Modify DVB-T2 transmitter’ parameters via serial port

How to write commands to modify the parameters of the DVB-T2 transmitter through the serial port?

The following method is suitable for this product.

Module configuration parameters

The module configuration parameters are all realized by writing a 256×8 RAM inside the module. The parameters controlling the serial port are 19200, 8-bit data, checksum, and 1 stop bit.

RAM parameter description

The module configuration parameters are all implemented by writing to a 256×8 RAM inside the module. The configured parameters are valid after saving reset or powering on again. After the system is powered on or reset, the serial port will print {AAAAAA}

RAM parameter description

RAM[0]: System reset control, readable and writable, reading and writing have different meanings

        Write:

00 => Reset the entire system, the serial port returns {AAAAAA}, indicating that the system has been reset.

01=> Save 256 RAM values, and the serial port returns {000101}, indicating successful execution.

02=>Restore the value of 256 RAM to the system default initial value, and the serial port returns {000202}, indicating execution.

success

           03 => Search for the frequency point of the specified bandwidth. The serial port returns {000303}, indicating that the execution is successful.

           04 => IP-related parameter configuration takes effect, and the serial port returns {000404}, indicating successful execution.

           Others => Reserved

           read::

          Bit[7:4]: reserved

          Bit[3] network port connection rate, only meaningful when Bit[2]=‘1’

                     ‘0’:100M

                     ‘1’:1000M

          Bit[2] network port connection status

                     ‘0’: The network port is not connected

                     ‘1’: Network port connection

          Bit[1]: Main EW300 frequency lock indication

  ‘1’=frequency lock

  ‘0’=frequency not locked

          Bit[0]: Frequency lock indication from EW300

  ‘1’=frequency lock

  ‘0’=frequency not locked

RAM[1]~RAM[3]: Specified frequency point, in KHz, readable and writable, RAM[1] is the high bit, range (100M~860M)

RAM[4]: bandwidth of frequency point,

         08 => 8M

         07 => 7M

         06 => 6M

         05 => 5M

         01 => 1.7M

RAM[5]~RAM[8]:local IP address,Readable.

Default value: 192(RAM[5]).168(RAM[6]).1(RAM[7]).100(RAM[8])

RAM[9]~RAM[14]: local MAC address, readable and writable.

               Default value: 98-8D-46-0E-61-87

RAM[15]~RAM[16]：UDP source port number, readable and writable, default 6000, RAM[15] is the high byte.

RAM[17]~RAM[18]：UDP destination port number, readable and writable, defaults to 6001, RAM[17] is the high byte.

RAM[19]~RAM[22]：UDP destination host IP address, address format: RAM[19].RAM[20].RAM[21].RAM[22]. Readable and writable, default value 192.168.1.110

                   If it is a multicast address, the range is 239.0.0.0~239.255.255.255.

RAM[23]:Empty packets are deleted, default is 0x00,

                   00: Do not delete empty packages

                   Others: delete empty packages

RAM[24]~RAM[63]: reserved

RAM[64]~RAM[65]: MASTER SNR

RAM[66]~RAM[67]: SLAVE SNR

RAM[68]~RAM[69]: MASTER RFLEVEL /div8

RAM[70]~RAM[71]: SLAVE RFLEVEL /div8

RAM[72]~RAM[74]: MASTER FBER,MSB(RAM[72]) = 1

RAM[80]:The next OFDM PRAMETER RAM is valid mark,read only

        0: No valid

        1: valid 

RAM[81]: read only

  BIT[5]  0:Not mixed

1:Mixed

   BIT[4] 0: SISO

1:MISO

   BIT[2:0] 0:2K

1:8K

2:4K

3:1K

4:16K

5:32K

RAM[82]: read only

   BIT[6:4] 0:1/32

1:1/16

2:1/8

3:1/4

4:1/128

5:19/128

6:19/256

BIT[2:0]  0:PP1

1:PP2

2: PP3

3:PP4

4:PP5

5:PP6

6:PP7

7:PP8

RAM[83]: read only

    BIT[4]    0:Normal

1:Extended

BIT[2:0] PAPR MODE

RAM[84]~RAM[85]: Number of data symbols in a T2 frame,RAM[84] high byte, RAM[85] low byte, read only

Other RAM is reserved and its contents cannot be read or written.

1. Module configuration commands

Configuration commands are implemented by sending commands to it through the serial port.

    Command format: {+opcode+RAM address+<operand>+check code+} The symbols {} are all hexadecimal numbers represented by ASCII codes.

           { : indicates the start of the command

           +: Indicates that this only represents the connection, which is used for illustration and does not exist in the actual command.

           <>: Indicates that the parameter is not included in the read command.

           } : indicates the end of the command

           Opcode: 00 means write, FF means read, 1 byte

           RAM address: 1 byte

           Operand: The operand of the command is 1 byte. In the read operation, this byte has no

           Check code: (opcode + storage address + <operand>) mod 256

Command return format:

           The return format if the operation is successful: {+register address+register value+check code+}

                            The reset command did not return

           Operation failure return format: {FFFFFF}

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