Product manual

XStream‐PKG‐R™RS‐232/485RFModem–ProductManualv4.2B
©2005MaxStream,Inc.Confidential&Proprietary   7
2. InterfacingProtocol
The XStream-PKG-R 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
Figure2.1.Figure2.2.   
RS‐232DIPSwitchSettingsPinsusedonthefemaleRS‐232(DB‐9)
SerialConnector
DIPSwitchsettingsarereadandapplied
onlywhilepowering‐on.
Table2.1. RS‐232SignalsandtheirimplementationsontheXStreamRFModem
(Low‐assertedsignals
aredistinguishedbyhorizontallineoverpinname.)
DB-9 Pin
RS-232
Name
AT Command
Reference*
Description Implementation
1 DCD DO3 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 DI3 Data-Terminal-Ready Can enable POWER-DOWN on the RF Modem
5 GND - Ground Signal Ground
6 DSR DO3 Data-Set-Ready Connected to DCD (pin1)
7
/
CMD
DI2 Request-to-Send
Provides flow control or
enables “Command Mode” on the RF Modem
8 DO2 Clear-to-Send Provides flow control
9 RI - Ring Indicator
Optional power input that is connected internally to
the positive lead of the front power connector
*InsidetheXStreamRFModemisanXStreamOEMRFModule.Thenamesinthiscolumnrefertothepin
signalsoftheembeddedRFmodule.XStreamCommands[p22]usedtoconfigurepinbehaviorsarenamed
accordingtothepinsofthemodule,nottheRS‐232connectionpins.