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

©2007MaxStream,Inc. 7

2.InterfacingProtocol

The 9XCite RS-232/485 RF Modem supports the following interfacing protocols:

• RS-232

• RS-485 (2-wire) Half-duplex

• RS-485 (4-wire) and RS-422

2.1. RS-232 Operation

2.1.1. DIP Switch Settings and Pin Signals

*The‘PinReferenceName’providesanassociativetagthatreferencescommandsusedtodefinepinbehaviors.

GPIstandsforʺGeneralPurposeInputʺandGPOstandsforʺGeneralPurposeOutputʺ.Asanexample,theCD

commandisusedtodefinethebehaviorofGPO2(DB‐9pinnumber1).The

‘PinReferenceName’isthename

usedwhenreferringtoXCitecommandsandparameters.

Table2‐01. RS‐232SignalsandtheirimplementationsontheXCiteRFModem

(Low‐assertedsignalsaredistinguishedbyhorizontallineoverpinname.)

DB-9 Pin

RS-232

Name

Pin Reference

Name*

Description Implementation

1 DCD DO2 Data-Carrier-Detect Connected to DSR (pin6)

2 RXD DO Received Data Serial data exiting the RF modem (to host)

3 TXD DI Transmitted Data Serial data entering into the RF modem (from host)

4 DTR DI2 Data-Terminal-Ready Can enable Power-Down on the RF modemy

5 GND - Ground Signal Ground

6 DSR DO2 Data-Set-Ready Connected to DCD (pin1)

RTS

CMD

DI1

Request-to-Send /

Command Mode

Provides RTS

flow control or enables Command Mode

8 CTS DO1 Clear-to-Send Provides CTS flow control

9 RI - Ring Indicator

Optional power input that is connected internally to the

positive lead of the front power connector

Figure2‐01.

RS‐232DIPSwitchSettings

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

onlywhilepowering‐on.

Figure2‐02.

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

SerialConnector

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