Product manual

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

2.3. RS-485 (4-wire) & RS-422 Operation

2.3.1. DIP Switch Settings & 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ΩresistorbetweenT+andT‐

.

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

Table2‐03. RS‐485/422(4‐wire)Signalsandtheirimplementationswith theXTend‐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 XTend RF Modem

3 R- (RA)

Receive Negative

Data Line

Serial data received by the XTend RF Modem

5 GND Signal Ground Ground

7 R+ (RB)

Receive Positive

Data Line

Serial data received by the XTend RF Modem

8 T+ (TB)

Transmit Positive

Data Line

Serial data sent from the XTend RF Modem

9 PWR Power

Optional power input that is connected internally

to the front power connector

1, 4, 6 not used

2.3.2. Wiring Diagrams

RS-485 (4-wire) Half-Duplex

Figure2‐13.XTendRFModeminanRS‐485(4‐wire)environment