User's Manual

MaxStream 9XStream™ Wireless OEM Module Manual v2.8

Confidential and Proprietary, ©MaxStream, Inc. 2001

Data Validity

To verify data integrity, a 16-bit cyclic redundancy check (CRC) is

computed for the transmitted data and attached to the end of each data packet

before transmission. The receiver will then compute the CRC on all

incoming data. Any received data that has an invalid CRC is discarded.

Transmission Latency

The length of time required to send a packet of data depends on the number

of bytes being sent and the baud rate. In addition, modules have a

Synchronization Timer option that can be manually configured using the SY

command as discussed in the 9XStream Commands Table (Appendix E).

Modifying this parameter can significantly change the transmission latency.

See the Timing Diagrams section for more information on transmission

latencies.

Note: As outlined in Figure 5a, a header always prefaces a data

packet. The header contains information that is used by all

receivers (within range) to synchronize their hopping

patterns to the transmitter. The length of the header can be

reduced in some applications by eliminating the

synchronization information. See

Timing Diagrams

for more

information.