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Section 6 Communication (CompoWay/F)
6.2 Frames (Communication/CompoWay/F)
Based on CompoWay/F protocol, commands from the host computer and responses from the E5AR/ER
take the form of frames.
The data comprising command frames and response frames are explained below.
In the following explanation, an "H" following a numeric value (for example 02H) indicates that the value is
a hexadecimal number. A number or letters enclosed in quotation marks (for example "00") is an ASCII
character.
■ Command frame
STX Node No. Sub-address SID
02H
1
2
FINS-mini
command text
ETX BCC
"00"
"0"
03H
2
1
1
1 byte
BCC calculation range
Communication
(CompoWay/F)
STX
Node No.
Code that indicates the beginning of the communication frame (02H).
Be sure to set this code in the leading byte.
This number specifies the destination.
Specify the Unit No. of the E5AR/ER.
When broadcasting to all units, specify "XX".
Responses are not sent to a broadcast.
Sub-address
Not used on the E5AR/ER. Be sure to set to "00".
SID
(Service ID)
Not used on the E5AR/ER. Be sure to set to "0".
FINS-mini
Command text
The text of the command.
ETX
Code that indicates the end of the text (03H).
BCC
Block Check Character.
This stores the result of the BCC calculation from
Node No. to EXT.
STX Node No. Sub-address SID
FINS-mini
command text
ETX BCC
02H 30H 30H 30H 30H 30H 30H 35H 30H 30H 03H 36H
BCC = 30H + 30H + 30H + 30H + 30H + 30H + 35H + 30H + 30H + 03H = 36H
+: XOR (exclusive OR) operation
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