NEC
Solutions
(America),
Inc.
Visual Systems
84VP5/84VM5 Installation Guide
(using four 42VM5 or 42VP5 Plasma Displays)
(also a reference for optional Quad Mount used with 42VM5 or 42VP5)
v1.3
www.necvisualsystems.com
Page 7 of 14
Communication Format
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.
Unit ID 1: Indicates the equipment sending the signal. When supporting Set ID
by the command 1, 4 bits of low ranks of Set ID are set up.
Unit ID 2: Indicates the equipment receiving the signal. When supporting Set ID by the command 1, 4 bits of higher ranks of
Set ID are set up.
* Set ID : it is the apparatus number assigned to each plasma monitor.
Command 2
Command 2, along with command 1, is a number used to distinguish each command.
Check Sum (CKS), Error Processing, and ACK
The check sum described below and RS-232C odd parity are used together for a check of the received data. The check sum
is the lower order 8 bits of one frame of sent or received data comprising the sum total of Command 1, Unit ID 1 and 2,
Command 2, Data Length, and Data.
Command 1
Unit ID 1
Unit ID 2
Command 2
Data length
Data
Check sum
8bit
8bit
8bit
8bit
8bit
8bit
8bit
8bit
