vb.net 发送bytes数据到串口

dim send_bytes(0 to 18) as bytes
dim send_buffer as string
send_bytes(0) = &HAA
send_bytes(1) = &H55
send_bytes(2) = &HD
send_bytes(3) = &H73
send_bytes(4) = &H68
send_bytes(5) = &H69
send_bytes(6) = &H73
send_bytes(7) = &H68
send_bytes(8) = &H69
send_bytes(9) = &H73
send_bytes(10) = &H68
send_bytes(11) = &H75
send_bytes(12) = &H6A
send_bytes(13) = &H75
send_bytes(14) = &H3A
send_bytes(15) = &H31
send_bytes(16) = &H5
send_bytes(17) = &H22
send_buffer = System.Text.Encoding.Default.GetString(send_bytes)
想把send_buffer 发送到串口中 bytes(0)理论是发AA 但是发的不是AA是别的 后面都没问题 这第一位为什么不行么

莫非 7位 数据位？

send_bytes(0) = &HAA
数据位 超过8 bit

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