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

(1/56)
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

(2/56)
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

(3/56)
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.)

(4/56)
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

(5/56)
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)

(6/56)
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

(7/56)
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)

(8/56)
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.

(9/56)
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

(10/56)
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