JVC DLA-RS45U Command Communication Specification for D-ILA Projectors (v1.7 f - Page 8

Protocol

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3 Protocol 3 Protocol 3.1 Communication specification Communication System Asynchronous Interface RS-232C Baud rate 19200 bps Data length 8 bits Parity None Stop bit 1 bit Flow control None Communication code ASCII character code ST b0 b1 b2 b3 b4 b5 b6 b7 SP 3.2 Data format Control commands consist of Header, Unit ID, Command, Data and End. (Refer to the below) *The length of the control command varies according to function. 1 byte Header 2 bytes Unit ID 2 bytes Command n+1 bytes Data[0] ... Data[n] Header: Indicates the start of communication (see paragraph 3.3, Header table). Unit ID: Specifies the device to be controlled. Command: See paragraph 3.5, Command table. Data [i]: Parameter corresponding to the command (data i = 0, 1, ., n). End: Indicates the end of communication. 3.3 Header table Added header varies according to type of control command. HEX 0x21 0x3F 0x40 0x06 ASCII '!' '?' '@' ACK Type Operation command Reference command Response command ACK Operation command: Added when there is an operation command notification. Reference command: Added when there is a reference command notification. Response command: Added when there is a response command notice in response to a reference. ACK: ACK response is given if the command reception is normal. 1 byte End 8 / 80 PJ03220107B

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3 Protocol
8 / 80
PJ03220107B
3
Protocol
3.1
Communication specification
Communication System
Asynchronous
Interface
RS-232C
Baud rate
19200 bps
Data length
8 bits
Parity
None
Stop bit
1 bit
Flow control
None
Communication code
ASCII character code
ST
b0
b1
b2
b3
b4
b5
b6
b7
SP
3.2
Data format
Control commands consist of Header, Unit ID, Command, Data and End. (Refer to the below)
*The length of the control command varies according to function.
1 byte
2 bytes
2 bytes
n+1 bytes
1 byte
Header
Unit ID
Command
Data[0]
…
Data[n]
End
Header:
Indicates the start of communication (see paragraph 3.3, Header table).
Unit ID:
Specifies the device to be controlled.
Command:
See paragraph 3.5, Command table.
Data [i]:
Parameter corresponding to the command (data i = 0, 1, ., n).
End:
Indicates the end of communication.
3.3
Header table
Added header varies according to type of control command.
HEX
ASCII
Type
0x21
'!'
Operation command
0x3F
'?'
Reference command
0x40
'@'
Response command
0x06
ACK
ACK
Operation command:
Added when there is an operation command notification.
Reference command:
Added when there is a reference command notification.
Response command:
Added when there is a response command notice in response to a reference.
ACK:
ACK response is given if the command reception is normal.