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9XCite™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 9

2.2. RS-485 (2-wire) Operation

2.2.1. DIP Switch Settings and Pin Signals

Note: Refer to the figures in the “RS-485/422 Connection Guidelines” section for RJ-45 connector

pin designations used in RS-485/422 environments.

2.2.2. Wiring Diagram

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

Table2‐02. RS‐485(2‐wirehalf‐duplex)signalsandtheirimplementati onsontheXCiteRFModem

DB-9 Pin RS-485 Name Description Implementation

2 T/R- (TRA) Negative Data Line Transmit serial data to and from the RF modem

5 GND Ground Signal Ground

8 T/R+ (TRB) Positive Data Line Transmit serial data to and from the RF modem

9PWR Power

Optional power input that is connected internally

to the front power connector

1, 3, 4, 6, 7 not used

Figure2‐06.

RS‐485(2‐wire)Half‐duplex

DIPSwitchSettings

Figure2‐07.

PinsusedonthefemaleRS‐232(DB‐9)

SerialConnector

Figure2‐08.

RS‐485(2‐wire)w/Termination(optional)

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

DIPSwitchsettingsarereadandapplied

onlywhilepowering‐on.

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Digi 9XCite-PKG Handbuch Seite 9