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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 |
|
|<--------------|
+--------------+
Response +--------------+
(ACK or NAK)
4-1. Frame Format
**********************************************************************
One frame comprises a header, a data portion, and a checksum.
Frame Format:
+-------------------------------+----------------------+--------+
|
Header portion
|
| (Max. 4095 Bytes) |
+-----+-----+-----+-------+-----+-----+--
| 1 | 2 | 3 | 4 | 5 | 6 |
+-----+-----+-----+---+---+-----+-----+--
| 8 | 8 | 8 | 4 |
12 | 8 |
| 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.)
+--------------+
|
| Projector |
|
|
Data portion
|Checksum|
--+-------+--------+
~ | n |
m |
--+-------+--------+
~ | 8 |
8 |
~ | Bit | Bit |
|
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