JVC VR-509E Electrical Specifications, Sub 9-pin Connector Specifications, Data Format

RS-232C Interface

1.Electrical Specifications

1.D-Sub 9-pin Connector Specifications

Pin No.	Signal	Operations	Signal Direction
3	TXD	Sending data	HDR → CPU
2	RXD	Receiving data	HDR ← CPU
6	DSR	Data set ready	HDR ← CPU
5	GND	Signal earth
4	DTR	Data terminal ready	HDR → CPU

Output level
OFF: —5V or less	1 2 3 4 5
ON : +5V or more

6 9

2.Data Format

Mode:Asynchronous

Character Length:

8bit

Configuration

Parity Check:

None

0(SPACE) Start

Stop

Stop Bit:

1bit

bit

D

D

D

D

D

D

D

D

bit

0

1

2

3

4

5

6

7

Data Speed:

9600bps

1(MARX)

3.Command Format and ACK/NAK

Control: No control sequence

TXD

RXD

CMD Para1 Para2

ACK

ACK ACK

200ms

•The ACK (NAK) response will be returned within 200ms for a 1byte transmission command from the CPU.

•The NAK response is returned only when a non-defined command is received (however, NAK is returned for certain commands depending on the status.)

•The parameters for data that have elapsed for five or more seconds after the previous receipt are not recognized as parameters.

•Only one retry is made when a time-out is triggered. In this event, the resending is performed from the first byte of the relevant command.

4.SENS Commands

TXD

RXD

CMD

DATADATA

200ms

200ms

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