Hitachi X1250 Technical Operating Manual - Page 7

RS-232CCommunication Connecting The Cable 1 Turn off the projector and the computer power supplies. 2 Connect the CONTROL port of the projector with a RS-232C port of the computer by a RS-232C cable. Use the cable that fulfills the specification shown in the previous page. 3 Turn on the computer power supply and after the computer has started up, turn on the projector power supply. Communications Setting 19200bps, 8N1 1. Protocol Consist of header (7 bytes) + command data (6 bytes). 2. Header BE + EF + 03 + 06 + 00 + CRC_low + CRC_high CRC_low : Lower byte of CRC flag for command data CRC_high : Upper byte of CRC flag for command data 3. Command data Command Data Chart byte_0 byte_1 byte_2 byte_3 Action Type low high low high byte_4 byte_5 Setting code low high Action (byte_0 - 1) Action Classification 1 SET 2 GET 4 INCREMENT 5 DECREMENT 6 EXECUTE Content Change setting to desired value. Read projector internal setup value. Increment setup value by 1. Decrement setup value by 1. Run a command. 7