WI.232FHSS-25-R datasheet(18/67 Pages) RADIOMETRIX

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

Revision 1.1.0

network, impeding valid communications. Assured delivery is enabled by setting bit 4 of

regNETWORKMODE.

Should the address information match exactly, the receiving module will immediately send an RF ACK

packet. This packet lets the sending module know that the message has been received. An RF ACK packet

is made up of 7 bytes of overhead, and is sent immediately following reception; CSMA delay is not applied to

RF ACK packets. When the sending module receives the RF ACK packet, it will mark the current block of

data as completed and update its buffer pointers. If this is the last message in the queue, the sending

module will assert the BE pin to indicate the state of the incoming buffer.

Troubleshooting Hint: Communications Problems. If you are unable to communicate with another module,

it is most likely caused by one of the following. First, check to make sure that you are using the same data

rate. Modules programmed with different data rates will not communicate nor share the RF channel with one

another. Second, ensure that your network mode and addressing is configured to properly access the

module of interest. Also, ensure that you are addressing a specific module when using acknowledgment.

Failure to do so will cause large delays and loss of data.

2.5. Exception Engine

Wi.232FHSS modules are equipped with an internal exception engine. When errors occur during module

operation, an exception is raised. Exception codes are stored in the regEXCEPTION register when they

occur, and cleared once they are read. If an exception code is already present in regEXCEPTION

following an error, the new exception code will overwrite the old value.

2.5.1. Exception Codes

Exception codes are organized by type for ease of masking (see Exception Masking). The following table

lists the exception codes and their meanings. All other values are reserved.

Exception Code

Exception Name

Description

0x08

EX_BUFOVFL

Internal UART buffers overflowed

0x09

EX_RFOVFL

Internal RF packet buffer overflowed

0x13

EX_WRITEREGFAILED

Attempted write to register failed

0x20

EX_NORFACK

Acknowledgement packet not received after maximum

number of retries

0x40

EX_BADCRC

Bad CRC detected on incoming packet

0x42

EX_BADHEADER

Bad CRC detected in packet header

0x43

EX_BADSEQID

Sequence ID was incorrect in ACK packet

0x44

EX_BADFRAMETYPE

Unsupported frame type specified

Table 5, Exception Codes

2.5.2. Exception Masking

Wi.232FHSS modules have an external pin, EX, that can be asserted to indicate to the host that an error has

occurred. The exception mask provides a simple method of discriminating which errors cause the EX pin to

toggle. If the exception code, once ANDed with the exception mask (regEXCEPTIONMASK), is non-zero,

the EX pin is asserted. Once the EX pin is asserted, the regEXCEPTION register must be read to return it to

low. The following table lists some example exception masks.

It is important to note that the exception mask has no effect on the exceptions stored in the exception

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