LTMT Main Unit with EtherNet/IP Protocol

Overview

NOTICE
UNAUTHORIZED ETHERNET PORT USAGE Use only one Ethernet communication port at a time, even though both ports are functionally identical. Failure to follow these instructions can result in equipment damage.

The LTMT main unit with EtherNet/IP or Modbus TCP/IP communication protocol is equipped with two RJ45 Ethernet ports on the front face. These ports comply with IEEE 802.3 Ethernet standard.

The main physical characteristics of Ethernet ports are:

Physical Interface	Ethernet 10BASE-T/100BASE-T
Connector	RJ45

Description

A	Digital input connectors
B	RJ45 port for LTMT expansion module connection
C	RJ45 port for HMI connection
D	RJ45 ports for EtherNet/IP or Modbus TCP/IP communication
E	Device shield ground terminals
F	Temperature input connector
G	Power supply connector
H	QR code to product information page
I	Test/Reset button
J	Status LEDs
K	Digital output connectors

RJ45 Connector Pinout

The LTMT main unit is connected to the Ethernet network using either or both of the RJ45 Ethernet communication ports in compliance with the following wiring:

The RJ45 wiring layout is:

Pin No.	Signal	Pair	Description
1	TD+	A	Transmit +
2	TD-	A	Transmit –
3	RD+	B	Receive +
4	Do not connect	–	–
5	Do not connect	–	–
6	RD-	B	Receive –
7	Do not connect	–	–
8	Do not connect	–	–

Auto-MDIX Interface

Each RJ45 connector on the LTMT main unit Ethernet network port is an MDIX (media-dependent interface crossover) interface. Each connector automatically senses the:

Cable type (straight or crossed) plugged into the connector
Pin requirements of the device to which the LTMT main unit is connected

Using this information, each connector assigns transmit and receive functions to pin combinations 1 and 2, and 3 and 6 as necessary to communicate with the device on the other end of the cable.

NOTE: Auto-MDIX allows the use of shielded category 5E or higher straight-through twisted-pair Ethernet cables to connect the LTMT main unit to another device.