Communication Format - NEC PlasmaSync 42VP4D User Manual

Communication Format

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
10B
01B
00B
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.
8bit 8bit 8bit
:Usually, a form (with no ID)
:Usually, a form (with no ID)
:Set ID
:Video wall ID
8bit 8bit 8bit
4
8bit 8bit