Azbil SDC35 - 7-3 Description of Commands

7-7
Chapter 7. CPL COMMUNICATION FUNCTION

Continuous data read command (RS command)
This command reads data of continuous addresses by a single command.

Send message
This command enables the content of continuous data addresses starting with the
specified read start address to be read as a single message. The figure below shows
the structure of the application layer of the send message when the data is read.
(2)(1) (3) (4)
Application layer
(1) Continuous read command
(2) Data delimiter
(3) Data address
(4) Number of read data
R
0S , 1 5 1 W , 1
(2)

Response message
If the message is correctly received, a response message corresponding to the
command content is returned.
The figure below shows the structure of the application layer of the response
message when the data is read.
0
• Normal termination (reading of single data item)
0
• Normal termination (reading of multiple data items)
0 0
• Abnormal termination
X X
The abnormal termination code is entered at XX.
For details of codes,
(2)(1) (3)
(1) Termination code
(2) Data delimiter
(3) Data
(4) Data 2 to (n-1)
(5) Data n
,
(1) (2) (3) (4) (5)
, , ,
(2) (2)
(1)
7 - 6 List of Termination Codes (p.7-15).

Maximum number of read data per message
Up to 16 words for both RAM and EEPROM areas
7 - 3 Description of Commands