Hitachi CP-X1230CP - Manual (Page 7)

7
RS-232C Communication RS-232C Communication
Connecting The Cable
Turn off the projector and the computer power supplies.
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.
Turn on the computer power supply and after the computer has started up, turn on
the projector power supply.
1
2
3
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
Communications Setting
byte_0 byte_1 byte_2 byte_3 byte_4 byte_5
Action Type Setting code
low high low high low high
Action (byte_0 - 1)
Action Classification Content
1 SET Change setting to desired value.
2 GET Read projector internal setup value.
4 INCREMENT Increment setup value by 1.
5 DECREMENT Decrement setup value by 1.
6 EXECUTE Run a command.