NEC VT695 NP115 : RS232 codes- Projectors - Page 5

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1 2 To TxD of PC 3 To RxD of PC 4 5 To GND of PC 6 7 To CTS of PC 8 To RTS of PC 9 4. Communication Frame On the LT/MT/SX/GT series projectors communication is done in a frame composed of header, data, and checksum. The frame sent from the controller to the projector is referred to as a command, and the one sent from the projector to the command as an reply is referred to as a response. The response has two types; Acknowledge (hereafter referred to as ACK) that recognizes a command and Negative Acknowledge (hereafter referred to as NAK) that fails to recognize a command. Command | | | Controller | | Projector | | | Response (ACK or NAK) 4-1. Frame Format One frame comprises a header, a data portion, and a checksum. Frame Format: | Header portion | Data portion |Checksum| | | (Max. 4095 Bytes) | | |1|2|3| 4 |5|6| ~ | n | m | | 8 | 8 | 8 | 4 | 12 | 8 | ~ | 8 | 8 | | Bit | Bit | Bit |Bit| Bit | Bit | ~ | Bit | Bit | | | || | Data length Model code Projector ID ID2 ID1 * ID1: (8 Bit) This is an identification data assigned to each command. Command : This sets an identification data assigned to each command to send it. ( See each command description.)

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1
2
To TxD of PC
3
To RxD of PC
4
5
To GND of PC
6
7
To CTS of PC
8
To RTS of PC
9
====================================================================
4. Communication Frame
----------------------------------------------------------------------
On the LT/MT/SX/GT series projectors communication is done in a frame
composed of header, data, and checksum.
The frame sent from the controller to the projector is referred to as
a command, and the one sent from the projector to the command as an
reply is referred to as a response.
The response has two types; Acknowledge (hereafter referred to as ACK)
that recognizes a command and Negative Acknowledge (hereafter referred
to as NAK) that fails to recognize a command.
+--------------+
Command
+--------------+
|
|-------------->|
|
| Controller
|
|
Projector
|
|
|<--------------|
|
+--------------+
Response
+--------------+
(ACK or NAK)
4-1. Frame Format
**********************************************************************
One frame comprises a header, a data portion, and a checksum.
Frame Format:
+-------------------------------+----------------------+--------+
|
Header portion
|
Data portion
|Checksum|
|
|
(Max. 4095 Bytes)
|
|
+-----+-----+-----+-------+-----+-----+--
--+-------+--------+
|
1
|
2
|
3
|
4
|
5
|
6
|
~
|
n
|
m
|
+-----+-----+-----+---+---+-----+-----+--
--+-------+--------+
|
8
|
8
|
8
| 4 |
12
|
8
|
~
|
8
|
8
|
| Bit | Bit | Bit |Bit|
Bit
| Bit |
~
|
Bit
|
Bit
|
+-----+-----+-----+---+---------+-----+--
~ --+-------+--------+
|
|
|
|
|
|
|
|
|
+------------- Data length
|
|
|
+-------------------- Model code
|
|
+------------------------- Projector ID
|
+------------------------------- ID2
+------------------------------------- ID1
* ID1: (8 Bit)
This is an identification data assigned to each command.
Command :
This sets an identification data assigned to each command to send it.
( See each command description.)