Hitachi CP-SX5500W, Service Manual

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83
CP-SX5500W
13. RS-232C communication
(1) Turn off the projector and computer power supplies and connect with the RS-232C cable.
(2) Turn on the computer power supply and, after the computer has started up, turn on the projector power supply.
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Control terminal
D-sub 15-pin shrink
Projector Computer
Communications setting
19200bps, 8N1
1 Protocol
Consist of header (7 bytes) + command data (6 bytes).
2 Header
BE + EF + 03 + 06 + 00 + C CRC_high.
CRC_low : Lower byte of CRC fl ag for command data.
CRC_high : Upper byte of CRC fl ag for command data.
3 Command data
Command data chart
byte_0 byte_1
Action
low high
byte_2 byte_3
Type
low high
byte_4 byte_5
Setting code
low high
Action Classification Content
Action (byte_0 - 1)
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.
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RD
TD
GND
SELO
RTS
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CD
RD
TD
DTR
GND
DSR
RTS
DTS
RI
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RS-232C terminal
D-sub 9-pin