Product manual

XStream‐PKG‐R™RS‐232/485RFModem–ProductManualv4.2B
©2005MaxStream,Inc.Confide 
2.3. RS-485 (4-wire) & RS-422 Operation
2.3.1. DIP Switch Settings and Pin Signals
Figure2.10.Figure2.11.    
RS‐485(4‐wire)andRS‐422PinsusedonthefemaleRS‐232(DB‐9)
DIPSwitchSettingsSerialConnector
Figure2.12.
RS‐485(4‐wire)&RS‐422withTermination(optional)
Termination is the 120  resistor between T+ and T-.
DIP Switch settings are read and applied only while powering-on.
Table2.3. RS‐485/422(4‐wire)Signalsandtheirimplementationswith theXStream‐PKG‐RRFModem
DB-9 Pin
RS-485/422
Name
Description Implementation
2 T- (TA)
Transmit Negative
Data Line
Serial data sent from the XStream RF Modem
3 R- (RA)
Receive Negative
Data Line
Serial data received by the XStream RF Modem
5 GND Signal Ground Ground
7 R+ (RB)
Receive Positive
Data Line
Serial data received by the XStream RF Modem
8 T+ (TB)
Transmit Positive
Data Line
Serial data sent from the XStream RF Modem
9 PWR Power
Optional power input that is connected internally
to the front power connector
1, 4, 6 not used
Wiring Diagram: RS-485 (4-wire) Half-Duplex
Figure2.13.XStreamRFModeminanRS‐485(4‐wire)environment
ntial&Proprietary   10