User's Manual
9XTend™ OEM RF Module - Product Manual v2.x6x
© 2010 Digi Internatonal, Inc. 78
RS-485 (2-wire) Operation
When operating within the RS-485 protocols, all communications are half-duplex.
DIP Switch Settings and Serial Port Connections
Figure B- erugiF.61 B-17.
RS-485 (2-wire) Half-duplex Pins used on the female RS-232 (DB-9)
DIP Switch laireSsgnitteS Connector
Note: Refer to Figures B-09 and B-10 for RJ-45 connector pin designations used in
RS-485/422 environments.
Wiring Diagram
Figure B-19. XTend Module Assembly in an RS-485 (2-wire) half-duplex environment
Table B-05. RS-485 (2-wire half-duplex) signals and their implementations on the XTend Module Assembly
DB-9 Pin RS-485 Name Description Implementation
2 T/R- (TRA) Negative Data Line Transmit serial data to and from the XTend Module Assembly
dnuorGlangiS dnuorGDNG5
8 T/R+ (TRB) Positive Data Line Transmit serial data to and from the XTend Module Assembly
9 PWR Power
Optional power input that is connected internally
to the front power connector
desu ton7 ,6 ,4 ,3 ,1
Figure B-18.
RS-485 (2-wire) w/ Termination (optional)
Termination is the 120 resistor between T+ and T-.
DIP Switch seings are read and applied only while powering-on.