Protokol kontrol komunikasi modul Mini_COFDM Ethernet Vcan1886

Protokol kontrol komunikasi modul Mini_COFDM Ethernet Vcan1886

1. Parameter port serial kontrol komunikasi

8 Data bit

1 stop bit

bahkan paritas

baud rate: 19200

2. Module Configuration Parameters

The module configuration parameters are written by writing a 256×8 of RAM To achieve this, the configured parameters are valid after saving reset, or powering on again. Setelah sistem dihidupkan atau direset, port serial akan dicetak {AAAAA｝

Deskripsi Parameter RAM

RAM[0]: Kontrol pengaturan ulang sistem, dapat dibaca dan ditulis, Reading and writing represent different meanings: 

Menulis

00 Daya keluaran RF yang dapat dikonfigurasi> Reset the whole system, Serial returns {AAAAA}, menunjukkan bahwa sistem telah direset

01 Daya keluaran RF yang dapat dikonfigurasi> Simpan parameter yang ditetapkan oleh pengguna, Serial returns {000101｝, indicates successful execution

02 Daya keluaran RF yang dapat dikonfigurasi> Restore parameters to system default parameters, Serial returns {000202}, menunjukkan keberhasilan eksekusi

03Daya keluaran RF yang dapat dikonfigurasi> Cari titik frekuensi bandwidth yang ditentukan. Port serial kembali {000303｝, indicates successful execution

04Daya keluaran RF yang dapat dikonfigurasi> Search for the specified frequency when the parameters are known, kembali {000404｝, indicates successful execution

05Daya keluaran RF yang dapat dikonfigurasi> reloadkey, Serial port parameter setting of transmitting parameters and data serial port, returns {000505｝, indicates successful execution

06Daya keluaran RF yang dapat dikonfigurasi> Dynamically modify the decay parameters of the emission (write RAM[8] The attenuation value takes effect immediately after the command is issued, and does not reset the emission. After power off, and power on again, RAM[8]is the previously saved value),

kembali{000606｝,Indicates successful execution

other=> menyimpan

membaca: 

Sedikit[0] Daya keluaran RF yang dapat dikonfigurasi> 

‘1’ = Transmitter RF frequency lock

‘0’= Transmitter RF Frequency not locked

Sedikit[1] Daya keluaran RF yang dapat dikonfigurasi> 

‘1’ = Receiver RF frequency lock

‘0’= Receiver over RF Frequency not locked

Sedikit[7:2] Daya keluaran RF yang dapat dikonfigurasi> menyimpan

RAM[1]: Function module working state setting, and data serial port rate, dapat dibaca dan ditulis, Defaults is 0X44

Sedikit[7:4]: serial speed

“0000” =1200,

“0001”=2400,

“0010”=4800,

“0011”=9600,

“0100”=19200,

“0101”=38400,

“0110”=57600,

“0111”=115200

“1000”=230400,

“1001”~”1111″= dipesan

Sedikit[3] :Keseimbangan

‘0’=even effect test, 

'1'=efek ajaib

Sedikit[2] :parity switch

‘1’=open

‘0’=close

Sedikit[1]: Receiver module working status

‘1’=Receiver module off

‘0’=Receiver module works normally

Sedikit[0]: Transmitter working status

‘1’=Transmitter module off

‘0’=The transmitter module works normally

RAM[2]: Transmit bandwidth, dapat dibaca dan ditulis, Defaults 0X14,

Divide the corresponding decimal number by10 The bandwidth set for, ranges from20~80, include20（2M Bandwidth) and 80（8M Bandwidth)

other=> menyimpan

RAM[3]~RAM[4]: Transmitter module RF center frequency, readable and writable Defaults RAM[3] = 0X0D, RAM[4] = 0X48

Dalam satuan 100KHz. Nilai maksimumnya adalah 25000 and the minimum value is 500.

RAM[5]: Transmitter module FEC Code rate, dapat dibaca dan ditulis, Defaults 0X00

00 Daya keluaran RF yang dapat dikonfigurasi> 1/2

01 Daya keluaran RF yang dapat dikonfigurasi> 2/3

02 Daya keluaran RF yang dapat dikonfigurasi> 3/4 

03 Daya keluaran RF yang dapat dikonfigurasi> 5/6 

04 Daya keluaran RF yang dapat dikonfigurasi> 7/8 

other=> menyimpan

RAM[6]: Transmitter module modulation mode, dapat dibaca dan ditulis, Defaults 0X00

00 Daya keluaran RF yang dapat dikonfigurasi> QPSK(4QAM) 

01 Daya keluaran RF yang dapat dikonfigurasi> 16QAM

02 Daya keluaran RF yang dapat dikonfigurasi> 64QAM

other=> menyimpan

RAM[7]: Transmitter module guard interval, dapat dibaca dan ditulis, Defaults 0X00

00 Daya keluaran RF yang dapat dikonfigurasi> 1/32

01 Daya keluaran RF yang dapat dikonfigurasi> 1/16 

02 Daya keluaran RF yang dapat dikonfigurasi> 1/8 

03 Daya keluaran RF yang dapat dikonfigurasi> 1/4 

other=> menyimpan

RSAYA[8]: Transmitter module RF Output power attenuation value, dapat dibaca dan ditulis, The default value is0X00

00: 0 dB

01: 1 dB

02: 2 dB; 

………..

