83D01-051en202111 Manual TriBox3
TriBox3 // Annex
Modbus Server
1. Introduction
The TriBox3 Modbus server can be addressed either via Modbus/TCP using an IP connection or via Modbus/
RTU using a serial RS-485 or RS-232 connection. In both cases, the same addresses and register assignments
are used.
This document describes the specications of the Modbus implementation on the TriBox3. It is not a complete
Modbus documentation and it is assumed that the user is basically familiar with Modbus protocols.
2. Modbus/TCP
Modbus TCP can be used by any device that can establish a TCP connection to the TriBox3. By default, the
TriBox receives incoming Modbus connections on the standard port 502, but the port number can be changed
in the TriBox settings.
3. Modbus/RTU
Alternatively, each of the four sensor connections can also be used to operate connected Modbus clients. In this
case the protocol of the port must be changed to “Modbus server” (reboot the TriBox after the protocol settings
have been changed to “Modbus server”).
In contrast to other Modbus slaves, the TriBox can respond to several slave addresses, since each connected
sensor and the TriBox itself are handled like individual Modbus slaves with their own slave addresses.
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