XIB-R【PDF 30/36 页】BOARD INTERFACE RS232/485

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4.1.2. Channel (ATHP)

Channels provide a network layer from which channels can be used for isolation. HP (Channel)

Parameter is used to define channel values.

Hopping Channel Mode: HP Parameter value range is 0 through 6

Single Frequency Channel Mode: HP range is 0 through 0x18 (decimal range: 0 - 24)

In "Hopping Channel Mode", each channel utilizes a different pseudo-random hopping sequence to

navigate through shared hopping channels. In the event that two modems from different networks

collide on a channel, the two modems will jump to separate channels on the next hop. Multiple

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

4.1.3. Destination Address (ATDT) and Address Mask (ATMK)

XCite Destination Addresses and Masks provide the means to set up global or local addresses for

establishing modem groups, subnets, etc. The Destination Address network layer provides for

more granular isolation of radio modems. The XCite Destination Addresses and Masks can be used

to:

" Set up point-to-point and point-to-multipoint network configurations

" Provide greater flexibility in establishing modem groups, subnets, etc.

Each radio modem in a network can be configured with a 16-bit Destination Address to establish

selective communications within a network. This address is set to one of 65535 values using DT

(Destination Address) Command. The default Destination Address is 0.

All radio modems with the same Destination Address can transmit and receive data among them-

selves. Radio modems having different Destination Addresses still detect and listen to the data (in

order to maintain network synchronization); however, the data is discarded data rather than pass-

ing on through the DO pin.

Packet-based Radio Modems

XCite Radio Modems are packet based. This means all data shifted into one modem is packetized

and sent out the antenna port. Because XCite modems use a peer-to-peer architecture, all

modems on the same channel (ATHP) will receive the packet and decide whether to pass it to the

host or to throw it away. Each transmitted packet contains information about the transmitting

modem.

Any modem that receives a packet will check the address values and decide what to do with the

packet. The options are as follows:

" Receive the packet as a global packet

" Receive the packet as a local packet

" Discard the packet

Address Mask

The mask parameter can be used to allow a base modem to receive data from a range of

addresses. It may also be used to configure "subnets" of modems that communicate in a group

together.

Refer to the Bit-wise AND Truth table for the Pseudo 'C' Code that qualifies the Destination

Addresses and address masks.

The Pseudo Code uses the bit-wise "AND" operation, "&". This operation is performed bit by bit on

each of the 16 bits in the TXDT, RXDT and RXMK parameters.

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