PDxx01

RS-232C Control Specification

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Document Version [1.0]

3. Communication Format

8bit 8bit 8bit 8bit 8bit 8bit

Command 1

Unit ID 1

Unit ID 2

Command 2

Data length

Data

Check sum

8bit 8bit

3-1.Command1

Command 1, along with command 2, is a number used to distinguish each command.

Bit1, Bit0: 11B or 10B :Usually, a form

In the case of ACK, when the lower order 4 bits is FH (as in 3FH and 7FH), this indicates that the commands and data of the supported equipment have been received. When the lower order 4 bits is BH (as in 3BH and 7BH), this indicates that unsupported commands and data have been received.

3-2.Unit ID1,2 (UA1,UA2)

Unit ID 1 and unit ID 2 are numbers used to identify the equipment that is to be connected.

60H is used for the plasma monitor and 80H is used for external control equipment such as a personal computer.

3-3.Command 2

Command 2, along with command 1, is a number used to distinguish each command.

3-4.Check Sum (CKS), Error Processing, and ACK

1)The check sum described below and RS-232C odd parity are used together for a check of the received data. The check sum is the lower order 8 bits of one frame of sent or received data comprising the sum total of Command 1, Unit ID 1 and 2, Command 2, Data Length, and Data.

Check Sum Example

DFH

80H

60H

47H

01H

01H

08H

Command1

Unit ID1

Unit ID2

Command2

Data Length

Data

Check Sum

 

 

 

 

 

 

 

Total 208H

2)Error Processing

When the communication interval is vacant for more than 4 ms, thereafter a received Command 1 will be recognized. If, at this time, meaningful data cannot be recognized, that data will not be recognized (as valid data).

An ACK will not be returned unless the receive data error, the check sum error, and the receive data are all taken in.

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Marantz PDxx01 specifications Command1, Unit ID1,2 UA1,UA2, Check Sum CKS, Error Processing, and ACK