Atlona AT PC81A - Manual (Page 9)

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Command Code Response Function
DATA *Check Sum ACK SET
0x08 0x53 0x57
0x90 0x08 0xff 0x01 0x4a 0xaa 0x03
0xN1 0xN4 Read selected source and auto detect status
0x08: Command length
0x53 0x57 0x90 0x08: Check code
0xff : Machine number
0x01: Command ID
0x4a: Check sum
ACK
0xaa: Header
0x03: Command length
0xN1: N = 1 or 0. (1: Auto detect on / 0: Auto detect off)
0x08 0x53 0x57
0x90 0x08 0xff 0x03 0x4c 0xaa 0x03
0xM 0xM+3 Read input status
0x08: Command length
0x53 0x57 0x90 0x08: Check code
0xff :Machine number
0x03: Command ID
0x4c: Check sum
ACK
0xaa: Header
0x03: Command length
0xM: Input signal mapping (bit0: input one / bit1: input two /
bit2: input three / bit3: input four / bit4: input five /
bit5: input six / bit6: input seven / bit7: input eight /
1: signal is on / 0:signal is off)
for example: 0x71 (input 1, 5, 6, 7 are existed [0111│0001])
0xM+3: Check sum
0x08 0x53 0x57
0x90 0x08 0xff 0x04 0x4d 0xaa 0x03
0xff 0x02 Read machine number
0x08: Command length
0x53 0x57 0x90 0x08: Check code
0xff :Machine number
0x04: Command ID
0x4d: Check sum
ACK
0xaa: Header
0x03: Command length
0xff: Machine number
0x02: Check sum
0x05 0x4d 0x4f 0x44 0xe5 0xaa 0x06
0x53 0x57
0x90 0x04
0x48 READ CHECK CODE
Read the device check code of the AT-PC-81A.
Format:
0x05 Transmission data amount
0x4d Check code
0x4f Check code
0x44 Check code
0xe5 Check sum
ACK
0xaa: Header
0x06 Command length
0x53 Check code
0x57 Check code
0x90 Check code
0x08 Check code
0x48 Check Sum