Mitsubishi Electric RS232/485/LAN Serial Communication Control User manual

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RS232/485/LAN Serial Communication Control
for MDT652S
1. Application
This document defines the communication protocols for serial control of the MDT652S.
-----Revision History-----
1
st
Release May. 24 2011. H.Tanizoe, M.Juichiya, T.Kimura, Y.Ashizaki

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2. Connectors and wiring
A: RS232C connection
Connector: D-Sub 9-pin
Cable: Cross (reversed) cable or null modem cable
B: CAT5 RS485 connection
Connector: D-SUB 9pin or USB(Either one can be used for communication between PC and CAT5
Tx-BOX and Rx-BOX (Option). In order to use the USB, you need USB driver with your PC
installed. Please check User's manual for details.)
Cable: (D-SUB 9pin: Full wired Cross (reversed) cable, USB: Standard USB cable (A-B))
Note: The CAT5 serial communication function requires half duplex communication control by DTR and
RTS control which is not required by simple RS232C control. The RS485 communication function is
different fromRS232C control method. Please check Appendix B for more details.
C: LAN connection
Connector: Modular 8pin (RJ45)
Cable:
Modular 8pin (RJ45), Strait CAT5/6/7 LAN cable
* If you connect one PC and one display without LAN HUB, you use Cross LAN cable.
PC LAN HUB Display #1 Display #2
LAN cable LAN cables
Note: LAN control is converted to RS-232C control in the display.
USB Cable

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3. Communication Parameter
Set each communication parameters to the PC connected with each kind of cable.
A: RS-232C connection
(1) RS-232C direct connection between PC and Display
Interface RS-232C (
Asynchronous, Full-duplex)
Baud rate 9600bps
Data length 8bits
Parity None
Stop bit 1 bit
Flow control None
Communication code ASCII
Communication signals TXD, RXD
B: CAT5 (OPTION) RS-485 connection
(1) USB connection between PC and CAT5 Tx BOX
Interface RS-232C (
Asynchronous, Half-duplex) via USB driver
Baud rate 9600bps
Data length 8bits
Parity None
Stop bit 1 bit
Flow control None
Communication code ASCII
Communication signals TXD, RXD, RTS
Note: Set the parameters on to USB driver properties. RTS is negative polarity.
(2)
RS-232C connection between PC and CAT5 Tx BOX
Interface RS-232C (
Asynchronous, Half-duplex)
Baud rate 9600bps
Data length 8bits
Parity None
Stop bit 1 bit
Flow control None
Communication code ASCII
Communication signals TXD, RXD, DTR
Note: DTR is negative polarity.
C: LAN connection
(1) LAN connection between PC and Display
Interface TCP/IP
DHCP client mode Changeable (default = OFF: not using)
IP address Changeable (default = 192.168.0.10: depends on model)
Subnet mask Changeable (default = 255.255.255.0)
Default gateway Changeable (default = 192.168.0.1: depends on model)
Port MDT652S:63007/3007(Both of those ports are available. Use
63007 only if you have no support of legacy products.)

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3.1 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 MDT652S.
[Important Information]
HOST system shall send next command after receiving a reply command from Monitor, if it is sequential
commands communication. If Host doesn’t wait for monitor’s reply, monitor operation error may happen.
Time-out error handling operation in Controller: Host Controller shall wait the reply from Monitor, after sending command as
mentioned above. The time-out setting in Host Controller shall be more than 30sec after sending command to Monitor. (Using the
maximum command interval “a
MAX
” is most safety.)
Communication disabled period after power on/off: After Monitor Power on, either by AC switch, Remote Controller or
Serial communication command, Monitor goes initialize mode of controller and can not handle the remote control
commands correctly during the mode. So do NOT send any command at least 7 sec. after monitor power on/off. If you make
the code which send any command after POWER ON/OFF command, please put a wait at least 7 sec. after sending the
command.
About the other commands, please wait the each periods of command interval from PC. (See below example.)
[Available Command list at DC power off status]
MDT652S can’t accept and reply any command except for the following commands when it is in DC power off or power
saving.
Power status Read / Read Model name Read / Serial number Read /Power on / Power off
Example of communication timing
a
1
b
1
Command #1
Reply #1
Command #2
Reply #2
* Command interval from PC (Wait sending next command for processing in display.)
a > 7sec: When Command #1 is power command “POWER ON”,”POWER OFF”.
a > 5sec: When Command #1 is video input command “INPUT D-SUB”,”INPUT VIDEO”, etc.
a > 1.8sec: When Command #1 is store the adjusted value command “SAVE CURRENT SETTINGS”,
“SAVE CURRENT SETTINGS QUICK”.
a > 6sec: When Command #1 is “AUTO SETUP”.
a > 30sec: When Command #1 is “FACTORY RESET”, “SCREEN RESET”. (This results in a
MAX
)
a > 600msec: When Command #1 is the others.
* Minimum reply time from display (Additional time depends on command processing in display)
b = 10msec (Typ.): On RS-232C connection (The time depends on models as 10 to 20msec.)
b = 140msec (Typ.): On RS-485 connection (The time depends on models as 90 to 140msec.)
b = 30sec (max): When Command #1 is “FACTORY RESET”, “SCREEN RESET”.
* Command internal gap (Don’t make a longer interval gap between characters.)
C < 10msec: Normal communication for time-out error of each character gap.
(Infinit
y
waitin
g
isn’t su
pp
orted because of
p
r
ocessin
g
freeze.)
PC
Display
b
2
a
2
Characters of Command #1
c
1
0
0
v
P
CR

