The master node may drive its bus while any of the slave nodes are driving the lower pair, making this 4-wire network a full-duplex communi- cation channel. All communication occurs from master to slave or slave to master, so any peer to peer communications must be routed through the master node.

To convert an RS-232 device into a Master node in RS-485 4-wire net- work, the configuration is:

SW1-2&1

4W

Select 4-wire topology

SW1-4

TXE

Enable Driver always

SW1-6

RXC

Enable RTS/ADC Control for Receiver

SW1-5

RTS-E

Use RTS control (optional)

SW2-1

SDE

Or use ADC control (optional)

SW2-2-8

Baud

Baud when ADC control is enabled (optional)

SW1-3

T-D

Disable internal terminator (optional)

To convert an RS-232 device into a Slave node in RS-485 4-wire network, the configuration is:

SW1-2&1

4W

Select 4-wire topology

SW1-4

TXC

Enable RTS/ADC Control for Driver

SW1-6

RXE

Enable Receiver always

SW1-5

RTS-E

Use RTS control (optional)

SW2-1

SDE

Or use ADC control (optional)

SW2-2-8

Baud

Baud when ADC control is enabled (optional)

SW1-3

T-D

Disable internal terminator (optional)

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Image 40
KTI Networks KSC-240 manual Or use ADC control optional