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D-SUB female connector layout 9 pin D-SUB female connector
electrically isolated RS485 communication interface to the PC
serial port  EIA-485 cable usually made with twisted pair (like
EIA-422) and may span up to 1200 metres. The recommended
arrangement of the wires is as a connected series of point-to-
point nodes, a line or bus. Ideally, the two ends of the cable
will have a termination resistor connected across the two wires
and two powered resistors to bias the lines apart when the lines
are not being driven. The value of each termination resistor
should be equal to the cable impedance (typically, 120 ohms for
twisted pairs).  Is this document correct or incorrect?. There
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listing > Pinout of RS232 to RS485 cable and layout of 9 pin
D-SUB female connector