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Command Block Format
Data communication between the remote controller and
the monitor is performed in accordance with the
following format.
STX
Byte
Destination
Count
Address
1 byte 1 byte 1 byte
• STX: start of text code value equals 02H.
• Byte Count
This indicates the number of data bytes (maximum
255 bytes) which have been inserted between this byte
and the Checksum byte. Values 00H, 01H, 02H are
illegal values.
• Destination address:
One byte address value which defines who receives
the message. The value 01H should be specified.
• Source address:
One byte address value which defines who transmits
the message. The destination to which the reply
should be sent is shown with this value. A value from
41H to 7FH should be specified.
• Command Block
This designates a particular command. Refer to
"Command Description" (on page 7) for the details.
• Checksum
This value is set so that the bottom eight bits of the
sum of all bytes from the byte count to the checksum
inclusive are zero.
4
Command Block Format / Communication Protocol
Source
Command
Checksum
Address
Block
1 byte
n bytes
1 byte
Communication
Protocol
The remote controller should take the initiative in
communication between the remote controller and the
monitors.
The monitor will carry out one of the following actions
when receiving the message.
• When the received message is an undefined message,
a communication error occurs or the automatic
adjustment of APA or AUTO CHROMA/PHASE is
working, a NAK (05H) is issued.
• When the received command is a question, the specific
replay and data are issued.
• When the received command is anything else, an ACK
is issued.
The next message can be received as soon as a NAK is
issued from the monitor to the remote controller.
Notes
• If there are not enough or too many data bytes of data
values then a NAK is issued and no values are
specified.
• Bits which are not specified here are undefined bits
and their values are always ignored.
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