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NEC V系列显示器串口控制协议说明书

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NEC V系列显示器串口控制协议说明书

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External Control NEC LCD Monitor

1. Application

This document defines the communications method for control of the NEC LCD monitor MultiSync V321,V461

and LCD4215

(R)

when using an external controller

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

( Except LCD4215

(R)

)

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.)

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

( Except LCD4215

(R)

)

(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) 192.168.0.10

* If you need to change,

Please refer “Network settings” on User’s manual.

(5) Port No. 7142 (Fixed)

3.3 Communication timing

The controller should wait for a packet interval before next command is sent.

The packet interval needs to be longer than 600msec for the LCD monitor.

(2/37)

4. Communication Format

The command packet consists of four parts, Header, Message, Check code and Delimiter.

Sequence of a typical procedure to control a monitor is as follows,

[A controller and a monitor, two-way communication composition figure]

4.1 Header block format (fixed length)

byte) SOH: Start of Header

ASCII SOH (01h)

Header Message Check Code Delimiter

Header

Message

Check code

Delimiter

SOH

Reserved

'0'

Destination Source

Message

Type

Message

Length

-7

Monitor Controller

Header

Message

Check Code

Delimiter

Header

Message

Check Code

Delimiter

Get Parameter

Get Parameter Reply

Header

Message

Check Code

Delimiter

Set Parameter

Header

Message

Check Code

Delimiter

Set Parameter Reply

Header

Message

Check Code

Delimiter

Header

Message

Check Code

Delimiter

Get Parameter Reply

Save Current Setting Command

Get Parameter

Header

Message

Check Code

Delimiter

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.

Header

Message

Che

ck Code

Delimiter

Header

Message

Check Code

Delimiter

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 13.

The monitor replies a proper

message defined for each control.

Header

Message

Check Code

Delimiter

Save Current Setting Command Reply

The monitor replies to the

controller for confirmation.

(3/37)

byte) Reserved: Reserved for future extensions.

On this monitor, it must be ASCII '0'(30h).

byte) Destination: Destination equipment ID. (Receiver)

Specify a commands receiver’s address.

The controller sets the “MONITOR ID” of the monitor controlled in here.

On the reply, the monitor sets ‘0’ (30h), always.

“MONITOR ID” to “Destination Address” conversion table is as follows,

Monitor

Destination

Address

Monitor

Destination

Address

1 41h(‘A’) 26 5Ah(‘Z’)

2 42h(‘B’)

3 43h(‘C’)

4 44h(‘D’)

5 45h(‘E’)

6 46h(‘F’)

7 47h(‘G’)

8 48h(‘H’)

9 49h(‘I’)

10 4Ah(‘J’)

11 4Bh(‘K’)

12 4Ch(‘L’)

13 4Dh(‘M’)

14 4Eh(‘N’)

15 4Fh(‘O’)

16 50h(‘P’)

17 51h(‘Q’)

18 52h(‘R’)

19 53h(‘S’)

20 54h(‘T’)

21 55h(‘U’)

22 56h(‘V’)

23 57h(‘W’)

24 58h(‘X’)

25 59h(‘Y’)

ALL 2Ah(‘*’)

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).

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.

byte) Message Type: (Case sensitive.)

Refer to section 4.2 “Message block format” for more details.

ASCII 'A' (41h): Command.

(4/37)

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.

-7

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).

4.2 Message block format

“Message block format” is allied to the “Message Type” in the “Header”.

Refer to the section 6 “Message format” for more detail.

）

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.

）

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.

）

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.

Header

Message

Check code

Delimiter

OP code page

OP code

STX

Hi Lo Hi Lo

ETX

Result

OP code

page

OP code Type Max value Current Value

STX

Lo Hi

MSB

LSB MSB

LSB

ETX

OP code

page

OP code Set Value

STX

MSB

LSB

ETX

(5/37)

）

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.

）

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 to

section 5.5 “Commands message” for more details.

）

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.

4.5 Check code

Check code is the Block Check Code (BCC) between the Header and the End of Message except SOH.

n+1

= D

XOR D

XOR ,,, D

XOR: Exclusive OR

Following is an example of a Check code (BCC) calculation.

Result

OP code

page

OP code

Type Max value

Requested setting

Value

ETX

STX

Hi Lo

MSB

LSB MSB LSB

Header

Message

Check code

Delimiter

SOH D

Reserved D

Destination D

Source D

Type D

Length(H) D

Length(L) D

STX D

Data D

| |

ETX D

Check code D

n+1

P P P P P P P P

Header Message

SOH

Reserved

Destination

Address

Source

Address

Message

type

Message length STX

OP code

page

OP code Set Value ETX

Check

code

(BCC)

Delimiter

30 41 30 45 30 41 02 30

03 77 0D

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