JVC DLA-HD550 - Manual (Page 50)

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50
RS-232C Interface
Control of this unit via a computer is possible by connecting the computer to this unit with a RS-232C
cross cable (D-Sub 9 pin).
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PC refers to the controller such as a personal computer.
Command Format
The command between this unit and the computer consists of “Header”, “Unit ID”, “Command”, “Data” and “End”.
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Header (1 byte), Unit ID (2 bytes), Command (2 bytes), Data (n bytes), End (1 byte)
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Header
This binary code indicates the start of communication.
Binary code Type Description
21 Operating command PC→This unit
3F Reference command PC→This unit
40 Response command This unit→PC
06 ACK
This unit→PC
(When the command is accepted without error, it returns to
PC)
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Unit ID
This code specifies the unit. The binary code is fixed at “8901”.
RS-232C Specifications
Pin No. Signal Function Signal Direction
2 RxD Receive data PC→This unit
3 TxD Transmit data This unit→PC
5 GND Signal ground -
1,4,6 - 9 N/C - -
Mode Non-synchronous
Character Length 8 bit
Parity None
Start Bit 1
Stop Bit 1
Data rate 19200 bps
Data format Binary
This unit
Start Bit Stop Bit
D6 D7 D4 D5 D2 D3 D0 D1