0F:15 db

other=> menyimpan

RAM[9]: Receive frequency bandwidth, dapat dibaca dan ditulis, Defaults 0X14

Divide the corresponding decimal number by10 The bandwidth set for, ranges from20~80,include20（2M Bandwidth) and80（8M Bandwidth)

other=> menyimpan

RAM[10]~RAM[11]: receiver module RF center frequency, range 158M to 860M, Readable and writable Defaults RAM[10] = 0X0D, RAM[11] = 0X48

Dalam satuan 100KHz. Nilai maksimumnya adalah 90000 and the minimum value is 2000

RAM[12]~RAM[21]: Receive searched channel parameters, hanya baca, 

struct dibdvbtchannel { 

int8_t spectrum_inversion; 

int8_t nfft; 

penjaga int8_t; 

Constellation int8_t; 

int8_t hrch; 

Int8_t Alpha; 

int8_t code_rate_hp; 

int8_t code_rate_lp; 

int8_t select_hp; 

int8_t intlv_native; 

} DVBT;

RAM[22]~RAM[37]: The encryption key, the readable and writable, Default value is all zeros

RAM[22] :128 bit encryption key[127-120]sedikit

RAM[23] :128 bit encryption key[119-112]sedikit

RAM[24] :128 bit encryption key[111-104]sedikit

RAM[25] :128 bit encryption key[103-96]sedikit

RAM[26] :128 bit encryption key[95-88]sedikit

RAM[27] :128 bit encryption key[87- 80]sedikit

RAM[28] :128 bit encryption key[79-72]sedikit

RAM[29] :128 bit encryption key[71-64]sedikit

RAM[30] :128 bit encryption key[63-56]sedikit

RAM[31] :128 bit encryption key[55-48]sedikit

RAM[32] :128 bit encryption key[47-40]sedikit

RAM[33] :128 bit encryption key[39-32]sedikit

RAM[34] :128 bit encryption key[31-24]sedikit

RAM[35] :128 bit encryption key[23-16]sedikit

RAM[36] :128 bit encryption key[15-8]sedikit

RAM[37] :128 bit encryption key[7-0]sedikit

menjelaskan[127-0]all for0,no encryption

RAM[40]~RAM[43]: For calculating the signal-to-noise ratio, see related documents for details

RAM[44]~RAM[45]: calculate RF power,rf_power Refer to the code for details

RAM[46]~RAM[48]: calculate RF power,n_agc_power Specific reference code

Others RAM Reserved, cannot read or write its contents

3. Perintah Konfigurasi Modul

The configuration command is realized by sending commands to it through the serial port Command format: {+kode op+alamat RAM+<operan>+Periksa kode+} simbol{}inside is ASCII expressed in code16 base number

{: Indicates the start of the command

+: Indicates that only the connection indicated here, for illustration, does not exist in the actual command

<>: Indicates that there is no

}: Indicates the end of the command

kode op: 00 means to write, FF means to read,1 byte RAM address: 1 byte

operan: the operand of the command1 byte, in read operation, This byte does not

check code: (opcode+ deposit address+ <operan>) mod 256

command return format: 

Operation successful return format: {+alamat daftar+nilai daftar+kode cek+} 

reset command did not return

Format pengembalian kegagalan operasi{FFFFFF}

4. referensi metode penghitungan parameter ukuran saluran

Kapasitas saluran maksimum sistem dapat dihitung dengan menggunakan rumus berikut: 

Rmaks=6,75 x b x FEC x (188/204) x (1/(1+GD)) x (BB/8) 

Maks: Kapasitas maksimum saluran(Mb/dtk)

b: Fungsi rasio gelombang kopling,QPSK hour b=2, 16QAM hour b=4，64QAMhourb=6 FEC: tingkat kode koreksi kesalahan internal(1/2, 2/3, 3/4, 5/6, 7/8)

GD: guard interval1/4, 1/8, 1/16, 1/32 

BW: Bandwidth toM as a unit

Sesuai dengan rumus di atas, kapasitas maksimum saluran dapat dihitung berdasarkan beberapa parameter. Seperti yang ditunjukkan pada tabel di bawah ini, yes8mInformation capacity under bandwidth. The system will automatically calculate the size of the coded output stream according to the set channel parameters so that the size of the output stream is not greater than the maximum capacity of the channel.

5. Catatan

on the board L19 location (at U9 On the side, posisinya kosong saat keluar pabrik) can add a 0603 The inductance to increase the output power, the increased inductance value can refer to the following figure

6. Video Operasi