Product manual

XStream‐PKG‐R™RS‐232/485RFModem–ProductManualv4.2B
©2005MaxStream,Inc.Confidential&Proprietary   12
3. ModemOperation
3.1. Serial Communications
3.1.1. RS-232 and RS-485/422 Data Flow
Devices that have a UART interface can connect directly through the pins of the XStream Modem
as is shown in the figure below.
Figure3.1. SystemDataFlowDiagraminaUART‐interfacedenvironment
(Low‐assertedsignalsdistinguishedwithhorizontallineoversignalname.)
3.1.2. Host and RF Modem I/O Settings
Serial communications between a host and an XStream RF Modem are dependent upon having
matching baud rate, parity, stop bit & number of data bits settings. Refer to the table below to
ensure host serial port settings match those of the XStream RF Modem.
Table3.1. ParametervaluescriticaltoserialcommunicationsbetweentheRFModemandhost
Parameter Setting XStream RF Modem Default Parameter Value
Baud (Serial Data Rate) 9600 bps or 19200 baud (Factory-set RF data rates)
Number of Data Bits 8 (NB parameter = 0)
Parity None (NB parameter = 0)
Number of Stop Bits 1 (NB parameter = 0)
Both the XStream RF Modem and host (PC) settings can be viewed and adjusted using
MaxStream’s proprietary X-CTU Software. Use the “PC Settings” tab to configure host settings.
Use the “Terminal” or “Modem Configuration” tabs to configure the RF Modem settings. Refer to
the Modem Configuration sections for more information.