Instruction manual

5. RKC COMMUNICATION PROTOCOL
IMR01H02-E3
18
3. Identifier (2 digits)
The identifier specifies the type of data that is requested from the controller.
For details, see 5.3 Communication Identifier List (P. 34).
4. ENQ
The ENQ is the transmission control character that indicates the end of the polling sequence.
The ENQ must be attached to the end of the identifier.
The host computer then must wait for a response from the controller.
(3) Data sent from the controller
If the polling sequence is received correctly, the controller sends data in the following format:
1. STX
STX is the transmission control character which indicates the start of the text transmission
(identifier and data).
2. Identifier (2 digits)
The identifier indicates the type of data (measured value, status and set value) sent to the host
computer.
For details, see 5.3 Communication Identifier List (P. 34).
3. Data
Data which is indicated by an identifier of this controller, consisting of channel numbers, data,
etc. It is expressed in decimal ASCII code including a minus sign (-) and a decimal point.
Channel number: 2 digit ASCII code, not zero-suppressed.
(Channel number: MA900: from 01 to 04, MA901: from 01 to 08)
Channels without channel numbers may exist depending on the type identifier.
In addition, in case of single mode, do not use the channel number.
Data: ASCII code. The number of digits varies depending on the type of identifier.
Multi-point mode: Zero-suppressed with spaces (20H).
Single mode: Not zero-suppressed.
Data structure of identifier with channel number (Only for multi-point mode)
A data is divided from that of the next channel with a comma.
For the identifier without the corresponding channel number, the same data is sent to the
host computer regardless of the channel number.
Identifier Data BCC
ETX
STX
3.2. 5.4.1.
DataChannel
number
Space
Comma
Channel
number
Space
Data
Comma
,,