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UNO-2174A/2178A User Manual 16

2.5.3 RS-485 Auto Flow & RS-422 Master/Slave Mode

You can set the “Auto Flow Control” mode of RS-485 or “Master/Slave”

mode of RS-422 by using the SW4 DIP switch for COM A and COM B..

In RS-485, if the switch is set to “Auto”, the driver automatically senses

the direction of the data flow and switches the direction of transmission.

No handshaking is necessary.

In RS-422, if DIP switch is set to “On,” the driver is always enabled, and

always in high or low status.

2.6 LAN: Ethernet Connector

UNO-2174A/2178A is equipped with two Gigabit LAN controllers. 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.

Table 2.1: Auto Flow & Slave/Master Selection

SW4 DIP Switch Setting COM Port Mode Selections

(Default)

COM A

RS-422: Slave mode

RS-485: Auto flow control

COM B

RS-422: Slave mode

RS-485: Auto flow control

COM A

RS-422: Master mode

RS-485: N/A

COM B

RS-422: Slave mode

RS-485: Auto flow control

COM A

RS-422: Slave mode

RS-485: Auto flow control

COM B

RS-422: Master mode

RS-485: N/A

COM A

RS-422: Master mode

RS-485: N/A

COM B

RS-422: Master mode

RS-485: N/A

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