62
RS-232C Adjustment Mode
Check sum, error processing, ACK
The received data is checked using both the following
check sum and the RS232C parity (odd).
1) Lower 8bits of the total of command1 of the send/re-
ceive1 frame, unit ID1, 2, command2, data length, and
data.
Total 208H
DFH
Command1
80H
Unit ID1
60H
Unit ID2
47H
Command2
01H
Data length
01H
Data
08H
Check sum
2) Error processing
1
If the communication interval is 4ms or longer, it is
confirmed that command1 will come later. If it is
impossible to confirm that there are significant data
at that time, this data is not confirmed.
2
ACK is not returned if neither a receive data error,
check sum error, nor received data could be entered.
3
If ACK is not returned from the receiving side after
transmission of data by the transmitting side, the
transmitting side retransmits the data up to three
times.
If ACK is not returned from the receiving side after
the data has been transmitted three time, it is “NO
CONNECT”.
The waiting time for ACK after data transmission is
1.5 seconds for the master and 2.0 seconds for the
slave.
And when ACK 1 (during command processing) with
bit 3 of command 1 as “0” has been received, trans-
mitting side waits 2.0 seconds for the next ACK with-
out retransmitting the command.
Method of controlling the set based on the set ID
When multiple plasma displays are controlled, it is possible
to control them separately by using commands using the
setID.
The following is an example of the POWER ON command
for a plasma display with ID set as 5.
POWER ON command for all sets regardless of ID
9F
80
60
4E
00
CD
In the ID = “5” case. (value of ID -1 is set. “4”)
9D
84
60
4E
00
CF
The following is an example of switching between single
mode that consists of a four screen multi-system and multi
mode.
The ID of the set that is the master is 50, and it is
hypothesized that ID are allotted based on AUTO ID for
each set. The following are the ID allotted to each set.
Upper left set (master) ID = 50 = 32h
Upper right setID = 51 = 33h
Lower right setID = 52 = 35h
Lower left setID = 53 = 35h
Transmission commands
DD
81
63
03
03
03
01
00
CB
DD
82
63
03
03
03
02
00
CD
DD
83
63
03
03
03
03
00
CF
DD
84
63
03
03
03
04
00
D1
If the above commands are transmitted, 4-screen multi
SPLIT display is shown.
To change the 4-screen multi display to single mode display,
issue the following command.
DF
80
60
03
03
01
01
00
C7
The above command changes all sets to single mode
display.
This command changes acts on all sets because a setID
has not been stipulated.
There are cases where, according to the method used to
connect to the external control apparatus, ID based control
is impossible.
