Rockwell Automation 2755-SNx Adaptascan Bar Code Readers - Manual (Page 337)

17–15 Communicating with PanelView 900
t
Terminals on a DeviceNet Network
Publication 2755-6.8
Field Description Valid Characters Notes
Swap Bytes Only displayed when
Character Array data type is
selected. Check Box
•
when selected high and low data bytes swap
positions. Select swap bytes when data is sent in
the wrong order (high byte first). For example,
data from a PLC is sent with the first character of
a string in the second byte. By swapping the
bytes, the first character corresponds to the first
byte.
•
byte swapping is not generally used with
Explicit-Client message types. These addressed
devices will usually conform to DeviceNet
specifications and send data in the correct
sequence.
Swap Words Only displayed when Float
data type is selected. Check Box
•
when selected the high and low words of a
floating point value are swapped. This allows
floating point values generated by a PLC to be
properly displayed.
•
word swapping is not generally required for
DeviceNet devices that generate floating point
values.
Message Type Selects the message type. additional fields are required for Explicit message
types.
Instance Number
(Explicit-Server
Message Only) Select an Instance from 3 to
16. 3 to 16 instances 1 and 2 are assigned to I/O message
type.
Node Address
(Explicit-Client
Message Only) Specifies the node address of
the peer device. 0 to 63 node address range from 0 to 63.
Load from EDS
(Explicit-Client
Message Only) Loads information using the
Electronic Data Sheet. Refer
to page 17–17. we recommend that you load parameter data from
the data sheet for the peer device. Otherwise,
enter the tag information (class, instance, attribute,
etc) from the sheet manually.
Write Tag
(Explicit-Client
Message Only) When selected, tag is
specified as a write tag (data
sent to peer device). If Write Tag is not selected, tag is specified as a
read tag (data is read from peer device).
Packet Bytes
(Explicit-Client
Message Only) Specifies the number of bytes
in each message packet. 1 to 128 This value should match the amount of data in the
attribute addressed in the external device.
Bit Offset
(Explicit-Client
Message Only) Specifies the offset that
indexes into the returned
data. Typically this value is
0. bit offset is limited to the number of bytes specified
for the Packet Bytes (i.e. if packet bytes is 2, Bit
offset must be 0-15).
Class
(Explicit-Client
Message Only) Enter from device data sheet
specifying the Class of the
object being addressed. recommend that you load information from
electronic data sheet (EDS) automatically if
possible.
Instance
(Explicit-Client
Message Only) Enter from device data sheet
specifying the Instance of the
object being addressed. recommend that you load information from
electronic data sheet (EDS) automatically if
possible.
Attribute
(Explicit-Client
Message Only) Enter from device data sheet
specifying the Attribute of the
object being addressed. recommend that you load information from
electronic data sheet (EDS) automatically if
possible.
Table continued on the next page.