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Appendix A – Sample Firmware
The following sample firmware allows an application to use a frequency agility
algorithm to allow the receiver to listen on an optimal frequency. In this sample,
there are three channel frequencies used: channel 27 (909.37MHZ), channel 51
(915.36MHz) and channel 75 (921.37MHz).
The application will periodically poll the receiver’s RSSI for each channel
frequency, selecting the frequency with the lowest RSSI. This will be the
listening channel of the receiver. When the application needs to transmit data,
it will send the same data message at each of the three channel frequencies.
When done transmitting, the application will put the NT module back into
receive mode, listening on the selected quietest channel.
//******************************************************************************
/*
--------------------------------------------------------------------------------
Overview: This function reads RSSI from the NT module on each of three
channel frequencies. The channel with the lowest value for RSSI
is selected as the active listening channel.
The order for serial communication is as follows:
1. Set the NT to software control for channel and RX/TX select.
2. Set the NT to receive mode.
3. Set the NT to each channel frequency while reading RSSI.
4. Set the NT to the 1st channel frequency.
5. Read RSSI from the NT module.
6. If RSSI is lower than the previous RSSI, use this channel.
7. Set the NT to the 2nd channel frequency.
8. Read RSSI from the NT module.
9. If RSSI is lower than the previous RSSI, use this channel.
10. Set the NT to the 3rd channel frequency.
11. Read RSSI from the NT module.
12. If RSSI is lower than the previous RSSI, use this channel.
13. Set the NT channel to the quietest frequency selected.
Input:
none
Output: none
--------------------------------------------------------------------------------
*/
//******************************************************************************
void Select_RX_Channel(void)
{
static unsigned int8 i, rx_ch, temp;
static unsigned int8 nt_rply[4] = {0,0,0,0};
static unsigned int8 channel[3] = {27,51,75};
static signed int8 prev_rssi;
static signed int8 rssi_val;
// Initialize the previous RSSI value to 0dBm
prev_rssi = 0;
// Initialize the RX channel to the 1st channel in the sequence
rx_ch = channel[0];
// Set the NT module for software control of Channel and RX/TX Select.
printf(“ %c%c%c%c ”, 0x02, 0x14, 0x05, 0xFF);
// Flush the NT ACK response by waiting for the terminating character
while (getc() != 0xFF);
– 8 –
NT Series Command Data Interface
Reference Guide RG-00101
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相关代理商/技术参数
TRM-900-TT
制造商:Linx Technologies Inc 功能描述:M2M ACCESSORY
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制造商:Linx Technologies Inc 功能描述:M2M ACCESSORY
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功能描述:射频模块 915 MHz Wireless Module DP1203
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
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功能描述:射频模块 915 MHz Wireless Module DP1205
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
TRM-915-DTS
功能描述:射频模块 915 MHz Wireless Module DTS North Am
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TRM-915-DTS-BRZ
功能描述:射频模块 Module DTS Brazil
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
TRM-915-DTS-FCC
功能描述:射频模块 915 MHz Wireless Mod DTS FCC ST conn
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
TRM-915-DTS-FCC-RA
功能描述:射频模块 915 MHz Wireless Mod DTS FCC RA conn
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm