NEC 42VP4D User Manual - Page 57

Communication Format, Command1, Unit ID1,2 UA1,UA2

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Communication Format Command 1 Unit ID 1 Unit ID 2 Command 2 Data length Data Check sum 8bit 8bit 8bit 8bit 8bit 8bit 8bit 8bit Command1 Command 1, along with command 2, is a number used to distinguish each command. When making it operate using ID, bit1 and bit0 are set up as follows. Bit1,Bit0 Unit ID distinction bit 11B :Usually, a form (with no ID) 10B :Usually, a form (with no ID) 01B :Set ID 00B :Video wall ID In the case of ACK, when the lower order 4 bits is FH (as in 3FH and 7FH), this indicates that the commands and data of the supported equipment have been received. When the lower order 4 bits is BH (as in 3BH and 7BH), this indicates that unsupported commands and data have been received. Unit ID1,2 (UA1,UA2) Unit ID 1 and unit ID 2 are numbers used to identify the equipment that is to be connected. 60H is used for the plasma monitor and 80H is used for external control equipment such as a personal computer. 4

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Communication Format
8bit
8bit
8bit
8bit
8bit
8bit
8bit
8bit
Command 1
Unit ID 1
Unit ID 2
Command 2
Data length
Data
Check sum
Command1
Command 1, along with command 2, is a number used to distinguish each
command.
When making it operate using ID, bit1 and bit0 are set up as follows.
Bit1,Bit0 Unit ID distinction bit
11B
:Usually, a form (with no ID)
10B
:Usually, a form (with no ID)
01B
:Set ID
00B
:Video wall ID
In the case of ACK, when the lower order 4 bits is FH (as in 3FH and
7FH), this indicates that the commands and data of the supported
equipment have been received. When the lower order 4 bits is BH (as in
3BH and 7BH), this indicates that unsupported commands and data
have been received.
Unit ID1,2 (UA1,UA2)
Unit ID 1 and unit ID 2 are numbers used to identify the equipment
that is to be connected.
60H is used for the plasma monitor and 80H is used for external control
equipment such as a personal computer.
4