Omega WI8XX-U - Manual (Page 22)

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.
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.
16
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