User manual HITACHI CP-X444 TECHNICAL SPECIFICATIONS

[. . . ] Use of some of these modes will not be possible with this projector. · Depending on the input signal, full-size display may not be possible in some cases. Refer to the number of display pixels above. [. . . ] Connect the CONTROL port of the projector with a RS-232C port of 2. the computer by a RS-232C cable (cross). Use the cable that fulfills the specification shown in the previous page. Turn the computer on, and after the computer has started up turn the projector on. Turn off the projector and the computer. 3. Communications setting 19200bps, 8N1 1. Protocol Consist of header (7 bytes) + command data (6 bytes). 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 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. 6 RS-232C Communication (continued) Requesting projector status (Get command) (1) Send the request code Header + Command data (`02H'+`00H'+ type (2 bytes)+ `00H' +`00H') from the computer to the projector. (2) The projector returns the response code `1DH'+ data (2 bytes) to the computer. Changing the projector settings (Set command) (1) Send the setting code Header + Command data (`01H'+`00H'+ type (2 bytes) + setting code (2 bytes)) from the computer to the projector. (2) The projector changes the setting based on the above setting code. (3) The projector returns the response code `06H' to the computer. Using the projector default settings (Reset Command) (1) The computer sends the default setting code Header + Command data (`06H'+ `00H' + type (2 bytes) +`00H'+`00H') to the projector. (2) The projector changes the specified setting to the default value. (3) The projector returns the response code `06H' to the computer. Increasing the projector setting value (Increment command) (1) The computer sends the increment code Header + Command data (`04H'+ `00H'+ type (2 bytes) +`00H'+`00H') to the projector. (2) The projector in creases the setting value on the above setting code. [. . . ] When the data length is greater than indicated by the data length code, the projector ignore the excess data code. Conversely when the data length is shorter than indicated by the data length code, an error code will be returned to the computer. NOTE · Operation cannot be guaranteed when the projector receives an undefined command or data. · Provide an interval of at least 40ms between the response code and any other code. [. . . ]