101-0445 Rabbit Semiconductor, 101-0445 Datasheet - Page 36
101-0445
Manufacturer Part Number
101-0445
Description
CARD D/A 4-20MA SR9420 SMARTSTAR
Manufacturer
Rabbit Semiconductor
Datasheet
1.101-0437.pdf
(184 pages)
Specifications of 101-0445
Accessory Type
Smart Star D/A Card
For Use With/related Products
SR9420
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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3.2.1.4 Ethernet Port (SR9150 only)
Figure 13 shows the pinout for the Ethernet port (J2 on the CPU Card). 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 13) are always absolute, and the RJ-45 connector will work properly with off-
the-shelf Ethernet cables.
ETHERNET
Figure 13. RJ-45 Ethernet Port Pinout
RJ-45 pinouts are sometimes numbered opposite to the way shown in Figure 13.
Two LEDs are placed behind the RJ-45 Ethernet jack, one to indicate an Ethernet link
(
LNK
) and one to indicate Ethernet activity (
ACT
). Only the CPU LEDs are functional at
this time since the RCM LEDs were added for future enhancements to the CPU Card.
The transformer/connector assembly ground is connected to the CPU Card digital ground
via a 0 Ω resistor “jumper,” R43, as shown in Figure 14.
Figure 14. Isolation Resistor R43
The factory default is for the 0 Ω resistor “jumper” at R43 to be installed. In high-noise
environments, remove R43 and ground the transformer/connector assembly directly
through the chassis ground. This will be especially helpful to minimize ESD and/or EMI
problems.
36
Smart Star (SR9000)
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