TX-P55VT60Y, TX-PR55VT60 - Panasonic Plasma Service Manual (repair manual). Page 10

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The Service port (M3 mini Jack) on the following TVs can use as the RS232C terminal which is a standard computer SERIAL 
interface.
 *This operation system should be used by the certified professional dealer.

• The TV can be controlled by a personal computer when connected through an RS232C/ M3 mini jack conversion cable (not 

supplied).

• The computer will require software which allows sending and receiving of control data through its SERIAL port.

Please see required parameters and commands below.

The transmission of control data from the PC starts with a STX signal, followed by the command, the parameters, and lastly an 
EXT signal in that order. If there are no parameters, then the parameter signal does not need to be sent.
*Please see other side regarding Commands and Parameters.

• With standby mode, this TV responds to "PON" and "QPW" commands only.
• Wait for the response of the first command to come from this unit before sending the next command.
• If multiple commands are transmitted, be sure to keep intervals of 250 m sec.

Send the command again when the call back command is unusual.

• If an incorrect command is sent by mistake, this TV will send an "ER401" or "ER402" command back to the computer.
• This TV does not respond for 15 seconds when "PON" or "POF" commands are transmitted.
• Send "EXT" commands before sending "IMS:**" commands.
• MUTE commands ("AMT: 0" and "AMT: 1") and "AVL: ***" command are invalid in case of HDMI (CEC) cooperation.

However AMT, AUU, AUD commands is effective. (MUTE rotation (toggle), VOLUME UP and VOLUME DOWN controls are 
possible.)

Signal level 

RS-232C compliant

Synchronization method 

Asynchronous

Baud rate 

9600 bps

Parity None

Character length 

8 bits

Stop bit 

1 bit

Flow control 

-