provides fibre-optic interfaces for up to 29 relays. It has a
fibre-optic port to the control system and multiple relay connections. Each of the 30 fibre-optic
ports can be configured for either Light ON or Light OFF operation. Default for all is OFF.
2.6. Parity Setting
IEC 870-5-103 defines the method of transmission as using EVEN Parity. However, in some instances an
alternative may be required. This option allows the parity to be set to NONE.
2.7. Address Setting
The address of the relay must be set to a value between 1 and 254 inclusive before any
communication can take place. Setting the address to zero disables communications to the relay,
although if it is in an optical ring it will still obey the Data Echo setting. All relays in an optical ring must
have a unique address. Address 255 is reserved as a global broadcast address.
©2010 Siemens Protection Devices Limited
7SG11 Argus 8 Communication Interface
Chapter 4 Page 4 of 8
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