Atlona AT PC81A - Manual (Page 8)

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Serial String Mode
First byte Transmission data amount (from 1 st byte to last byte)
0x53 Check code
0x57 Check code
0x90 Check code
0x08 Check code
0xff *Machine number
0x01 Command ID
….. Command parameters
Last byte Check sum (add from first byte to command parameters)
(a) Set Command:
Command Code Response Function
DATA *Check Sum ACK SET
0x09 0x53 0x57 0x90 0x08 0xff 0x02
*0x01~0x08 *0x4d~0x54 0xaa Select input source
0x09: Command length
0x53 0x57 0x90 0x08: Check code
0xff :Machine number
0x02: Command ID
0x01~0x08: Selected input on AT-PC81A
0x4d~0x54: Check sum
ACK
0xaa: Header
0x09 0x53 0x57 0x90 0x08 0xff 0x07
0x01 0x52 0xaa Set auto detect function
0x09: Command length
0x53 0x57 0x90 0x08: Check code
0xff :Machine number
0x07: Command ID
0x01/0x00: Enable/disable auto detect
function
0x52: Check sum
ACK
0xaa: Header