Chapter 4 - 7SR105 Rho · Data Communications Definitions
© 2018 Siemens Protection Devices Chapter 4 - Page 21 of 70
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 and RS485) where fitted. 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.
Definitions with shaded area are not available on all relay models.
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