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byte[] commandBuffer;
int cmdBytes;
...
commandBuffer[1] = (byte) ((cmdBytes >> 16) & 0x000000ff);
commandBuffer[2] = (byte) ((cmdBytes >> 8 ) & 0x000000ff);
commandBuffer[3] = (byte) (cmdBytes & 0x000000ff);

 
commandBuffer[47] = 0xfc;