Hitachi CP-WX11000 Service Manual page 75

Daisy Chain Communication
Daisy Chain Communication
Transmitting side
1 2 3 4 5
6
7 8 9
CONTROL OUT port RS-232C cable (Cross)
in Projector
- (1)
RD (2)
TD (3)
- (4)
GND (5)
- (6)
RTS (7)
CTS (8)
- (9)
1.Communications setting
Set the same communication settings (selecting from options below) on the
CONTROL terminal for transmitting and receiving side connected with a RS-232C
cable.
Baud rate: 4800 / 9600 / 19200 / 38400 bps
Parity NONE / ODD / EVEN
Data bit: 8 bit (fixed)
Start bit: 1 bit (fixed)
Stop bit: 1 bit (fixed)
2.Commans available only for daisy chain
communication
The projector supports the following commands only for daisy chain.
(1) Control the projector (Set/Increment/Decrement/Execute)
(2) Get the projector's status (Get)
(3) Get the number of connected projectors
(4) Set the communication Group identification and Communication ID.
(5) Get the communication Group identification and Communication ID.
3.Command format
Protocol
Consist of header data (7 bytes) + command data (6 bytes)
Header
BE + EF + Packet_Type + 06 + Group + ID + Checksum
Data chart
Support Command
Control the projector
Get the projector's status
Get the number of connected projectors
Set the communication Group
identification and Communication ID
Get the communication Group
identification and Communication ID
Recieving side
1 2 3 4 5
6
7 8 9
CONTROL IN
port in Projector
(1) CD
(2) RD
(3) TD
(4) DTR
(5) GND
(6) DSR
(7) RTS
(8) DTS
(9) RI
Packet_Type Group ID
'83H' 0~16 0~64
'83H' 1~16 1~64
'84H' 0 0
'85H' 1~16 1~64
'86H' 0 0
Calculation of Checksum
Sum up all of 12 bytes except the Checksum, then make the bit inversion of the
lowest byte of the total, and add 1 to the inverted byte. The calculated result is
the Checksum data.
Exp. Communication Group: A / Communication ID: 1
Header data (7 bytes)
Header Packet Data Size Group ID
Type
BE EF 83 06 01 01
BE + EF + 83 + 06 + 01 + 01 + 01 + 00 + 00 + 60 + 01 + 00 = '029AH'
The lowest byte of '029AH' is '9AH' (1001 1010). Making the bit inversion of the
'9AH' gets '65H' (0110 0101), then, add 1. The calculated checksum is '66H'.
Group and ID Settings
This daisy chain command can adjust the control range by using the Group
identification and ID.
Group ID Direction
1~16 1~64 Individual control The command is available to the projectors having
the same Group identification and ID numbers with
command setting.
1~16 0 Designated control The command is available to the projectors having
according to the the same Group identification with command setting.
Group identification
0 1~64 Designated control The command is available to the projectors having
according to the ID the same ID number with command setting.
0 0 Unlimited. The command is available to the all projectors.
Daisy Chain Communication
Command data (6 bytes)
Checksum Action Type Setting
Code
66 01 00 00 60 01 00
note