NEC MultiSync C431 User manual

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External Control NECLCDMonitor
Rev.1.0(G5)
INDEX
I.Application............................................................................................................................................. 4
II. Preparation........................................................................................................................................... 5
2. Connectors and wiring......................................................................................................................... 5
2.1 RS-232C Remote control.................................................................................................................... 5
2.2 LAN control......................................................................................................................................... 5
III. Communication specification ............................................................................................................ 6
3. Communication Parameter.................................................................................................................. 6
3.1 RS-232C Remote control.................................................................................................................... 6
3.2 LAN control......................................................................................................................................... 6
3.3 Communication timing....................................................................................................................... 6
4. Communication Format........................................................................................................................ 7
4.1 Header block format (fixed length)................................................................................................... 8
4.2 Message block format...................................................................................................................... 10
4.3 Check code....................................................................................................................................... 12
4.4 Delimiter ........................................................................................................................................... 12
5. Message type...................................................................................................................................... 13
5.1 Get current Parameter from a monitor. .......................................................................................... 13
5.2 "Get parameter" reply...................................................................................................................... 14
5.3 Set parameter................................................................................................................................... 16
5.4 "Set parameter" reply ...................................................................................................................... 17
5.5 Commands ........................................................................................................................................ 18
5.5.1 Save Current Settings................................................................................................................... 18
5.5.2 Get Timing Report and Timing reply. ........................................................................................... 19
5.5.3 NULL Message............................................................................................................................... 20
IV. Control Commands ........................................................................................................................... 21
6. Typical procedure example ............................................................................................................... 21
6.1. How to change the “Backlight”setting. ........................................................................................ 21
6.2. How to read the measurement value of the built-in temperature sensors.................................. 24
6.3. Operation Code (OP code) Table.................................................................................................... 27
7. Power control procedure ................................................................................................................... 37
7.1 Power status read ............................................................................................................................ 37
7.2 Power control ................................................................................................................................... 39
8. Asset Data read and write................................................................................................................. 41
8.1 Asset Data Read Request and reply................................................................................................ 41

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8.2 Asset Data write............................................................................................................................... 42
9. Date & Time read and write............................................................................................................... 44
9.1 Date & Time Read ............................................................................................................................ 44
9.2 Date & Time Write............................................................................................................................ 46
10. Schedule read and write.................................................................................................................. 49
10.1 Schedule Read................................................................................................................................ 49
10.2 Schedule Write ............................................................................................................................... 52
11. Holiday read and write..................................................................................................................... 58
11.1 Holiday Read................................................................................................................................... 58
11.2 Holiday Write .................................................................................................................................. 60
12. Weekend read and write.................................................................................................................. 63
12.1 Weekend Read................................................................................................................................ 63
12.2 Weekend Write................................................................................................................................ 65
13. Self diagnosis ................................................................................................................................... 67
13.1 Self-diagnosis status read ............................................................................................................. 67
14. Serial No. & Model Name Read ....................................................................................................... 69
14.1 Serial No. Read............................................................................................................................... 69
14.2 Model Name Read .......................................................................................................................... 71
15. Security Lock.................................................................................................................................... 73
15.1 Security Lock Control .................................................................................................................... 73
16. Daylight Saving read & write........................................................................................................... 75
16.1 Daylight Saving Read ..................................................................................................................... 75
16.2 Daylight Saving Write..................................................................................................................... 77
17. Firmware Version ............................................................................................................................. 79
17.1 Firmware Version Read.................................................................................................................. 79
18. Input Name ....................................................................................................................................... 81
18.1 Input Name Read............................................................................................................................ 81
18.2 Input Name Write ........................................................................................................................... 83
18.3 Input Name Reset........................................................................................................................... 85
19. Power Save Mode............................................................................................................................. 87
19.1 Power Save Mode Read ................................................................................................................. 87
19.2 Power Save Mode Write................................................................................................................. 89
19.3 Auto Power Save Time Read ......................................................................................................... 91
19.4 Auto Power Save Time Write......................................................................................................... 92
20. Security Enable ................................................................................................................................ 93
20.1 Security Enable Read..................................................................................................................... 93
20.2 Security Enable Write .................................................................................................................... 94
21. LAN MAC Address ............................................................................................................................ 96

