Marantz PD4201 ユーザーズマニュアル

  PDxx01  

       RS-232C Control Specification                                                      Page: 5 / 49 

 

 

 

 

 

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. 

 

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. 

 

Command 2 

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

 

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   

 

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. 

 

Command 1 

Unit ID 1 

Unit ID 2 

Command 2 

Data length 

Data 

Check sum 

8bit 

8bit 

8bit 

8bit

8bit

8bit

8bit

8bit

  Total 208H