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RSTi-OM User Manual
GFK-3212A
RdWrControlType
Index
Subindex
Datalength
Data
Integer (16-Bit Word) ISDU Response Command Format
The following table shows an integer (16-bit word) ISDU response command format with SLC,
MicroLogix, PLC-5, or Modbus/TCP.
Name
Status,
Byte-Swapping,
RdWrControlType
Functionality Descriptions
Provides the control and type of ISDU request
Bits 0-3, Type Field:
0 = NOP (No operation) 1 = Read operation
2 = Write operation 3 = Read/Write "OR"
4 = Read/Write "AND"
Bits 4-7, Control Field:
0 = Single/Last Operation (length can vary from to 1 to 232) 1
USINT
= Nested batch command – fixed 4 byte data area
2 = Nested batch command – fixed 8 byte data area 3 =
Nested batch command – fixed 16 byte data area 4 = Nested
batch command – fixed 32 byte data area 5 = Nested batch
command – fixed 64 byte data area
6 = Nested batch command – fixed 128 byte data area 7 =
Nested batch command – fixed 232 byte data area
The parameter address of the data objects in the IO-Link
UINT
device.
The data element address of a structured parameter of the
UINT
data objects in the IO-Link device.
Length of data that was read or written.
UINT
For nested batch commands, the data length can vary from 1
to fixed data area size.
Data required for read commands. Optionally can return the
An array of
data of a write command.
USINTs,
The size of the array is determined by the Control field in the
UINTs, or
RdWrControlType.
UDINTs.
Note: Data field not required for single NOP commands.
Data Type
Parameter Descriptions
Indicates the control, type, byte-swapping, and status of
the ISDU command.
Bits 0-3, Type Field:
0 = NOP (No operation) 1 = Read operation
2 = Write operation 3 = Read/Write "OR"
4 = Read/Write "AND"
Bits 4-7, Control Field:
0 = Single/Last Operation (length can vary from to 1 to
232) 1 = Nested batch command – fixed 4 byte data area
2 = Nested batch command – fixed 8-byte data area 3 =
Nested batch command – fixed 16-byte data area 4 =
Nested batch command – fixed 32-byte data area 5 =
UINT
Nested batch command – fixed 64-byte data area
6 = Nested batch command – fixed 128-byte data area 7 =
Nested batch command – fixed 232-byte data area
Byte swapping, bits 8-11:
0= No byte swapping.
1= 16-bit (INT) byte swapping of TX/RX ISDU data. 2= 32-
bit (DINT) byte swapping of TX/RX ISDU data.
Status, bits 12-15:
0 = NOP (No operation)
1 = In process (Only valid for non-blocking requests) 2 =
Success
3 = Failure: IO-Link device rejected the request. 4 = Timed
out: IO-Link device did not respond
Section 13
Jun 2021
141
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