Rs-232C Communication - Hitachi ED-X31EP Service Manual

5. RS-232C communication

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6
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CONTROL port
of the projector
Connecting the cable
Turn off the projector and the computer.
1.
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 fulfi lls the
specifi cation shown in the previous page.
Turn the computer on, and after the computer has started up turn the projector
3.
on.
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 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
Action (byte_0 - 1)
Action Classifi cation
1 Set
2 Get
4 Increment
5 Decrement
6 Execute
ED-X31E / ED-X33E (C14B-20)
RS-232C cable (cross)
- (1)
RD (2)
TD (3)
- (4)
GND (5)
- (6)
RTS (7)
CTS (8)
- (9)
byte_2 byte_3
Type
low high
Content
Change setting to desired value.
Read projector internal setup value.
Increment setup value by 1.
Decrement setup value by 1.
Run a command.
(1) CD
(2) RD
(3) TD
(4) DTR
(5) GND
(6) DSR
(7) RTS
(8) DTS
(9) RI
byte_4 byte_5
Setting code
low high
52
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6
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RS-232C port
of the computer