Product manual

9XTend‐PKG‐R™RS‐232/485RFModem–ProductManualv1.2.4

2.2. RS-485 (2-wire) Operation

2.2.1. DIP Switch Settings & Pin Signals

Figure2‐06.Figure2‐07.    

RS‐485(2‐wire)Half‐DuplexPinsusedonthefemaleRS‐232(DB‐9)

DIPSwitchSettingsSerialConnector



Figure2‐08.

RS‐485(2‐wire)withTermination(optional)



Terminationisthe120ΩresistorbetweenT+andT‐.



DIP

Switchsettingsarereadandappliedonlywhilepowering‐on.



Note: Refer to Figures 2-15 and 2-16 for RJ-45 connector pin designations used in

RS-485/422 environments.

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

XTend RF Modem

5 GND Ground Signal Ground

8 T/R+ (TRB) Positive Data Line

Transmit serial data to and from the

XTend RF Modem

9 PWR Power

Optional power input that is connected internally

to the front power connector

1, 3, 4, 6, 7 not used

2.2.2. Wiring Diagram

RS-485 (2-wire) Half-Duplex

Figure2‐09.XTendRFModeminanRS‐485(2‐wire)half‐duplexenvironment