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4. Communication Format
4-1.Basic command
This command set supports only the basic control of monitor and does NOT support multi monitor control
by daisy chained connection. This command set will be written in the user’s manual of MDT652S.
1) Control command diagram
The command is structured by the address code, function code, data code and end code. The length of the command is different for
each function.
2) Control sequence
(1) The command from a computer to the LCD monitor will be sent in 600ms.
(2) The LCD monitor will send a return command 600ms* after it has received and encoded. If the command isn’t
received correctly, the LCD monitor will not send the return command.
(3) The personal computer checks the command and confirms if the command, which has been sent, has been executed or not.
(4) This LCD monitor sends various codes other than return code. When having a control sequence by RS-232C, reject other
codes from personal computers side.
*: The sending time of return command may delay depending on the condition (during changing of the input signal, etc.).
Example: Turn the power ON ( ’ ’ is for ASCII code)
Note: The replied status is for communication confirmation. When you want to know the display condition, please use the ‘Read
command’. (See page 6)

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3) Operation commands
The operation commands execute the basic operation setting of this LCD monitor.
It may not operate when changing the signal:
Operation ASCII HEX
POWER ON ! 21h
POWER OFF " 22h
INPUT HDMI _r1 5Fh 72h 31h
INPUT DVI-D _r2 5Fh 72h 32h
INPUT D-SUB _r3 5Fh 72h 33h
INPUT BNC _r4 5Fh 72h 34h
INPUT CAT5 _r5 5Fh 72h 35h
INPUT DisplayPort _r6 5Fh 72h 36h
INPUT VIDEO _v1 5Fh 76h 31h
INPUT YPbPr _v2 5Fh 76h 32h
INPUT S-VIDEO* _v3 5Fh 76h 33h
* S-VIDEO is SEPARATE only
4) Read command
Host computer sends the command without Data-code to monitor.
After receiving this command, the monitor returns the command with Data-code of current status to host computer.
< ex. > When Host computer ask Power status of monitor, the status of monitor is powered-on.
Structure of the Read-command
ASCII HEX
Function Data (Receive) Function Data (Receive)
ON vP 1 76 50 31
POWER
OFF(sleep/stand by) vP 0 76 50 30
HDMI vI r1 76 49 72 31
DVI-D vI r2 76 49 72 32
D-SUB vI r3 76 49 72 33
BNC vI r4 76 49 72 34
CAT5 vI r5 76 49 72 35
DisplayPort vI r6 76 49 72 36
Video vI v1 76 49 76 31
YP ｂ Pr vI v2 76 49 76 32
Input
S-VIDEO vI v3 76 49 76 33
HIGHBRIGHT vM p1 76 4D 70 31 Picture mode
STANDARD vM p2 76 4D 70 32
Around
Main
board
resolution
1˚C
tc1 (ex.) [phone]B 20 32 35 Temperature
of Internal
monitor
Around
Power
PCB
resolution
1˚C
tc2 (ex.) [phone]B 20 33 31

