NEC NP-M311W Command Manual page 5

[ HT/LT/NP40/VT70/VT80/VT90/WT ]
The PC CONTROL connector is a mini DIN 8-pin connector.
1 To TxD of PC
2
3
4 To GND of PC
5
6
7 To RxD of PC
8
* 2, 3, 5, 6, and 8 are used inside the projector.
[ GT/LT80/MT/NP1000/VT (except
VT70/VT80/VT90)/NP3150/NP905/NP600/NP4000/NP3250/NP610/NP2200/NP216/M300/P420/U300/V300 ]
The PC CONTROL connector is a D-SUB 9-pin connector.
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) |
+--------------+
|
| Projector |
|
| Data portion |Checksum|
|