Structure Of Command Text; Pdu Structure; Addresses; Number Of Elements - Omron ZEN-8E Communications Manual

SECTION 2 CompoWay/F Communications Protocol

2.2 Structure of Command Text

■ PDU Structure

■ Addresses

■ Number of Elements

14
• An MRC (Main Request Code) and SRC (Sub-Request Code) followed
by the various required data are transferred in the command text.
Service Request PDU
MRC SRC
• The MRES (Main Response Code), SRES (Sub-Response Code),
followed by the data are transferred following the above MRC/SRC in
the response frame.
Service Response PDU (Normal Response)
MRC SRC MRES SRES
• If the specified command text could not be executed, the service
response PDU will contain only the MRC/SRC and MRES/SRES.
Note: MRES/SRES provides the response code. MRES/SRES is not
output when processing ends in a normal completion.
Service Response PDU (Command Text Not Executed)
MRC SRC MRES SRES
An address is appended to each of the variable types. Express
addresses in 2-byte hexadecimal and append them for the specified
access size.
Specify the number of elements as "0001" (fixed). The number of
elements is expressed in 2-byte hexadecimal.
Data
Data