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21.1 LAN MAC Address Read................................................................................................................. 96
22. Emergency Contents........................................................................................................................ 98
22.1 Emergency Contents Display......................................................................................................... 98
22.2 Emergency Contents Delete........................................................................................................ 100

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I. Application
This document defines the communications method for control of the NEC LCD monitor, MultiSync
C431 /C501 /C551 when using an external controller.

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II. Preparation
2. Connectors and wiring
2.1 RS-232C Remote control
Connector: 9-pin D-Sub
Cable: Cross (reversed) cable or null modem cable
(Please refer “Controlling the LCD monitor via RS-232C Remote control”on User’s manual.)
2.2 LAN control
Connector: RJ-45 10/100 BASE-T
Cable: Category 5 or higher LAN cable
(Please refer “Controlling the LCD monitor via LAN control”on User’s manual.)

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III. Communication specification
3. Communication Parameter
3.1 RS-232C Remote control
(1) Communication system Asynchronous
(2) Interface RS-232C
(3) Baud rate 9600bps
(4) Data length 8bits
(5) Parity None
(6) Stop bit 1 bit
(7) Communication code ASCII
3.2 LAN control
(1) Communication system TCP/IP (Internet protocol suite)
(2) Interface Ethernet (CSMA/CD)
(3) Communication layer Transport layer (TCP)
* Using the payload of TCP segment.
(4) IP address (Default) Automatic setup
* If you need to change,
Please refer “Network settings”on User’s manual.
(5) Port No. 7142 (Fixed)
(Note)
The monitor will disconnect the connection if no packet data is received for 15 minutes.
And the controller (PC) has to re-connect to control the monitor again, after 15 minutes or
more.
3.3 Communication timing
The controller should wait for a reply packet before the next command is sent.
(Note)
When the following commands are sent, a controller should wait for specified period after
receiving the reply command before sending the next command.
 Power On, Power Off: 15 seconds
 Input, Auto Setup, Factory Reset: 10 seconds

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4. Communication Format
The command packet consists of four parts, Header, Message, Check code and Delimiter.
Note: Don't add extra data (Example: padding data) after Delimiter.
Recommended sequence of a typical procedure to control a monitor is as follows,
[A controller and a monitor, two-way communication composition figure]
■For the general command (see the part "6.3. Operation Code (OP code) Table”)
■For the special command (see the part 7 to 24. and 5.5.2)
Header Message Check Code Delimiter
MonitorController
Get Parameter
Get Parameter Reply
Set Parameter
Set Parameter
Get Parameter Reply
Save Current Setting Command
Get Parameter
The controller sends command to
get a value from the monitor
that you want to change.
The monitor replies a current
value of the requested item.
The controller sends commands
to set an adjusted value.
The monitor replies to the
controller for confirmation.
The controller sends command to
get a value for confirmation.
The monitor replies an adjusted
value.
The controller requests to
store the adjusted value to the
monitor.
Command
Command Reply
The control does not suitable
for above fixed protocol; use
the proper command for each
control. Please refer section
5.5 and section 7 to 26.
The monitor replies a proper
message defined for each
Save Current Setting Command Reply
The monitor replies to the
controller for confirmation.
MonitorController

