FLIR Commercial Systems Inc. RT30 Manuale Utente

  

™ Engineering Design Specification

 

 

Page 11 of 20

                  

The  RT30 shall use the Nordic Semiconductor nRF905 for both the TU and RU RF system controllers.  The 
nRF905 was chosen for its combination of low power operation, minimal overhead, and system flexibility. 
 
Features of the nRF905 include: 

 

•  433MHz, 868MHz, or 915MHz band 

•  SPI port communication 

• proprietary 

ShockBurst™ low-power operation 

•  low-power standby mode 

•  32-bit addressing minimizes false communication 

•  programmable output power and frequency 

•  automatic generation of 8/16-bit CRC 

• 32-pin 

QLCC 

package 

 

 

The two nRF905 devices shall be programmed to use the following parameters: 
 
 

Center Frequency 

869.0MHz (EU version) 
914.0MHz (NA version) 

Channel Spacing 

0.6MHz 

Transmission Power 

+10dBm (10mW) 

Transmission Mode 

ShockBurst 

Transmission Length 

< 3mS (Standard) 

< 8mS (Extended) 

(1)

Transmission Period 

250mS 

Receiver Mode 

Normal 

Preamble Size 

10-bit 

(2)

Address Size 

32-bit 

Command Size 

8-bit 

Standard Data Size 

24-bit 

Extended Data Size 

232-bit (29 bytes) 

Checksum CRC-16 

 

Notes: 

1. 

Extended transmission is not supported at this time. 

 

2. 

Fixed value defined in the nRF905. 

 
 

All communications shall follow the conventions defined in the Extech specification, Inter-Module RF 
Communications Rev 1.2

.