Structure Of Command Text; Pdu Structure; Area Definitions; Type Code (Variable Type) - Omron E5AN Communications Manual

SECTION 2 CompoWay/F Communications Procedures

2.2 Structure of Command Text

■ PDU Structure

■ Area Definitions

■ Type Code (Variable Type)

2-6
An MRC (Main Request Code) and SRC (Sub-Request Code) followed
by the various required data is transferred to the command text.
Service Request PDU
MRC SRC Data
The MRES (Main Response Code) and SRES (Sub-Response Code)
are transferred to the response frame following the above MRC/SRC.
Data is then transferred following the MRES and SRES.
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.
Service Response PDU (Command Text Not Executed)
MRC SRC MRES SRES
MRES/SRES provides the response code. MRES/SRES are not output
when processing ends in a normal completion.
Areas comprise only the variable area.
The following tables show the variable area type codes.
Variable type (1 byte)
MSB
0 0
Access size
11: Double word
10: Word
Data
LSB
0 0
Area
0: Setup area 0
1: Setup area 1
Read/Write
0: Read only
1: Read/Write