User's Manual

MaxStream 9XStream™ Wireless OEM Module Manual v2.8

Confidential and Proprietary, ©MaxStream, Inc. 2001

Networks

Within each VID, there are seven available networks. Each network utilizes a

different pseudo-random hopping sequence to navigate through the shared

hopping channels. In the event that two modules from different networks collide

on a channel (because they hop in a different sequence) the two modules will

jump to separate channels on the next hop. Using networks, multiple module

pairs can operate in the same vicinity with minimal interference from each other.

The network parameter is user-definable using the HP command as described in

the 9XStream Command Table (Appendix E).

Module Address

Module Addresses and Module Address Masks provide another level of

addressing among 9XStream modules. Each module in a network can be

configured with a 16-bit Module Address to establish selective communications

within a network. This address is set to one of 65535 values using the “DT”

command. The default Module Address is 0000H.

All modules with the same Module Address can transmit and receive data among

themselves. Any modules on a network with different Module Addresses will

still detect and listen to the data in order to maintain network synchronization.

However, they will not send the data out to their serial ports if their Module

Addresses don’t match the Module Address of the transmitter. (The Module

Address Mask can be used to provide exceptions to this rule as described in the

following section.)

Module Address Mask

The Module Address Mask can be used as an additional method to facilitate

communication among modules. The Module Address Mask can also be set to

one of 65535 possible values using the MK command. The default value is

FFFFH.

All transmitted data packets contain the Module Address of the transmitting

module. When a transmitted packet is received by a module, the Transmitter

Module Address (contained in the packet) is logically “ANDed” (bitwise) with

the Receiver Module Address Mask. If the resulting value matches the

Receiver Module Address, or if it matches the Receiver Module Address Mask,

the packet is accepted. Otherwise, the packet is discarded.

Note: When performing this comparison, any “0” values in the

Receiver Module Address Mask are treated as

Irrelevant

values

and are ignored.