Hitachi 32HDL51M, Service Manual

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13
PLC1/AVC5-UB
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.
Table 3.2.1 Terminal Mode Control
(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.
Set Up
Set AV Control
If you want to use the AV control
Function, please set the RS232C.
Connected RS232C
Move
SEL
Projection Television Terminal Mode Switching
Command sent to PTV Response from PTV
Action Request On Accept / Reject
Character ENQ ACK/NAK ON
Code (Hex) 05 06/15
Action Request OFF Accept / Reject
Character EOT ACK/NAK OFF
Code (Hex) 04 06/15
On/Off