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4.1 Header block format (fixed length)
1
st
byte) SOH: Start of Header
ASCII SOH (01h)
2
nd
byte) Reserved: Reserved for future extensions.
On this monitor, it must be ASCII '0'(30h).
3
rd
byte) Destination: Destination equipment ID. (Receiver)
Specify a commands receiver’s address.
The controller sets the “MONITOR ID”or “GROUP ID”of the monitor controlled in here.
On the reply, the monitor sets ‘0’(30h), always.
“MONITOR ID”, “GROUP ID”to “Destination Address”conversion table is as follows,
Monito
r
ID
Destinatio
n
Address
Monito
r
ID
Destinatio
n Address Monito r
ID
Destinatio
n Address Monito r
ID
Destinatio
n Address
1 41h(‘A’) 26 5Ah(‘Z’) 51 73h 76 8Ch
2 42h(‘B’) 27 5Bh 52 74h 77 8Dh
3 43h(‘C’) 28 5Ch 53 75h 78 8Eh
4 44h(‘D’) 29 5Dh 54 76h 79 8Fh
5 45h(‘E’) 30 5Eh 55 77h 80 90h
6 46h(‘F’) 31 5Fh 56 78h 81 91h
7 47h(‘G’) 32 60h 57 79h 82 92h
8 48h(‘H’) 33 61h 58 7Ah 83 93h
9 49h(‘I’) 34 62h 59 7Bh 84 94h
10 4Ah(‘J’) 35 63h 60 7Ch 85 95h
11 4Bh(‘K’) 36 64h 61 7Dh 86 96h
12 4Ch(‘L’) 37 65h 62 7Eh 87 97h
13 4Dh(‘M’) 38 66h 63 7Fh 88 98h
14 4Eh(‘N’) 39 67h 64 80h 89 99h
15 4Fh(‘O’) 40 68h 65 81h 90 9Ah
16 50h(‘P’) 41 69h 66 82h 91 9Bh
17 51h(‘Q’) 42 6Ah 67 83h 92 9Ch
18 52h(‘R’) 43 6Bh 68 84h 93 9Dh
19 53h(‘S’) 44 6Ch 69 85h 94 9Eh
20 54h(‘T’) 45 6Dh 70 86h 95 9Fh
21 55h(‘U’) 46 6Eh 71 87h 96 A0h
22 56h(‘V’) 47 6Fh 72 88h 97 A1h
23 57h(‘W’) 48 70h 73 89h 98 A2h
24 58h(‘X’) 49 71h 74 8Ah 99 A3h
25 59h(‘Y’) 50 72h 75 8Bh 100 A4h
ALL 2Ah(‘*’)
Group
ID Destination
Address Group ID
Destination
Address Group ID Destination Address Group ID
Destination
Address
A 31h(‘1’) D 34h(‘4’) G 37h(‘7’) J 3Ah(‘:’)
B 32h(‘2’) E 35h(‘5’) H 38h(‘8’)
C 33h(‘3’) F 36h(‘6’) I 39h(‘9’)
Header
Message
Check code Delimiter
SOH Reserved
'0' Destination Source Message Type Message Length
1
st
2
nd
3
rd
4
th
5
th
6
th
-7
th

(9/104)
Ex.) If you want to control a monitor that has the "ID No." as '1', specify a destination
address 'A'(41h). If you want to control all of the monitors which are connected by a daisy
chain, specify a destination address ‘*’(2Ah).
4
th
byte) Source: Source equipment ID. (Sender)
Specify a sender address.
The controller must be ‘0’(30h).
On the reply, the monitor sets the own MONITOR ID in here.
5
th
byte) Message Type: (Case sensitive.)
Refer to section 4.2 “Message block format”for more details.
ASCII 'A' (41h): Command.
ASCII 'B' (42h): Command reply.
ASCII 'C' (43h): Get current parameter from a monitor.
ASCII 'D' (44h): "Get parameter" reply.
ASCII 'E' (45h): Set parameter.
ASCII 'F' (46h): "Set parameter" reply.
6
th
-7
th
bytes) Message Length:
Specify the length of the message (that follows the header) from STX to ETX.
This length includes STX and ETX.
The byte data must be encoded to ASCII characters.
Ex.) The byte data 3Ah must be encoded to ASCII characters '3' and 'A' (33h and 41h).
The byte data 0Bh must be encoded to ASCII characters '0' and 'B' (30h and 42h).

