Omega WI8XX-U manual Network Communication Interfaces, 2.2.1 10Base-T RJ-45 Pinout, 12 RJ45 Pinout

2.2 Network Communication Interfaces
2.2.1 10Base-T RJ-45 Pinout
The 10BASE-T Ethernet network (RJ-45) system is used in the Meter for
network connectivity. The 10 Mbps twisted-pair Ethernet system operates over
two pairs of wires. One pair is used for receiving data signals and the other pair
is used for transmitting data signals. This means that four pins of the eight-pin
connector are used.	Pin	Name	Description
	1	+Tx	+ Transmit Data
	2	-Tx	- Transmit Data
	3	+RX	+ Receive Data
	4	N/C	Not Connected
	5	N/C	Not Connected
	6	-Rx	- Receive Data
	7	N/C	Not Connected
	8	N/C	Not Connected
	Figure 2.12 RJ45 Pinout

2.2.2 10Base-T Crossover Wiring

When connecting the iServer directly to the computer, the transmit data pins of the computer should be wired to the receive data pins of the Meter, and vice versa. The 10Base-T crossover cable with pin connection assignments are shown below.

Figure 2.13 10Base-T Crossover Cable Wiring

Use straight through cable for connecting the Meter to an Ethernet hub. The ports on the hub are already crossed.

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