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The following figure shows the RS-485 (2-wire) with termination (optional) DIP switch settings.
Enabling termination activates a 120 Ω resistor between T+ and T-.
The following figure shows the pins that the female RS-232 (DB-9) serial connector uses.
For the RJ-45 connector pin designations to use in RS-485/422 environments see
page 93 and
The following table provides the RS-485 (2-wire half-duplex) signals and their implementations on the Module
Assembly.
DB-9 Pin
2
5
8
9
1, 3, 4, 6, 7
RS-485 wiring diagrams
The following diagram shows the Module Assembly in an RS-485 (2-wire) half-duplex environment.
XTend RF Module User Guide
Female DB-9 to RJ-45 Adapter
RS-485 name
Description
T/R- (TRA)
Negative data
line
GND
Ground signal
T/R+ (TRB)
Positive data line
PWR
Power
not used
on page 94.
Implementation
Transmit serial data to and from the Module Assembly
Ground
Transmit serial data to and from the Module Assembly
Optional power input that is connected internally to the
front power connector
RS-485 wiring diagrams
Male DB-9 to RJ-45 Adapter
on
97
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