(10/104)
4.2 Message block format
“Message block format”is allied to the “Message Type”in the “Header”.
Refer to the section 4.1 “Header block format”for more detail.
1)Get current parameter
The controller sends this message when you want to get the status of the monitor.
For the status that you want to get, specify the “OP code page”and “OP code”,
refer to “Appendix A. Operation code table”.
“Message format”of the “Get current parameter”is as follows,
 Refer to section 5.1 “Get current parameter from a monitor.”for more details.
2)Get Parameter reply
The monitor will reply with the status of the requested item specified by the controller
in the “Get parameter message”.
“Message format”of the “Get parameter reply”is as follows,
 Refer to section 5.2 “Get parameter reply”for more details.
3)Set parameter
The controller sends this message to change a setting of the monitor.
Message format of the “Set parameter”is as follows,
 Refer to section 5.3 “Set parameter”for more details.
4)Set Parameter reply
The monitor replies with this message for a confirmation of the “Set parameter message”.
Message format of the “Set parameter reply”is as follows,
 Refer to section 5.4 “Set parameter reply”for more details.
5)Command
“Command message”format depends on each command.
Usually, this “command message”is used for some non-slider controls and some special operations,
such as “Save current settings”, “Get timing report”, “power control”, “Schedule”, etc. Refer
Header
Message
Check code Delimiter
STX OP code
page OP code
ETX
Hi
Lo
Hi
Lo
STX Result OP code
page OP code
Type Max value Current Value ETX
Hi
Lo
Hi
Lo
Hi
Lo
Hi
Lo
MSB
LSB MSB
LSB
STX
OP code
page OP code
Set Value ETX
Hi
Lo
Hi
Lo
MSB
LSB
STX
Result
OP code
page OP code
Type Max value Requested setting
Value ETX
Hi
Lo
Hi
Lo
Hi
Lo
Hi
Lo
MSB
LSB MSB
LSB

(11/104)
to section 5.5 “Commands message”for more details.
6)Command reply
The monitor replies to a query from the controller.
“Command reply message”format depends on each command.
Refer to section 5.5 “Commands message”for more details.

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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
4.4 Delimiter
Packet delimiter code; ASCII CR(0Dh).
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
Header
Message
Check code
Delimiter

(13/104)
5. Message type
5.1 Get current Parameter from a monitor.
Send this message when you want to get the status of a monitor.
For the status that you want to get, specify the “OP code page”the “OP code”, refer to
“Appendix A. Operation code table”.
1
st
byte) STX: Start of Message
ASCII STX (02h)
2
nd
-3
rd
bytes) OP code page: Operation code page.
Specify the “OP code page”for the control which you want to get the status.
Refer to “Appendix A Operation code table”for each item.
OP code page data must be encoded to ASCII characters.
Ex.) The byte data 02h must be encoded to ASCII characters '0' and '2' (30h and 32h).
OP code page 02h -> OP code page (Hi) = ASCII '0' (30h)
OP code page (Lo) = ASCII '2' (32h)
Refer to Operation code table. (Appendix A)
4
th
–5
th
bytes) OP code: Operation code
Refer to “Appendix A Operation code table”for each item.
OP code data must be encoded to ASCII characters.
Ex.) The byte data 3Ah must be encoded to ASCII characters '3' and 'A' (33h and 41h).
OP code 3Ah -> OP code (Hi) = ASCII '3' (33h)
OP code (Lo) = ASCII 'A' (41h)
Refer to Operation code table.
6
th
byte) ETX: End of Message
ASCII ETX (03h)
STX OP code
page OP code ETX
Hi
Lo
Hi
Lo
1
st
2
nd
-3
rd
4
th
–5
th
6
th

