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Frame Configuration
Section 6-2
6-2 Frame Configuration
The communications protocol is CompoWay/F.
Commands from the host computer and responses from the EJ1 are con-
tained in data blocks called frames.
The structures of the command and response frames are described below.
In the following explanations, hexadecimal values are expressed by adding
the suffix H after the number, e.g., 02H.
All other alphanumeric values in the explanations indicate ASCII characters.
Note CompoWay/F
CompoWay/F is OMRON's standard communications format for general
serial communications.
It uses commands compliant with the well-established FINS used exten-
sively with OMRON Programmable Controllers together with a consistent
frame format to facilitate communications between more than one compo-
nent and between personal computers and components.
FINS (Factory Interface Network Service)
The FINS protocol provides message communications between control-
lers in OMRON FA networks.
Command Frame
Format
STX This code indicates the beginning of the communications
frame.
Always set to 02H.
Unit No. • Set the unit number that is set on SW1 and SW2 on the EJ1.
• Specify “XX” for a broadcast transmission. No responses will
be returned for broadcast transmissions.
• No responses will be returned from unit numbers other than
the ones in the above range.
Sub-address Not used by the EJ1. Always set to 0.
SID Not used by the EJ1. Always set to 0.
FINS-mini com-
mand 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 The BCC calculation result from the unit number to the ETX.
STX
1
02H
2 2
0
SID
1
ETX
1
03H
BCC
1
Text
00
Unit No. Sub-address
FINS-mini command text
BCC calculation range
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