Advantech Celeron M Universal Network Controller with PC/104 Extension UNO-2170 Instrukcja Użytkownika Pobierz pdf (Strona 17)

11 Chapter 2

2.3.6 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 SW3 DIP switch for each RS-422/485 port.

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.

Table 2.1: Auto Flow & Slave/Master Selection

SW3 DIP Switch Setting COM Port Mode Selections

COM3

RS-422: Slave mode

RS-485: Auto flow control

COM4

RS-422: Slave mode

RS-485: Auto flow control

COM3

RS-422: Master mode

RS-485: N/A

COM4

RS-422: Slave mode

RS-485: Auto flow control

COM3

RS-422: Slave mode

RS-485: Auto flow control

COM4

RS-422: Master mode

RS-485: N/A

COM3

RS-422: Master mode

RS-485: N/A

COM4

RS-422: Master mode

RS-485: N/A

1

2

O

N

1

2

O

N

1

2

O

N

1

2

O

N

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 35 36

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