Details Of Services - Omron E5AN User Manual

CHAPTER 2 CompoWay/F COMMUNICATIONS PROCEDURES

2.3 Details of Services

J Read from
variable area
2--8
This service reads from variable areas.
Service request PDU
MRC SRC
Variable
type
0 1 0 1
2 2 2
Service response PDU
MRC SRC Response
code
0 1 0 1
2 2
(1) Variable type and read start address
For details on variable types and read start addresses, see "Chapter 3
Communications Data."
(2) Bit position
Bit accessing is not supported on the E5AN/EN/CN/GN. Fixed to
"00".
(3) Number of elements
Number of
elements
0000 Read is not carried out (the service response PDU is not
appended with read data), and processing ends in "normal
completion."
0001 to 0002 Read is carried out, and processing ends in "normal completion."
(4) Response code
At normal completion
Response code
0000
At occurrence of error
Response code
1001
1002
1101
1103
110B
1100
2203
Read start
Bit
position
address
0 0
4 2
Read data
(for number of elements)
4 0 or 8 or 16
Process
Name
Normal completion
Error name
Command too long
Command too short
Area type error
Start address out-of-
range error
Response too long
Parameter error
Operation error
Number of
elements
4
Description
No errors were found.
Cause
The command is too long.
The command is too short.
The variable type is wrong.
The read start address is
out of range.
The number of elements is
larger than "0002".
The bit position is other than
"00".
EEPROM error