3
Data communication between the remote control
device and the monitor is performed in accordance
with the following format.
• STX: start of text code value equals 02hex.
• Byte Count
This indicates the number of data bytes (maximum
255 bytes) which have been inserted between this
byte and the Checksum byte.
Values 00hex, 01hex, 02hex are illegal values.
• Destination address:
One byte address value which defines who the
message is for. Value 01hex should be specified.
• Source address:
One byte address value which defines where the
message came from. This is who to reply to with
the message. Value from 41hex to 7Fhex should be
specified.
Command Block Format
STX Byte Count Source Address Command Block Checksum
1 byten bytes1 byte1 byte1 byte1 byte
Destination
Address
• Command Block
This j}signates a particular command. Refer to
“Command Description” 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.
Communication
The remote control device should take the initiative in
communication between the remote controller and the
monitors.
The monitor will carry out one of the following three
actions when it receives the message.
• When the received message is an undefined
message or a communication error occurs then
issue: NAK (05hex)
• When the received command is a question then
issue: Specific Reply + Data
• When the received command is anything else issue:
ACK
The remote control should not issue any other
commands until the response has been received from
the monitor.
The remote control should not leave a gap between
bytes to be transmitted of more than ten milliseconds.
Otherwise the monitor will treat the message as
received in ERROR.
If the remote control unit receives NAK from the
monitor it must wait more than ten milliseconds
before transmitting any more messages.
Communication Protocol
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