Atlona AT-HD88M-SR - Manual (Page 16)

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Method C: Software Control through RS-232 serial port
Software Control Menu
1. Scan button:
Serial Port Scan:
Press Scan button, the machine will scan the all com port and show them.
Select the RS-232 serial port connected to the machine. And set device ID 255 is for all device.
Only the same device ID or 255 can get the command you sent.
Press OK to get the new status from the machine you select.
Input &
Source indicator
Output port
Status Indicator