TV Converter Box User Manual

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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)