User`s guide

9XTend™ RS-232/422/485 RF Modem User’s Guide
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2.2. RS-485 (2-wire) Operation
2.2.1. DIP Switch Settings and Pin Signals
Note: Refer to Figure 2-15 and Figure 2-16 for the RJ-45 connector pin designations used in
RS-485/422 environments.
2.2.2. Wiring Diagram
Figure 2-09. XTend RF Modem in an RS-485 (2-wire) half-duplex environment
Table 2-02. RS-485 (2-wire half-duplex) signals and their implementations on the XTend RF Modem
DB-9 Pin RS-485 Name Description Implementation
2 T/R- (TRA) Negative Data Line Transmit serial data to and from the RF modem
5 GND Ground Signal Ground
8 T/R+ (TRB) Positive Data Line Transmit serial data to and from the RF modem
9PWR Power
Optional power input that is connected internally
to the front power connector
1, 3, 4, 6, 7 not used
Figure 2-06.
RS-485 (2-wire) Half-duplex
DIP Switch Settings
Figure 2-07.
Pins used on the female RS-232 (DB-9)
Serial Connector
Figure 2-08.
RS-485 (2-wire) w/ Termination (optional)
Termination is the 120 Ω resistor between T+ and T-.
DIP Switch settings are read and applied
only while powering-on.