Hitachi ED-S3170A User Manual page 46

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.
Control jack
D-sub 15-pin shrink jack
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
byte_0
low
Action Classification
1 SET
2 GET
4 INCREMENT
5 DECREMENT
6 EXECUTE
Projector
1
2
3
4
5
6
SELO
RTS 7
8
9
GND 10
11
12
13
RD
14
TD
15
Command data chart
byte_1 byte_2
Action Type
high low
Action (byte_0 - 1)
Change setting to desired value.
Read projector internal setup value.
Increment setup value by 1.
Decrement setup value by 1.
Run a command.
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Computer RS-232C jack
1 D-sub 9-pin
CD
2
RD
3
TD
1
4
DTR
5
GND 6
6
DSR
7
RTS
8
DTS
9
RI
byte_3 byte_4 byte_5
Setting code
high low high
Content
2 3 4 5
7 8 9
5