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5) Remote command
(Not executable in sleep/stand-by mode. When the remote commands are sent while sleep/stand-by mode, the stand-by mode is
only canceled.)
Some remote control operations can be achieved by the remote command codes. The remote commands have no data codes.
Function
Button’s name on remote
Character ASCII
+/VOLUME r06 72h 30h 36h
-/VOLUME r07 72h 30h 37h
AV MUTE ra6 72h 61h 36h
AUTO SETUP r09
72h 30h 39h
[Example] When executing the AUTOSETUP. (Figures and symbols enclosed in quotation marks are ASCII codes.):
Sending commands
from the PC, etc.
Status code
from the projector
Description
‘30’ ‘30’ ‘72’ ‘30’ ‘39’ ‘0D’
00r09
Command operating the same
as the MENU button
‘30’ ‘30’ ‘72’ ‘30’ ‘39’ ‘0D’
00r09
Command receipt confirmation
(Command echo back)

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4-2.Extended command
Note: This command set supports multi monitor control by daisy chained connection. This command
set will NOT be written in the user’s manual of MDT652S.
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]
Header Message Check Code Delimiter
MonitorController
H
eader
Messa
g
e
Check CodeDelimiter
H
eader Message Check Code
D
elimiter
Get Parameter
Get Parameter Reply
H
eader
Messa
g
e
Check CodeDelimiter
Set Parameter
H
eader Message Check Code
D
elimiter
Set Parameter Reply
H
eader
Messa
g
e
Check CodeDelimiter
H
eader Message Check Code
D
elimiter
Get Parameter Reply
Save Current Setting Comman
d
Get Parameter
H
eader
Messa
g
e
Check CodeDelimiter
The controller sends a command to
get a value from the monitor that
you want to change.
The monitor replies with the
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 a command to
get a value for confirmation.
The monitor replies with an
adjusted value.
The controller requests to store
the adjusted value to the monitor.

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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.
MDT652S must be ASCII '0'(30h)
3
rd
byte) Destination: Destination equipment ID. (Receiver)
Specify a command’s receiver’s address.
If the command should be sent to certain monitor only, the either of character ‘A’(41h) to ‘Z’(5Ah)
which is corresponding to monitor ID from No1 to No.26 should be set to this portion. If it
is a broad cast command(only “set command” is available), then the ’*’(2Ah)should be applied.
4
th
byte) Source: Source equipment ID. (Sender)
Specify a sender address.
The controller must be ‘0’(30h).
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).
Header Message Check code Delimiter
SOH Reserved
'0' Destination 'A' Source Message Type Message Length
1
st
2
nd
3
rd
4
th
5
th
6
th
-7
th

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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.
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;
Result OP code page OP code Type Max value Requested setting
Value ETX
STX Hi Lo Hi Lo Hi Lo Hi Lo MSB LSB MSB LSB
 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 to
section 5.5 “Commands message” 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 Hi Lo Hi Lo Hi Lo Hi Lo MSB LSB MSB LSB ETX
OP code page OP code Set Value
STX Hi Lo Hi Lo MSB LSB ETX

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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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4.5 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
4.6 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 D
5
STX D
6
Data D
7
| |
| |
ETX D
n
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
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

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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)
5.2 "Get parameter" reply
MDT652S 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,
OP code page OP code
STX Hi Lo Hi Lo ETX
1
st
2
nd
-3
rd
4
th
–5
th
6
th
Result OP code page OP code Type Max value Current Value
STX Hi Lo Hi Lo Hi Lo Hi Lo MSB LSB MSB LSB ETX
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

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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 codes 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
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).
00h: Set parameter
01h: Momentary
Like the AutoSetup function which automatically changes the parameter.
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)
18
th
byte) ETX: End of Message
ASCII ETX (03h)
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
OP code page OP code Set Value
STX Hi Lo Hi Lo MSB LSB ETX
1
st
2
nd
-3
rd
4
th
-5
th
6
th
-9
th
10
th

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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.
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)
5.4 "Set parameter" reply
The Monitor echoes back the parameter and status of the requested operation code.
(If command is sent as “Broadcast” then no reply should be sent back.)
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
Result OP code page OP code Type Max value Requested setting
Value
STX Hi Lo Hi Lo Hi Lo Hi Lo MSB LSB MSB LSB ETX
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

