Rs-485 Auto Flow & Rs-422 Master/Slave Modes; Table 2.8:Sw3 Dip Setting; Redundant Rs-422 Matter; Table 2.9:Mapping Table Of Switches For Com Port - Advantech UNO-4683 User Manual

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2.4.6 RS-485 Auto Flow & RS-422 Master/Slave Modes

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 COM1, COM2. Please

also refer to Table 2.9 for the COM port mapping with the DIP.

In RS-485, if the switch is set to "Off", 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. Please refer below for the default setting.

Table 2.8: SW3 DIP Setting

SW3 Status

OFF (Default)

In the occasion that UNO-4683 RS-422 ports need to act as multi-master

in parallel with other RS-422 master ports. Because of the auto detection

function, the TX port will also receive data from other RS-422 master. To

avoid this situation in this kind of application, user can use SW5and SW7

to turn it off, then no data will be received from TX port. Please refer to

the Table 2.11 for the COM port mapping and refer to Figure 2.3 for the

location.

Table 2.9: Mapping table of switches for COM port

COM port

COM1

COM2

Description

RS-422: Master mode

RS-485: N/A

RS-422: Slave mode

RS-485: Auto flow control

Switches Status

SW5

ON: Normal (default)

OFF: RS-422 multi-master

SW7

Chapter 2

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