ProSoft Technology MVI56E-MNET/MNETXT - Manual (Page 136)

Reference MVI56E-MNET / MNETXT ♦ ControlLogix Platform
User Manual Modbus TCP/IP Interface Module
Page 136 of 181 ProSoft Technology, Inc.
April 23, 2014
5.4 Ethernet Cable Specifications
The recommended cable is Category 5 or better. A Category 5 cable has four
twisted pairs of wires, which are color-coded and cannot be swapped. The
module uses only two of the four pairs.
The Ethernet ports on the module are Auto-Sensing. You can use either a
standard Ethernet straight-through cable or a crossover cable when connecting
the module to an Ethernet hub, a 10/100 Base-T Ethernet switch, or directly to a
PC. The module will detect the cable type and use the appropriate pins to send
and receive Ethernet signals.
Ethernet cabling is like U.S. telephone cables, except that it has eight
conductors. Some hubs have one input that can accept either a straight-through
or crossover cable, depending on a switch position. In this case, you must ensure
that the switch position and cable type agree.
Refer to Ethernet cable configuration (page 136) for a diagram of how to
configure Ethernet cable.
5.4.1 Ethernet Cable Configuration
Note: The standard connector view shown is color-coded for a straight-through cable.
Crossover cable Straight- through cable
RJ-45 PIN RJ-45 PIN
1 Rx+ 3 Tx+
2 Rx- 6 Tx-
3 Tx+ 1 Rx+
6 Tx- 2 Rx-
RJ-45 PIN RJ-45 PIN
1 Rx+ 1 Tx+
2 Rx- 2 Tx-
3 Tx+ 3 Rx+
6 Tx- 6 Rx-