(14/104)
5.2 "Get parameter" reply
The monitor replies with a current value and the status of the requested item (operation code).
1
st
byte) STX: Start of Message
ASCII STX (02h)
2
nd
-3
rd
bytes) Result code.
These bytes indicate a result of the requested commands as follows,
00h: No Error.
01h: Unsupported operation with this monitor or unsupported operation under current
condition.
This result code from the monitor is encoded to ASCII characters.
Ex.) The byte data 01h is encoded to ASCII character '0' and '1' (30h and 31h).
4
th
–5
th
bytes) OP code page: Operation code page.
These bytes indicate a replying item's OP code page.
This returned value from the monitor is encoded to ASCII characters.
Ex.) The byte data 02h is encoded to ASCII character '0' and '2' (30h and 32h).
Refer to the operation code table.
6
th
–7
th
bytes) OP code: Operation code
These bytes indicate a replying item's OP code.
This returned value from the monitor is encoded to ASCII characters.
Refer to the operation code table.
Ex.) The byte data 1Ah is encoded to ASCII character '1' and 'A' (31h and 41h).
8
th
-9
th
bytes) Type: Operation type code
00h: Set parameter
01h: Momentary
Like the Auto Setup function which automatically changes the parameter.
This returned value from the monitor is encoded to ASCII characters.
Ex.) The byte data 01h is encoded to ASCII character '0' and '1' (30h and 31h).
10
th
-13
th
bytes) Max. value: Maximum value which monitor can accept. (16bits)
This returned value from the monitor is encoded to ASCII characters.
Ex.) '0','1','2' and '3' means 0123h (291)
14
th
-17
th
bytes) Current Value: (16bits)
This returned value from the monitor is encoded to ASCII characters.
Ex.) '0','1','2' and '3' means 0123h (291)
STX
Result OP code
page OP code
Type Max value Current Value ETX
Hi
Lo
Hi
Lo
Hi
Lo
Hi
Lo
MSB
LSB
MSB
LSB
1
st
2
nd
-3
rd
4
th
–5
th
6
th
–7
th
8
th
-9
th
10
th
-13
th
14
th
-17
th
18
th

(15/104)
18
th
byte) ETX: End of Message
ASCII ETX (03h)

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5.3 Set parameter
Send this message to change monitor’s adjustment and so on.
The controller requests a monitor to change value.
1
st
byte) STX: Start of Message
ASCII STX (02h)
2
nd
-3
rd
bytes) OP code page: Operation code page
This OP code page data must be encoded to ASCII characters.
Ex.) The byte data 02h must be encoded to ASCII '0' and '2' (30h and 32h).
Refer to the Operation code table.
4
th
-5
th
bytes) OP code: Operation code
This OP code data must be encoded to ASCII characters.
Ex.) OP code 1Ah -> OP code (Hi) = ASCII '1' (31h)
OP code (Lo) = ASCII 'A' (41h)
Refer to the Operation code table.
6
th
-9
th
bytes) Set value: (16bit)
This data must be encoded to ASCII characters.
Ex.) 0123h -> 1
st
(MSB) = ASCII '0' (30h)
2
nd
= ASCII '1' (31h)
3
rd
= ASCII '2' (32h)
4
th
(LSB) = ASCII '3' (33h)
10
th
byte) ETX: End of Message
ASCII ETX (03h)
STX
OP code
page OP code
Set Value ETX
Hi
Lo
Hi
Lo
MSB
LSB
1
st
2
nd
-3
rd
4
th
-5
th
6
th
-9
th
10
th

