KTI Networks KSC-240, Installation Manual

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The converter features RS-485 driver and receiver in one device. It also
provides very flexible configuration settings for Driver Enable control
and Receiver Enable control. The configuration for the node in RS-485 2-
wire network is:
SW1-2&1 2W Select 2-wire topology
SW1-4 TXC Enable RTS/ADC Control for Driver
SW1-6 RXC Enable RTS/ADC Control for Receiver
SW1-5 RTS-E Use RTS control (optional)
SW2-1 SDE Use ADC control (optional)
SW2-2-8 Baud Baud when ADC control is enabled (optional)
SW1-3 T-D Disable internal terminator (optional)
3.5 RS-485 Full-duplex 4-wire Network
The 4-wire network simplifies bus arbitration in multi-node RS-485. A
single Master node is the only driver allowed on the top most wire pair.
All other nodes listen to all data traffic that passes on the party-line type
multi-drop bus. Nodes may transmit on the lower pair of wires when
addressed by the master node or by using a software token-passing bus
arbitration scheme.