Command Format - Hitachi CPX305 - XGA LCD Projector Network Manual

Command Format

Command formats differ among the different communication ports.
● TCP #23
You can use the RS-232C commands without any changes. The reply data
format is the same as the RS-232C commands. However, the following reply
will be sent back in the event of authentication failure when authentication is
enabled.
<Reply in the event of an authentication error>
Reply Error code
0x1F 0x04
● TCP #9715
Send Data format
The following formatting is added to the header (0x02), Data length (0x0D),
Checksum (1byte) and Connection ID (1 byte) of the RS-232C commands.
Data
Header
length
0x02 0x0D
Header
Data length
RS-232C commands → RS-232C commands that start with 0xBE 0xEF (13 bytes)
Check Sum
Connection ID
0x00
RS-232Ccommand
13 bytes
→ 0x02, Fixed
→ RS-232C commands byte length (0x0D, Fixed)
→ This is the value to make zero on the addition of the
lower  bits from the header to the checksum.
→ Random value from 0 to 255 (This value is attached to
the reply data)
Command Control via the Network
Checksum
 byte
Connection
ID
 byte
33