(17/104)
5.4 "Set parameter" reply
The Monitor echoes back the parameter and status of the requested operation code.
1
st
byte) STX: Start of Message
ASCII STX (02h)
2
nd
-3
rd
bytes) Result code
ASCII '0''0' (30h, 30h): No Error.
ASCII '0''1' (30h, 31h): Unsupported operation with this monitor or unsupported operation
under current condition.
4
th
-5
th
bytes) OP code page: Echoes back the Operation code page for confirmation.
Reply data from the monitor is encoded to ASCII characters.
Ex.) OP code page 02h -> OP code page = ASCII '0' and '2' (30h and 32h)
Refer to Operation code table.
6
th
-7
th
bytes) OP code: Echoes back the Operation code for confirmation.
Reply data from the monitor is encoded to ASCII characters.
Ex.) OP code 1Ah -> OP code (Hi) = ASCII '1' (31h)
OP code (Lo) = ASCII 'A' (41h)
Refer to Operation code table
8
th
-9
th
bytes) Type: Operation type code
ASCII '0''0' (30h, 30h): Set parameter
ASCII '0''1' (30h, 31h): Momentary
Like Auto Setup function, that automatically changes the parameter.
10
th
-13
th
bytes) Max. value: Maximum value that monitor can accept. (16bits)
Reply data from the monitor is encoded to ASCII characters.
Ex.) '0''1''2''3' means 0123h (291)
14
th
-17
th
bytes) Requested setting Value: Echoes back the parameter for confirmation. (16bits)
Reply data from the monitor is encoded to ASCII characters.
Ex.) '0''1''2''3' means 0123h (291)
18
th
byte) ETX: End of Message
ASCII ETX (03h)
STX Result OP code
page OP code Type Max value Requested setting Value ETX
Hi Lo Hi Lo Hi Lo Hi Lo MSB
LSB MSB
LSB
1
st
2
nd
-3
rd
4
th
-5
th
6
th
-7
th
8
th
-9
th
10
th
-13
th
14
th
-17
th
18
th

(18/104)
5.5 Commands
"Command message format" depends on each command. Some commands are shown with usage. Refer to
section 7 to 25.
5.5.1 Save Current Settings.
The controller requests for the monitor to store the adjusted value.
 Send "OC"(30h, 43h) as Save current settings command.
 Complete "Save Current setting" command packet as follows;
ASCII: 01h-30h-41h-30h-41h-30h-34h-02h-30h-43h-03h-CHK-0Dh
SOH-'0'-'A'-'0'-'A'-'0'-'4'-STX-'0'-'C'-ETX-CHK- CR
The monitor replies the packet for confirmation as follows;
SOH-'0'-'0'-'A'-'B'-'0'-'6'-STX-'0'-'0'-'0'-'C'-ETX-CHK- CR
STX
Command code
ETX
'0' 'C'

(19/104)
5.5.2 Get Timing Report and Timing reply.
The controller requests the monitor to report the displayed image timing.
 Send "07"(30h, 37h) as Get Timing Report command.
 Complete "Get Timing Report" command packet as follows;
ASCII: 01h-30h-41h-30h-41h-30h-34h-02h-30h-37h-03h-CHK-0Dh
SOH-'0'-'A'-'0'-'A'-'0'-'4'-STX-'0'-'7'-ETX-CHK- CR
The monitor replies status as the following format;
 SS: Timing status byte
Bit 7 = 1: Sync Frequency is out of range.
Bit 6 = 1: Unstable count
Bit 5-2 Reserved (Don't care)
Bit 1 1:Positive Horizontal sync polarity
0:Negative Horizontal sync polarity.
Bit 0 1:Positive Vertical sync polarity.
0:Negative Vertical sync polarity.
 H Freq: Horizontal Frequency in unit 0.01kHz
 V Freq: Vertical Frequency in unit 0.01Hz
Ex.) When H Freq is '1''2''A''9' (31h, 32h, 41h, 39h), it means 47.77kHz.
STX Command code
ETX
'0' '7'
STX
Command SS H Freq. V Freq. ETX
'4'
'E'
Hi
Lo
MSB
LSB
MSB
LSB

(20/104)
5.5.3 NULL Message
The NULL message returned from the monitor is used in the following cases;
 To tell the controller that the monitor does not have any answer to give to the host (not
ready or not expected)
 Complete "NULL Message" command packet as follows;
01h-30h-30h-41h-42h-30h-34h-02h-42h-45h-03h-CHK-0Dh
SOH-'0'-'0'-'A'-'B'-'0'-'4'-STX-'B'-'E'-ETX-CHK- CR
STX Command code ETX
'B' 'E'