User's Manual

MaxStream 9XStream™ Wireless OEM Module Manual v2.8

Confidential and Proprietary, ©MaxStream, Inc. 2001

Glossary

(cont.)

Data validity – Act of comparing received data with transmitted data to ensure

accurate transmission. Data validity is verified by performing a CRC check.

DI pin – All incoming serial data enters the 9XStream module on the Data In

(DI) pin (Pin 4).

DO pin – All received over-the-air data leaves the 9XStream module through the

Data Out (DO) pin (Pin 3). The data can then be sent to a microcontroller or RS-

232 device.

FCC – The Federal Communications Commission is the US government agency

responsible for regulating radio communications standards in the United States.

Flow control – Method of determining when serial data can be sent to the

module for over-the-air transmission. Flow control is used to prevent buffer

overflow. This can be implemented in hardware and/or software. Hardware

flow control is implemented in the 9XStream module using the CTS pin.

Frequency Hopping Spread Spectrum (FHSS) – Method employed by the

9XStream module which involves transmitting data over several different

channels in a specific channel hopping sequence known by the transmitter and

the receiver(s).

Half-duplex – A mode for radio operations. Radios that operate in half-duplex

are able to either transmit data or receive data at a given time, but cannot do both

simultaneously. When one module is transmitting, all modules (of the same

VID) within range listen to the transmission and will only transmit once the

transmission is complete.

Hardware flow control – See Flow Control.

Headers – Information that prefaces the data bits in transmitted data packets.

The header contains information used by the receiver(s) to synchronize to the

transmitter.

HyperTerminal – A serial communications program useful for communicating

with the 9XStream module and configuring user-defined operating parameters

through AT commands.

Idle Mode – A mode of operation in which the module is neither transmitting

nor receiving.

Industrial Temperature – Temperature tested version of 9XStream modules

extending beyond normal operating specifications (0ºC to 70ºC). These modules

are tested for a temperature range from -40ºC to 85ºC.