9XCite™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]
©2007MaxStream,Inc. 7
2.InterfacingProtocol
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‘PinReferenceName’providesanassociativetagthatreferencescommandsusedtodefinepinbehaviors.
GPIstandsforʺGeneralPurposeInputʺandGPOstandsforʺGeneralPurposeOutputʺ.Asanexample,theCD
commandisusedtodefinethebehaviorofGPO2(DB‐9pinnumber1).The
‘PinReferenceName’isthename
usedwhenreferringtoXCitecommandsandparameters.
Table2‐01. RS‐232SignalsandtheirimplementationsontheXCiteRFModem
(Low‐assertedsignalsaredistinguishedbyhorizontallineoverpinname.)
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)
7
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
Figure2‐01.
RS‐232DIPSwitchSettings
DIPSwitchsettingsarereadandapplied
onlywhilepowering‐on.
Figure2‐02.
PinsusedonthefemaleRS‐232(DB‐9)
SerialConnector
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