Product manual

XStream‐PKG‐R™RS‐232/485RFModem–ProductManualv4.2B
©2005MaxStream,Inc.Confidential&Proprietary   9
2.2. RS-485 (2-wire) Operation
2.2.1. DIP Switch Settings and Pin Signals
Figure2.6.Figure2.7.    
RS‐485(2‐wire)Half‐DuplexPinsusedonthefemaleRS‐232(DB‐9)
DIPSwitchSettingsSerialConnector
Figure2.8.
RS‐485(2‐wire)withTermination(optional)
Termination is the 120  resistor between T+ and T-.
DIP Switch settings are read and applied only while powering-on.
Note: Refer to Figures 2.15 & 2.16 for RJ-45 connector pin designations used in
RS-485/422 environments.
Table2.2. RS‐485(2‐wirehalf‐duplex)SignalsandtheirimplementationsontheXStreamRFModem
DB-9 Pin RS-485 Name Description Implementation
2 T/R- (TRA) Negative Data Line
Transmit serial data to and from the
XStream RF Modem
5 GND Ground Signal Ground
8 T/R+ (TRB) Positive Data Line
Transmit serial data to and from the
XStream RF Modem
9 PWR Power
Optional power input that is connected internally
to the front power connector
1, 3, 4, 6, 7 not used
Wiring Diagram: RS-485 (2-wire) Half-Duplex
Figure2.9.XStreamRFModeminanRS‐485(2‐wire)half‐duplexenvironment