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Chapter 4) 7SR158 - Data Communications
4. MODBUS Definitions
4.1 Introduction
This section describes the MODBUS-RTU protocol implementation in the relays. This protocol is used for
communication with a suitable control system.
This protocol can be set to use any or all of the relays hardware interfaces (USB, Fibre Optic, RS232 and RS485).
The relay can communicate simultaneously on all ports regardless of protocol used.
The Station Address of the port being used must be set to a suitable address within the range 1 - 247 to enable
communication. This can be set by the Communications Menu : COM n-xxxxx Station Address setting.
Communication via MODBUS over Ethernet requires external devices. Please refer to the documents TCPIP
Catalogue Sheet and TCPIP Interface Technical Guidance Notes for more information.
Definitions with shaded area are not available on all relay models.
© 2013 Siemens Protection Devices Limited
Chapter 4 - Page 21 of 66
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