User manual

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.
Note: Please refer to Figure A.4 and A.5 for location of JP6
2.4 LAN: Ethernet Connector
The UNO-3072Lis equipped with a Realtek RTL8139C Ethernet LAN
controller
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-3072Lhas 4 isolated DI channels designated DI0~DI3.
2.5.1 Pin Assignments
The connector type of UNO-3072Lis plug-in screw terminal block that
enables
you to connect to field I/O devices directly without additional
accessories. Figure 2.5 and Table 2.4 shows its pin assignment as well as
signal description.
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