Rs-232C Communication - Hitachi CP-X2520 Service Manual

RS-232C Communication

When the projector connects to the computer by RS-232C communication, the
projector can be controlled with RS-232C commands from the computer.
For details of RS-232C commands, refer to RS-232C Communication command
table.
Connection
Turn off the projector and the computer.
1.
Connect the projector's CONTROL port and the computer's RS-232C port
2.
with a RS-232C cable (cross). Use the cable that fulfi lls the specifi cation
shown in fi gure.
Turn the computer on, and after the computer has started up turn the projector
3.
on.
RS-232C
RS-232C Cable
(cross)
RS-232C port
of the computer
9 8 7 6
5 4 3 2 1
CD (1)
RD(2)
TD (3)
DTR (4)
GND (5)
DSR (6)
RTS (7)
DTS (8)
RI (9)
CONTROL
CONTROL port
of the projector
9 8 7 6
5 4 3 2 1
(1) −
(2) RD
(3) TD
(4) −
(5) GND
(6) −
(7) RTS
(8) CTS
(9) −
Communication settings
1. Protocol
19200bps,8N1
2. Command format ("h" shows hexadecimal)
Byte Number 0 1 2 3
Command Header
Header Data
code size
Packet
Action
L H L
<SET>Change setting to
desired value [(cL)(cH)]
by [(eL)(eH)].
<GET>Read projector
internal setup value [(bL)
(bH)] .
<INCREMENT>
BEh EFh 03h 06h 00h
Increment setup value
[(bL)(bH)] by 1.
<DECREMENT>
Decrement setup value
[(bL)(bH)] by 1.
<EXECUTE> Run a
command [(bL)(bH)].
[Header code], [Packet], [Data size]
Set [BEh, EFh, 03h, 06h, 00h] to byte number 0 ~ 4.
[CRC flag]
5, 6, RS-232C Communication command table
For byte number refer to
[Action]
Set functional code to byte number 7, 8.
<SET> = [01h, 00h], <GET> = [02h, 00h], <INCREMENT> = [04h, 00h]
<DECREMENT> = [05h, 00h], <EXECUTE> = [06h, 00h]
Refer to the command table above.
[Type], [Setting code]
9 〜 12 RS-232C Communication command table
For byte number , refer to
RS-232C Communication (continued)
4 5 6 7 8 9 10 11 12
Data
CRC Setting
Action Type
flag code
H L H L H L H L H
(aL) (aH) 01h 00h (bL) (bH) (cL) (cH)
(aL) (aH) 02h 00h (bL) (bH) 00h 00h
(aL) (aH) 04h 00h (bL) (bH) 00h 00h
(aL) (aH) 05h 00h (bL) (bH) 00h 00h
(aL) (aH) 06h 00h (bL) (bH) 00h 00h
.
.