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17 Chapter 2
2.3.7 Termination Resistor (JP6)
The onboard termination
resistor
(120
ohm) for COM3/COM4 can be
used for long distance
transmission
or device
matching (Default
Open).
Close: Enable termination resistor.
2.4 LAN: Ethernet Connector
The UNO-3074
is equipped
with
a Realtek
RTL8139C Ethernet LAN con-
troller
that is
fully compliant with IEEE
802.3u 10/100Base-T CSMA/CD
standards.
The Ethernet port provides
a standard RJ-45 jack on board,
and
LED indicators on the front side to show its Link
(Green LED) and
Active
(Yellow LED) status.
2.5 Onboard Isolated Digital Input
The
UNO-3074 has 4
isolated DI channels designated DI0~DI3.
2.5.1
Pin
Assignments
The connector type of UNO-3074 is
plug-in screw terminal block
that
enables
you to connect to field I/O
devices directly without additional
accessories. Figure 2.4 and Table 2.4 shows its pin assignment as well as
signal description.
Figure 2.4:
Digital Input
Connector Pin Assignments
RS-422 RS-485
COM3 Close A TX3-TR Data+, Data-
Close B RX3-TR
COM4 Close C TX4-TR Data+, Data-
Close D TX4-TR
Note:
Please refer to Figure A.3 for location of JP6