TRM-915-R250 datasheet(10/39 Pages) LINX

10 / 39 page

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GUID Networking Mode

GUID networking mode is the simplest mode and supports point-to-point

and broadcast communications. Each module is programmed at

the factory with a unique 4-byte ID number that cannot be changed.

These bytes are found in the non-volatile read only MYGUID registers

(regMYGUID[0-3]). GUID networking mode uses these IDs as addresses.

The transmitting unit’s GUID is used as the source address and the

intended receiver’s GUID is written into the destination address register

(regDESTGUID[0-3]). All modules within range hear the transmission, but

only the module with the ID that matches the destination address outputs

the data on its UART. All others ignore the transmission.

A broadcast message is created when the destination address is

0xFFFFFFFF. In this case, all modules within range output the data. It is not

recommended to send broadcast messages when acknowledgements are

enabled. Figure 11 lists some examples of how GUID networking works.

Networking Modes

The module has a very flexible addressing and networking scheme selected

with the regNVNETWORKMODE and regNETWORKMODE registers. It

can be changed during operation. The transmitting module addresses

packets according to the network mode configuration. The receiving

module processes all addressing types regardless of the network mode

configuration. If the received message matches the addressing criteria, it is

output on the UART. Otherwise it is discarded.

There are three networking modes: GUID, User and Extended User. Each

mode offers different communications schemes, but all use source and

destination addressing. The source address is for the transmitting unit,

the destination address is the intended receiver. Each mode uses different

registers for the source and destination addresses.

The module supports an automatic addressing mode that reads the

Source Address from a received packet and uses it to fill the Destination

Address register. This makes sure that a response is sent to the device that

transmitted the original message. This also allows the host microcontroller

to read out the address of the sending unit.

The automatic addressing is enabled for the different networking modes

with register regAUTADD and regNVAUTADD.

250 Series Transceiver GUID Network Mode Examples

Sender

Receiver

Network

Mode

MyGUID

Destination

GUID

MyGUID

Response

0x04

(GUID)

0x00001000 0xFFFFFFFF

0x00002000 Data output by both modules.

No RF ACK sent by either

module.

0x00003000

0x14

(GUID +

ACK)

0x00001000 0xFFFFFFFF

0x00002000 Data output by both modules.

No ACK sent by either module.

This configuration causes

transmission problems.

0x00003000

0x14

(GUID +

ACK)

0x00001000 0x00003000

0x00002000 Not processed – discarded.

0x00003000 Data output. RF ACK sent to

0x00001000

0x04

(GUID)

0x00001000 0x00002000

0x00002000 Data output. No RF ACK sent.

0x00003000 Not processed – discarded.

Figure 11: 250 Series Transceiver GUID Network Mode Examples

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