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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)
5.5 Commands
"Command message format" depends on each command . Some commands are shown with usage. Refer to
section 7 to 10.
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;
(The destination “A” (monitor ID of 1) is only an example. It should be changed according
to the target monitor ID)
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
5.5.1a Save Current Settings Quick.
The controller requests for the monitor to store the adjusted value.
This command supports only following items, in order to shorten execute time in monitor inside.
CONTRAST, BRIGHT, Color Temperature, IR Control, Inoformation OSD, H-Position, V-Position, Sharpness,
Black Level, Tint, Color, OSD Turn Off, Off Timer, OSD H-Position, OSD V-Position, Power On Delay,
Gamma Selection, Tiling, Monitor ID, Clock, Clock Phase, Zoom, H-Resolution, V-Resolution.
Command code
STX '0' 'C' ETX
Command code
STX '0' 'D' ETX

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 Send "OD"(30h, 44h) as Save current settings quick command.
 Complete "Save Current setting" command packet as follows;
ASCII: 01h-30h-41h-30h-41h-30h-34h-02h-30h-44h-03h-CHK-0Dh
SOH-'0'-'A'-'0'-'A'-'0'-'4'-STX-'0'-'D'-ETX-CHK- CR
The monitor replies the packet for confirmation as follows;
SOH-'0'-'0'-'A'-'B'-'0'-'6'-STX-'0'-'0'-'0'-'D'-ETX-CHK- CR
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;
(The destination “A” (monitor ID of 1) is only an example. It should be changed according
to the target monitor ID)
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.
5.5.3 NULL Message
The NULL message returned from the monitor is used in the following cases;
 A timeout error has occurred. (The default timeout is 10msec for command internal gap.)
 The monitor receives an unsupported message type.
 The monitor detects a packet BCC (Block Check Code) error.
Command code
STX '0' '7' ETX
Command SS H Freq. V Freq.
STX '4' 'E' Hi Lo MSB LSB MSB LSB ETX
Command code
STX 'B' 'E' ETX

(18/56)
 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;
(The destination “A” (monitor ID of 1) is only an example. It should be changed according
to the target monitor ID)
01h-30h-30h-41h-41h-30h-34h—02h-42h-45h-03h-CHK-0Dh
SOH-'0'-'0'-'A'-'A'-'0'-'4'-STX-'B'-'E'-ETX-CHK- CR
6. Typical procedure example
The following is a sample of procedures to control the monitor, these are examples of "Get parameter",
"Set parameter" and "Save current settings".
6.1. How to change the “Brightness” setting.
Step 1. The controller requests the Monitor to reply with the current brightness setting and capability
to support this operation. (Get parameter)
Header Message Check code Delimiter
SOH-'0'-'A'-'0'-'C'-'0'-'6' STX-'0'-'0'-'1'-'0'-ETX BCC CR
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'A' (41h): Monitor ID
If the command should be sent to certain monitor only, the either of character ‘A’(41h) to ‘Z’(5Ah)
which is corresponding to monitor ID from No1 to No.26 should be set to this portion. If it is
a broad cast command(only “set command” is available), then the ’*’(2Ah)should be applied.
'0' (30h): Message sender is the controller
'C' (43h): Message is "Get parameter command"
'0'-'6' (30h, 36h): Message length is 6 bytes
Message
STX (02h): Start of Message
'0'-'0' (30h, 30h): Operation code page number is 0
'1'-'0' (31h, 30h): Operation code is 10h (in the OP code page 0)
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 “Check code” for a BCC calculation.
Delimiter
CR (0Dh): End of packet
Step 2. The monitor replies with current Brightness setting and capability to support this operation.
(If command is sent as “Broadcast” then no reply should be sent back.)
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'0' (30h): Message receiver is the controller
'A' (41h): Monitor ID
This portion should depend on the monitor ID of Monitor.( ’A’(41h)-‘Z’(5Ah))
'D' (44h): Message Type is "Get parameter reply"
'1'-'2' (31h, 32h): Message length is 18 bytes
Header Message Check code Delimiter
SOH-'0'-'0'-'A'-'D'-'1'-'2' STX-'0'-'0'-'0'-'0'-'1'-'0'-'0'-'0'
-'0'-'0'-'6'-'4'-'0'-'0'-'3'-'2'-ETX BCC CR

