Frames; Command Frames - Omron E5AR-T User Manual

Section 6 CompoWay/F Communications

6.2 Frames

Commands from the host computer and responses from the E5AR-T/ER-T take the form of frames that
conform to the CompoWay/F protocol. The data included in command frames and response frames is
described in this section.
In the following descriptions, an "H" following a numeric value (for example 02H) indicates that the value is
a hexadecimal number. Numbers or letters enclosed in quotation marks (for example "00") are ASCII data.

■ Command Frames

6-4
STX Node No. Sub-address SID
02H "00" "0"
Bytes: 1 2 2 1
BCC calculation range
A code that indicates the beginning of a communi-
STX cations frame (02H). Be sure to set this code in the
leading byte.
The node number specifies the destination.
Specify the unit number of the E5AR-T/ER-T.
Node No.
When broadcasting to all nodes, specify "XX."
Responses are not returned for broadcasts.
Sub-address Not used on the E5AR-T/ER-T. Always set to "00."
SID Not used on the E5AR-T/ER-T. Always set to 0.
(Service ID)
FINS-mini
The text of the command.
command text
ETX A code that indicates the end of the text (03H).
Block Check Character
BCC This byte stores the result of the BCC calculation
from the node number through EXT.
FINS-mini
STX Node No. SID
Sub-address command text
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
FINS-mini
command text ETX BCC
03H
1 1
ETX BCC