![Nec MultiSync V801 [11/73] Header message check code delimiter](/img/pdf.png)
Nec MultiSync V801 [11/73] Header message check code delimiter
![Nec MultiSync V801 [11/73] Header message check code delimiter](/views2/1375596/page11/bgb.png)
(11/73)
4.3 Check code
Check code is the Block Check Code (BCC) between the Header and the End of Message except SOH.
D
n+1
= D
1
XOR D
2
XOR D
3
XOR ,,, D
n
XOR: Exclusive OR
Following is an example of a Check code (BCC) calculation.
Check code (BCC) D
17
= D
1
xor D
2
xor D
3
xor … xor D
14
xor D
15
xor D
16
= 30h xor 41h xor 30h xor 45h xor 30h xor 41h
xor 02h xor 30h xor 30h xor 31h xor 30h xor 30h
xor 30h xor 36h xor 34h xor 03h
= 77h
Header
Message
Check code
Delimiter
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
SOH D
0
Reserved D
1
Destination D
2
Source D
3
Type D
4
Length(H) D
5
Length(L) D
6
STX D
7
Data D
8
| |
| |
ETX D
n
Check code D
n+1
P P P P P P P P
Header Message
Check
code
(BCC)
Delimiter
SOH
Reserved
Destination
Address
Source
Address
Message
type
Message length STX
OP code
page
OP code Set Value ETX
01
30 41 30 45 30 41 02 30
30
31
30
30
30
36
34
03 77 0D
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
8
D
9
D
10
D
11
D
12
D
13
D
14
D
15
D
16
D
17
D
18
Содержание
- External control nec lcd monitor 1
- I application 3
- Connectors and wiring 4
- Ii preparation 4
- Lan control 4
- Rs 232c remote control 4
- Communication parameter 5
- Communication timing 5
- Iii communication specification 5
- Lan control 5
- Rs 232c remote control 5
- Command 6
- Command reply 6
- Communication format 6
- Get parameter 6
- Get parameter reply 6
- Monitor controller 6
- Save current setting command 6
- Save current setting command reply 6
- Set parameter 6
- Set parameter reply 6
- Header block format fixed length 7
- Header message check code delimiter 7
- Header message check code delimiter 9
- Message block format 9
- Check code 11
- Header message check code delimiter 11
- Delimiter 12
- Header message check code delimiter 12
- And 32h 13
- Get current parameter from a monitor 13
- Message type 13
- Get parameter reply 14
- Set parameter 15
- Set parameter reply 16
- Commands 17
- Save current settings 17
- Get timing report and timing reply 18
- Null message 19
- How to change the backlight setting 20
- Iv control commands 20
- Typical procedure example 20
- How to read the measurement value of the built in temperature sensors 23
- Operation code op code table 26
- Pictu re 26
- Adjus t 27
- Audi o 29
- Schdu le 29
- Multi display 31
- Advan ced option 33
- Displ ay protection 33
- Carbo n footprint 36
- Senso r 36
- Tempe rature 36
- Power control procedure 37
- Power status read 37
- Power control 39
- The controller requests the monitor to control monitor power 39
- Asset data read and write 41
- Asset data read request and reply 41
- Asset data write 43
- Date time read 45
- Date time read and write 45
- Date time write 47
- The controller requests the monitor to write date time 47
- This command is used in order to write the setting of the date time 47
- Schedule read and write 50
- This command is used in order to read the setting of the schedule 50
- Following command also can be used for to keep backward compatibility in order to 53
- Read the setting of the schedule 53
- Schedule write 55
- The controller requests the monitor to write schedule 55
- This command is used in order to write the setting of the schedule 55
- The controller requests the monitor to write enable disable schedule 58
- Following command also can be used for to keep backward compatibility in order to 61
- The controller requests the monitor to write schedule 61
- Write the setting of the schedule 61
- The controller requests the monitor to write enable disable schedule 63
- Self diagnosis 65
- This command is used in order to read the self diagnosis status 65
- Serial no model name read 67
- Serial no read 67
- This command is used in order to read a serial number 67
- Model name read 68
- This command is used in order to read the model name 68
- Security lock 69
- Security lock control 69
- This command sets the condition of security lock function to lock or unlock if security pass codes 1st to 4th are matched with monitor resisted pass codes then this command is executed and reply no error status and a new condition if codes aren t matched with them then setting isn t changed and reply error status and a current condition if the monitor receives this command while waiting for pass codes inputs then it only checks pass cords and releases image muting if pass codes are ok and doesn t apply en parameter 69
- Direct tv chanel read reply 71
- Direct tv chanel read write 71
- Is read and write directly 71
- When dtv unit option unit is installed channel settin 71
- Direct tv chanel write reply 72
- All data are subject to change without notice 73
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