Communication Ports

The LTMT main unit has the following kinds of communication ports:

Modbus RTU Communication Port
PROFIBUS DP Communication Port

Modbus RTU Communication Port

The LTMT main unit with Modbus RTU communication is connected to the Modbus field terminals by using a 4-terminal connector.

Image	Terminals	Description
	D0	Data –
	D1	Data +
		Shielded earth

For more information on wiring and connections, refer to TeSys Tera Motor Management System Modbus RTU Communication Guide – DOCA0355EN

PROFIBUS DP Communication Port

The LTMT main unit with PROFIBUS DP communication can be connected in the PROFIBUS DP daisy chain using two different connectors. In the LTMT main unit, standard DB9 connector is used for conventional method for PROFIBUS DP network. It can be achieved, by looping terminal available for PROFIBUS DP connection.

The maximum data speed with the different connectors are mentioned below.

Image	Connector	Data speed
	D-type connector	12 Mbits/s
	Terminal connector	1.5 Mbits/s

The PROFIBUS DP 4-terminal connector has the following pin assignments:

Terminal	Signal	Description
A	RD-/TD-	Negative data transmission (RD-/ RD-)
B	RD+/TD+	Positive data transmission (RD+/ RD+)
	–	Shielded earth

For more information on wiring and connections, refer to TeSys Tera Motor Management System PROFIBUS DP Communication Guide – DOCA0256EN.