Just got it in the mail and tried out the RS232 Commands. These are the correct codes for the ones I have tested so far.

Below is some quick and dirty C# code for these commands. Baud Rate 19200, 8 bit, No Parity, 1 bit stop

Byte CalcChecksum(Byte[] buffer,int size)
{
UInt16 checksum = 0x100;
UInt16 sum = 0;
for(int i = 0; i < size; i++)
{
sum += buffer[i];
}

return (Byte)((checksum - sum) & 0xFF);
}

private void btnBeep_Click(object sender, EventArgs e)
{
// Turn off Beep
Byte[] buffer = {0xA5,0x5B,0x06,0x01,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};

buffer[12] = CalcChecksum(buffer,12);

serialPort.Write(buffer,0,buffer.Length);
}

private void btnBeepOn_Click(object sender, EventArgs e)
{
// Turn on Beep
Byte[] buffer = { 0xA5, 0x5B, 0x06, 0x01, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

buffer[12] = CalcChecksum(buffer, 12);

serialPort.Write(buffer, 0, buffer.Length);
}

private void btnOutCInC_Click(object sender, EventArgs e)
{
// Change Out 3 to Input 3

Byte[] buffer = { 0xA5,
0x5B,
0x02,
0x03,
0x03, // Input Port (0x01 - 0x04)
0x00,
0x03, // Output Port (0x01 - 0x04)
0x00,
0x00,
0x00,
0x00,
0x00,
0x00 };

buffer[12] = CalcChecksum(buffer, 12);

serialPort.Write(buffer, 0, buffer.Length);
}

• Reply
• Porter L on Feb 8, 2017

The codes in the Command_codes_for_LINDY_38152 doc do in fact work. There's a python implementation of the spec at github dot com /seanwatson/hdmi-matrix-controller

• Reply
• New User U on May 7, 2017

The sources are all unique. Yes, there are several ways I can do it and am doing it but I was just hoping for some simplicity. An 8 in and 2 or more out switch would be great but that's out of budget.

Thanks John

• Reply
• New User U on Aug 17, 2018