Omron G3PW, User Manual

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Frame Configuration Section 6-2
6-2 Frame Configuration
The communications protocol is the OMRON CompoWay/F protocol.
Commands from the host and responses from the G3PW are sent in data
packets called frames. The structures of the command and response frames
are shown below.
Command Frame
Format
Response Frames
BCC Calculation Example
Note No response will be returned unless the frame contains all elements up to the
ETX and BCC.
• The following notation is used for hexadecimal and ASCII text.
STX
1
02H
2 2
"00"
S I D
1
ETX
1
03H
BCC
1
Text
Unit No. Sub-address
FINS-mini command text
BCC calculation range
"0"
STX This code indicates the beginning of the communications frame.
Always set 02H.
Unit. No. • Set the unit number that is set on SW1 on the front of the
G3PW.
• No response will be received if another unit number is set.
Sub-address and
SID Not used by the G3PW. Always set to “0”.
FINS-mini
command text This text is the command. For details, refer to 6-3 FINS-mini Text.
ETX This code indicates the end of the communications frame.
Always set to 03H.
BCC This stores the result of the BCC calculation from the Unit No. to
EXT.
1
02H
2 2 1
03H
1 2
Text
STX Unit No.
Sub-address
End code
FINS-mini command text ETX BCC
BCC calculation range
"00"
=
02H 30H 35H 30H 30H 03H 35H
:
35H 03H = 35H
STX Unit No.
Sub-address SID FINS-mini command text ETX BCC
BCC
XOR (exclusive OR) calculation
30H 30H 30H 30H 30H
30H 30H 30H 30H 30H 30H 30H 33H
Hexadecimal The suffix H is added after the number, e.g., 02H
ASCII ASCII text is indicated inside quotation marks, e.g., “00”.