Structure Of Command Text - Omron E5AN User Manual

CHAPTER 2 CompoWay/F COMMUNICATIONS PROCEDURES

2.2 Structure of Command Text

J PDU structure
J Area definitions
J 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
MRES (Main Response Code) and SRES (Sub-Response Code) are
transferred following the above MRC/SRC. Data is then transferred
following these MRES and SRES.
Service response PDU (during normal operation)
MRC SRC MRES
If the specified command text could not be executed, only the MRC/
SRC and MRES/SRES become the target response PDUs.
Service response PDU (at non-execution of specified command text)
MRC SRC MRES
MRES/SRES becomes the response code except when processing
ends in "normal completion."
Areas comprise only variable area.
The following defines variable area type codes.
MSB
1 1 0
Access size
11: Double-word
The following table summarizes setup areas 0 and 1.
Area
Setup area 0 This area groups together the protect, operation and adjustment
levels.
Setup area 1 This area groups together the initial setting, communications set-
ting, advanced function setting and calibration levels.
Data
SRES
SRES
Variable type (1 byte)
0 0 0
Area
0: Setup area 0
1: Setup area 1
Description
Data
LSB
Read/Write
0: Read only
1: Read/write