2.3.3 Termination Resistor (SW3)
The onboard termination resistor (120 ohm) for COM3 can be used for long distance transmission or device matching. (Default Open.)
Table 2.1: Terminal Resistor for COM3
SW3 | | Status |
| | |
DIP1 | ON | Add termial resistor on Tx+/Tx- of RS-422 or |
| | Data+/Data- of RS-485 |
| | |
| OFF | Open (default) |
| | |
DIP2 | ON | Add termial resistor on Rx+/Rx- of RS-422 |
| | |
| OFF | Open (default) |
| | |
2.4 LAN: Ethernet Connector
UNO-2173A is equipped with one Giga LAN controller and UNO- 2173AF has two. The controller chip used in both model is RTL8111C Ethernet controller that is fully compliant with IEEE 802.3u 10/100Base- T CSMA/CD standards and IEEE 802.3ab specification for 1000Mbps Ethernet. 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 Power Connector
The UNO-2173A/AF comes with a Phoenix connector that carries 9~36 VDC external power input, and features reversed wiring protection. Therefore, it will not cause any damage to the system by reversed wiring of ground line and power line. Please refer to Appendix A.5
2.6 PS/2 Keyboard and Mouse Connector
The UNO-2173A/AF provides a PS/2 keyboard and mouse connector. A 6-pin mini-DIN connector is located on the rear panel. The UNO-2173A/ AF comes with an adapter to convert from the 6-pin mini-DIN connector to two 6-pin mini-DIN connectors for PS/2 keyboard and PS/2 mouse connection.
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