WI.232FHSS-25-R datasheet(19/67 Pages) RADIOMETRIX

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

Revision 1.1.0

Exception Mask

Exception Name

0x08

Allows only EX_BUFOVFL and EX_RFOVFL to trigger the EX pin

0x10

Allows only EX_WRITEREGFAILED to trigger the EX pin

0x20

Allows only EX_NORFACK to trigger the EX pin

0x40

Allows only EX_BADCRC, EX_BADHEADER, EX_BADSEQID, and EX_BADFRAMETYPE

exceptions to trigger the EX pin

0x60

Allows EX_BADCRC, EX_BADHEADER, EX_BADSEQID, EX_BADFRAMETYPE, and

EX_NORFACK exceptions to trigger the EX pin

0xFF

Allows all exceptions to trigger the EX pin

Table 6, Example Exception Masks

2.6. Resetting Module to Factory Defaults

It may be necessary to reset the non-volatile registers to their factory defaults. To reset the module to

factory defaults, hold the command line low and cycle power to the module. The command line must

remain low for a minimum of 600ms after resetting the module. Once the command line is released, the

module’s non-volatile registers will be reset to factory defaults.

2.7. Compatibility Mode

The Wi.232FHSS-250-R operates at a much narrower receive bandwidth (200kHz) than the Wi.232FHSS-

25 (600kHz). When the Wi.232FHSS-25 transmits, it deviates well outside the receiver bandwidth of the

Wi.232FHSS-250-R. To address this problem, v1.0.5 and later Wi.232FHSS-25 firmware and all

Wi.232FHSS-250-R’s support a compatibility mode. This allows both modules to communicate effectively

with each other.

When enabled, compatibility mode reduces the maximum RF data rate to 76.8kbps, reduces the

Wi.232FHSS-25’s deviation to 80kHz, and reduces the Wi.232FHSS-25’s receiving bandwidth to 200kHz.

All UART baud rates are supported, although the RF data rates associated with baud rates 31250, 38400,

57600, and 115200 will be diminished.

2.8. Automatic Gain Control and Manual Gain Control

Automatic gain control is a feature exclusive to the Wi.232FHSS-250-R module. For both modules, the

gain setting of the receiver low noise amplifier (LNA) is adjustable.

By default, the Wi.232FHSS-25 module is configured for maximum receiver sensitivity. Similarly, the

Wi.232FHSS-250-R is factory-configured to use its internal automatic gain control (AGC) circuit to manage

receiver sensitivity. Reducing the gain increases the linearity of the receiver, but reduces maximum

sensitivity; increasing the gain does the opposite. Generally speaking, higher linearity (increased third

order input intercept point, IIP3) will give improved performance in high-interference environments; high

gain yields better performance in low-interference environments.

The Wi.232FHSS-250-R contains an AGC circuit that manages these settings automatically, and it should

be used whenever possible. However, when attempting to make analog RSSI measurements, fixing the

LNA gain will produce more meaningful results. Digital RSSI readings are internally compensated and may

be taken with AGC enabled.

WI.232FHSS-25-R 数据表(PDF) 19 Page - Radiometrix Ltd

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