Protocolo de control de comunicación del módulo Ethernet Mini_COFDM Vcan1886
Tabla de contenido
1. Parámetros del puerto serie de control de comunicación
8 bits de datos
1 bit de parada
paridad par
velocidad de transmisión: 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. Después de que el sistema se enciende o reinicie, El puerto serie se imprimirá {AAAAA}
Descripción del parámetro RAM
RAM[0]: Control de reinicio del sistema, Lecible y WRITITY, Reading and writing represent different meanings:
Escribir
00 Punto central de frecuencia operativa> Reset the whole system, Serial returns {AAAAA}, indicando que el sistema ha sido reiniciado
01 Punto central de frecuencia operativa> Guardar los parámetros establecidos por el usuario, Serial returns {000101}, indicates successful execution
02 Punto central de frecuencia operativa> Restore parameters to system default parameters, Serial returns {000202}, indicando una ejecución exitosa
03Punto central de frecuencia operativa> Buscar el punto de frecuencia del ancho de banda especificado. El puerto de serie regresa {000303}, indicates successful execution
04Punto central de frecuencia operativa> Search for the specified frequency when the parameters are known, devolver {000404}, indicates successful execution
05Punto central de frecuencia operativa> reloadkey, Serial port parameter setting of transmitting parameters and data serial port, returns {000505}, indicates successful execution
06Punto central de frecuencia operativa> 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),
devolver{000606},Indicates successful execution
other=> reservar
leer:
Poco[0] Punto central de frecuencia operativa>
‘1’ = Transmitter RF frequency lock
‘0’= Transmitter RF Frequency not locked
Poco[1] Punto central de frecuencia operativa>
‘1’ = Receiver RF frequency lock
‘0’= Receiver over RF Frequency not locked
Poco[7:2] Punto central de frecuencia operativa> reservar
RAM[1]: Function module working state setting, and data serial port rate, Lecible y WRITITY, Defaults is 0X44
Poco[7:4]: serial speed
“0000” =1200,
“0001”=2400,
“0010”=4800,
“0011”=9600,
“0100”=19200,
“0101”=38400,
“0110”=57600,
“0111”= 115200
“1000”=230400,
“1001”~”1111″= reservado
Poco[3] :Paridad
‘0’=even effect test,
‘1’ = efecto milagroso
Poco[2] :parity switch
‘1’=open
‘0’=close
Poco[1]: Receiver module working status
‘1’=Receiver module off
‘0’=Receiver module works normally
Poco[0]: Transmitter working status
‘1’=Transmitter module off
‘0’=The transmitter module works normally
RAM[2]: Transmit bandwidth, Lecible y WRITITY, Defaults 0X14,
Divide the corresponding decimal number by10 The bandwidth set for, ranges from20~80, include20(2M Bandwidth) and 80(8M Bandwidth)
other=> reservar
RAM[3]~ Ram[4]: Transmitter module RF center frequency, readable and writable Defaults RAM[3] = 0X0D, RAM[4] = 0X48
En unidades de 100KHz. El valor máximo es 25000 and the minimum value is 500.
RAM[5]: Transmitter module FEC Code rate, Lecible y WRITITY, Defaults 0X00
00 Punto central de frecuencia operativa> 1/2
01 Punto central de frecuencia operativa> 2/3
02 Punto central de frecuencia operativa> 3/4
03 Punto central de frecuencia operativa> 5/6
04 Punto central de frecuencia operativa> 7/8
other=> reservar
RAM[6]: Transmitter module modulation mode, Lecible y WRITITY, Defaults 0X00
00 Punto central de frecuencia operativa> QPSK(4QAM)
01 Punto central de frecuencia operativa> 16QAM
02 Punto central de frecuencia operativa> 64QAM
other=> reservar
RAM[7]: Transmitter module guard interval, Lecible y WRITITY, Defaults 0X00
00 Punto central de frecuencia operativa> 1/32
01 Punto central de frecuencia operativa> 1/16
02 Punto central de frecuencia operativa> 1/8
03 Punto central de frecuencia operativa> 1/4
other=> reservar
RA.M[8]: Transmitter module RF Output power attenuation value, Lecible y WRITITY, The default value is0X00
00: 0 dB
01: 1 dB
02: 2 dB;
………..
0F:15 db
other=> reservar
RAM[9]: Receive frequency bandwidth, Lecible y WRITITY, Defaults 0X14
Divide the corresponding decimal number by10 The bandwidth set for, ranges from20~80,include20(2M Bandwidth) and80(8M Bandwidth)
other=> reservar
RAM[10]~ Ram[11]: receiver module RF center frequency, range 158M to 860M, Readable and writable Defaults RAM[10] = 0X0D, RAM[11] = 0X48
En unidades de 100KHz. El valor máximo es 90000 and the minimum value is 2000
RAM[12]~ Ram[21]: Receive searched channel parameters, de solo lectura,
struct dibdvbtchannel {
int8_t Spectrum_Inversion;
int8_t nfft;
INT8_T Guard;
Constellation int8_t;
int8_t hrch;
int8_t alfa;
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]poco
RAM[23] :128 bit encryption key[119-112]poco
RAM[24] :128 bit encryption key[111-104]poco
RAM[25] :128 bit encryption key[103-96]poco
RAM[26] :128 bit encryption key[95-88]poco
RAM[27] :128 bit encryption key[87- 80]poco
RAM[28] :128 bit encryption key[79-72]poco
RAM[29] :128 bit encryption key[71-64]poco
RAM[30] :128 bit encryption key[63-56]poco
RAM[31] :128 bit encryption key[55-48]poco
RAM[32] :128 bit encryption key[47-40]poco
RAM[33] :128 bit encryption key[39-32]poco
RAM[34] :128 bit encryption key[31-24]poco
RAM[35] :128 bit encryption key[23-16]poco
RAM[36] :128 bit encryption key[15-8]poco
RAM[37] :128 bit encryption key[7-0]poco
ilustrar[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. Comando de configuración del módulo
The configuration command is realized by sending commands to it through the serial port Command format: {+Opcode+dirección RAM+<operando>+Verifique el código+} símbolo{}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
código de operación: 00 means to write, FF means to read,1 byte RAM address: 1 byte
operando: the operand of the command1 byte, in read operation, This byte does not
check code: (opcode+ deposit address+ <operando>) moderno 256
command return format:
Operation successful return format: {+Dirección de registro+Valor de registro+Código de verificación+}
reset command did not return
Formato de devolución de falla de operación{Ffffff}
4. referencia del método de cálculo del parámetro del tamaño del canal
La capacidad máxima del canal del sistema se puede calcular usando la siguiente fórmula:
Rmáx=6,75 x b x FEC x (188/204) x (1/(1+GD)) x (BW/8)
Rmáx: La capacidad máxima del canal.(MB/s)
segundo: Función de relación de onda de acoplamiento,QPSK hour b=2, 16QAM hour b=4,64QAMhourb=6 FEC: tasa de código de corrección de errores internos(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
De acuerdo con la fórmula anterior, la capacidad máxima del canal se puede calcular bajo algunos parámetros. Como se muestra en la tabla a continuación, 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. Nota
on the board L19 location (at U9 On the side, la posición está vacía al salir de fábrica) can add a 0603 The inductance to increase the output power, the increased inductance value can refer to the following figure
Inalámbrica de transmisión de vídeo
300-500Transceptor MHZ COFDM IP RJ45 con antena de filtro PA de 10 W


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