Hitachi CP-X268AWF User's Manual And Operating Manual page 157

4. Utilize projector – Advanced -
Reply Data format
The connection ID (the data is same as the connection ID data on the sending
data format) is attached to the RS-232C commands reply data.
<ACK reply>
Connection
Reply
ID
0x06 1 byte
<NAK reply>
Connection
Reply
ID
0x15 1 byte
<Error reply>
Reply Error code
0x1C
<Data reply>
Reply
0x1D
<Projector busy reply>
Reply Status code
0x1F
<Authentication error reply>
Authentication
Reply
Error code
0x1F 0x04
78
Connection
2 bytes 1 byte
Connection
Data
2 bytes 1 byte
Connection
2 bytes 1 byte
Connection
0x00 1 byte
ID
ID
ID
ID