NEC NP-P474U RS232 codes- Projectors - Page 5
HT/LT/NP40/VT70/VT80/VT90/WT ]
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[ 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 | | 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) | |