Communication Protocol - Hitachi 51F510 DP43 Service Manual

3.

Communication Protocol

3.1- Terminal Mode (Communication between television and external PC)
When the RS232C mode is set from Off to On by the television OSD menu and
-
the TXD2 and RXD2 serial communication lines are switched to AV control, the
television can communicate with an external PC.
Set Up
Set AV Control
If you want to use the AV control
Function, please set the RS232C.
Move
Terminal Mode Switching
ON
OFF
(1) External PC can turn terminal mode On and Off.
(2) Communication is prohibited when terminal mode is Off.
(3) When terminal mode is on, Front Keys and Remote do not operate. The only button that will
operate is main power.
(4) When TV set is turned Off and On, terminal mode remains in its current state
(5) Factory Setting: Terminal Mode is Off and AV Control Mode is Off.
(6) The television will always respond when an attempt to turn terminal mode on or off is made
with either an ACK or a NAK.
(7) In the following cases, even if the check box of menu is checked, Terminal mode cannot be
turned on.
Adjust mode
While Event Timer and Timer Recording
-
- While Auto CH scan operates
- While Magic Focus operates
- While upgrade operates
(8) Write function in terminal mode will write data to the EEPROM in the same manner as when
-
unit is operated in Normal Mode through the OSD.
(9)
For OSD functionality in terminal mode, see table 5.
Connected RS232C
On/Off
SEL
Table 3.2.1 Terminal Mode Control
Command sent to PTV
Action
Character
Code (Hex)
Action
Character
Code (Hex)
Projection Television
Response from PTV
Request On Accept / Reject
ENQ ACK/NAK
05
Request OFF Accept / Reject
EOT ACK/NAK
04
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DP43