Command communications sequence – NEC GT2000 User Manual
Page 27
E-27
(1) Command (PC to Projector)
Command specification code
Unit address
Function number
Data length Data .............. CKS
(2) ACK (Projector to PC)
*When there is return data
Command specification code
Unit address
Function number
Data length Data ............. CKS
*When there is no return data
Command specification code
Unit address
Function number
00H
CKS
(3) Receive error (Projector to PC)
Command specification code
Unit address
00H
01H
EC (Error code)
CKS
Command Communications Sequence
When a command sent from the personal computer has been correctly received by the projector, an "ACK" is returned for the command.
When the command has not been received correctly, a "Receive Error" is sent back. An invalid command will cause a "Command Error".
Note: When an"ACK" from the projector is not confirmed and the next command is received by the projector, an error in
communication can result.
Command
ACK
Receive error
EC (Receive Error Codes)
02H : Command error
04H : Checksum error
08H : Busy
10H : Parameter error
20H : Run error
40H : Receiving error on
Projector
Note: For a complete PC Control Command Reference, see page E-83.