Z-World Wildcat BL2000, User Manual

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24 Wildcat (BL2000)
3.4.4 Ethernet Port
Figure 14 shows the pinout for the Ethernet port (J6). Note that there are two standards for
numbering the pins on this connector—the convention used here, and numbering in reverse
to that shown. Regardless of the numbering convention followed, the pin positions relative
to the spring tab position (located at the bottom of the RJ-45 jack in Figure 14) are always
absolute, and the RJ-45 connector will work properly with off-the-shelf Ethernet cables.
Figure 14. RJ-45 Ethernet Port Pinout
RJ-45 pinouts are sometimes numbered opposite to the way shown in Figure 14.
The transformer/connector assembly ground is connected to the BL2000 printed circuit
board digital ground via a 0
Ω
resistor “jumper,” R1, as shown in Figure 15.
Figure 15. Isolation Resistor R1
The factory default is for the 0
Ω
resistor “jumper” at R1 to be installed. In high-noise
environments, it may be useful to ground the transformer/connector assembly directly
through the chassis ground. This will be especially helpful to minimize ESD and/or EMI
problems. Once you have removed the 0
Ω
resistor “jumper,” R1, use a ring lug to attach
the BL2000 to the chassis ground, thereby grounding the transformer/connector assembly.
ETHERNET
RJ-45 Plug
1. E_Tx+
2. E_Tx–
3. E_Rx+
6. E_Rx–
1
8
RJ-45 Jack
J6
RJ-45 Ethernet Plug
R1
Chassis
Ground
Board
Ground