WI.232FHSS-250-R datasheet(16/67 Pages) RADIOMETRIX

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WI.232FHSS-25-R/ WI.232FHSS-250-R DATASHEET

Revision 1.1.0

2.4.1. GUID/MAC Mode

GUID/MAC mode supports point-to-point and broadcast communications. In this mode, endpoint addressing

is accomplished through the regNVDESTGUID[3-0] and regDESTGUID[3-0] registers. The module’s source

GUID (regMYGUID[3-0]) is fixed and programmed at the factory. MAC addressing mode is selected by

writing either 0x04 (MAC) or 0x14 (MAC w/ acknowledgement) to the regNETWORKMODE register. A

destination GUID of 0xFFFFFFFF causes the module to send broadcast messages; all modules within range

will receive and process these messages. A module will only process a MAC message if the message’s

destination address is 0xFFFFFFFF or it exactly matches its regMYGUID[3-0] address. Acknowledgement is

enabled by setting bit 4 of regNETWORKMODE. The GUID/MAC network mode includes 14 bytes of

overhead per RF packet. The following table lists some examples of how MAC addressing works.

Sender

Receiver

NetworkMode

MyGUID

DestinationGUID

MyGUID

Response

0x04

0x00001000

0xFFFFFFFF

0x00002000

Data sent to UART. No RF

ACK sent by either module.

0x00003000

0x14

0x00001000

0xFFFFFFFF

0x00002000

Data sent to UART. No ACK

sent by either module. This

configuration will cause

transmission problems.

0x00003000

0x14

0x00001000

0x00003000

0x00002000

Not processed- discarded.

0x00003000

Data sent to UART. RF ACK

sent to 0x00001000.

0x04

0x00001000

0x00002000

Data sent to UART. No RF

ACK sent.

0x00003000

Not processed- discarded.

Table 2, MAC Addressing Examples

2.4.2. User Addressing Mode

When User network mode is selected, transmitted packets locate endpoints using the customer ID and

destination User ID (specified in regCUSTID[1-0] and regUSERDESTID[1-0], respectively). An RF packet

sent with User Network mode enabled carries 16 bytes of overhead. On the receiving side, each module has

a User ID mask (regUSERIDMASK[1..0]) that it applies to both its own User ID (regUSERSRCID[1-0]) and

the incoming destination User ID. Once both are masked, if the results are equal, the receiving module will

pass the payload data to the application for presentation to the host. Additionally, if the incoming address,

once masked, equals the mask itself, its payload will be presented to the host. If an acknowledgement is

requested, the receiving module will respond only if the unmasked User IDs are equal. When using user

network mode to send packets to multiple users (mask not equal to 0xFFFF), assured delivery must be

disabled. Failure to do so could cause extreme delays in transmission and loss of data. The following table

shows some examples of user addressing at work.

Sender

Receiver

Network

Mode

User

SRCID

User

DESTID

User SRCID

User

IDMASK

Response

0x06

0x1000

0xFFFF

0x2000

0xFFFF

Data sent to UART. No RF ACK

sent by either module.

0x3000

0xFFFF

0x16

0x1000

0xFFFF

0x2000

0xFFFF

Data sent to UART in both

modules. No ACK sent by either

module. This configuration will

cause transmission problems.

0x3000

0xFFFF

0x16

0x1000

0x3000

0x2000

0xE000

Data sent to UART. No RF ACK

sent.

WI.232FHSS-250-R Datasheet(PDF) 16 Page - Radiometrix Ltd

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