(19/56)
Message
STX (02h): Start of Message
'0'-'0' (30h, 30h): Result code. No error
'0'-'0' (30h, 30h): Operation code page number is 0
'1'-'0' (31h, 30h): Operation code is 10h (in the page 0)
'0'-'0' (30h, 30h): This operation is "Set parameter" type
'0'-'0'-'6'-'4' (30h, 30h, 36h, 34h): Brightness max value is 100(0064h)
'0'-'0'-'3'-'2' (30h, 30h, 33h, 32h): Current Brightness setting is 50(0032h) as 50%
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 “Check code” for a BCC calculation.
Delimiter
CR (0Dh): End of packet
Step 3. The controller request the monitor to change the Brightness setting
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'A' (41h): Monitor ID
If the command should be sent to certain monitor only, the either of character ‘A’(41h) to ‘Z’(5Ah)
which is corresponding to monitor ID from No1 to No.26 should be set to this portion. If it is
a broad cast command(only “set command” is available), then the ’*’(2Ah)should be applied.
'0' (30h): Message sender is the controller
'E' (45h): Message Type is "Set parameter command"
'0'-'A' (30h, 41h): Message length is 10 bytes
Message
STX (02h): Start of Message
'0'-'0' (30h, 30h): Operation code page number is 0
'1'-'0' (31h, 30h): Operation code is 10h (in the page 0)
'0'-'0'-'5'-'0' (30h, 30h, 35h, 30h): Set Brightness setting 80(0050h) as 80%
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 “Check code” for a BCC calculation.
Delimiter
CR (0Dh): End of packet
Step 4. The monitor replies with a message for confirmation.
(If command is sent as “Broadcast” then no reply should be sent back.)
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'0' (30h): Message receiver is the controller
'A' (41h): Monitor ID
This portion should depend on the monitor ID of Monitor.( ’A’(41h)-‘Z’(5Ah))
'F' (46h): Message Type is "Set parameter reply"
'1'-'2' (31h, 32h): Message length is 18 bytes
Header Message Check code Delimiter
SOH-'0'-'A'-'0'-'E'-'0'-'A' STX-'0'-'0'-'1'-'0'-'0'-'0'-'5'-'0'-ETX BCC CR
Header Message Check code Delimiter
SOH-'0'-'0'- 'A' -'F'-'1'-'2' STX-'0'-'0'-'0'-'0'-'1'-'0'—'0'-'0'-'0'
-'0'-'6'-'4'-'0'-'0'-'5'-'0'-ETX BCC CR

(20/56)
Message
STX (02h): Start of Message
'0'-'0' (30h, 30h): Result code. No error
'0'-'0' (30h, 30h): Operation code page number is 0
'1'-'0' (31h, 30h): Operation code is 10h (in the page 0)
'0'-'0' (30h, 30h): This operation is "Set parameter" type
'0'-'0'-'6'-'4' (30h, 30h, 36h, 34h): Brightness max value is 100(0064h)
'0'-'0'-'5'-'0' (30h, 30h, 35h, 30h): Received a Brightness setting was 80(0050h) as 80%
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 “Check code” for a BCC calculation.
Delimiter
CR (0Dh): End of packet
 Repeat Step 1 and Step 2, if you need to check the Brightness setting. (Recommended)
Step 5. Request the monitor to store the Brightness setting. (Save Current Settings Command)
Header Message Check code Delimiter
SOH-'0'-'A'-'0'-'A'-'0'-'4' STX-'0-'C'-ETX BCC CR
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'A' (41h): Monitor ID
If the command should be sent to certain monitor only, the either of character ‘A’(41h) to ‘Z’(5Ah)
which is corresponding to monitor ID from No1 to No.26 should be set to this portion. If it is
a broad cast command(only “set command” is available), then the ’*’(2Ah)should be applied.
'0' (30h): Message sender is the controller
'A' (41h): Message type is "Command"
'0'-'4' (30h, 34h): Message length is 4 bytes
Message
STX (02h): Start of Message
'0'-'C' (30h, 43h): Command code is 0Ch as "Save current settings"
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 “Check code” for a BCC calculation.
Delimiter
CR (0Dh): End of packet
6.2 How to read the measurement value of the built-in temperature sensors.
MDT652S has two built-in temperature sensors.
The controller can monitor inside temperatures by using those sensors through RS-232C.
The following shows the procedure for reading the temperatures from the sensors.
Step 1. Select a temperature sensor which you want to read.
Header
SOH (01h): Start of Header
'0' (30h): Reserved
'A' (41h): Monitor ID
If the command should be sent to certain monitor only, the either of character ‘A’(41h) to ‘Z’(5Ah)
which is corresponding to monitor ID from No1 to No.26 should be set to this portion.
'0' (30h): Message sender is the controller
Header Message Check code Delimiter
SOH-'0'-'A'-'0'-'E'-'0'-'A' STX-'0'-'2'-'7'-'8'-'0'-'0'-'0'-'1'-ETX BCC CR