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FS-8700-17 Optomux Driver Manual
FieldServer Technologies 1991 Tarob Court, Milpitas, California 95035 (408) 262-2299 fax: (408) 262-9042
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Da_Byte_Name* Names a data array that the driver will
use to store poll/query response status
data.
One data element is used per map
descriptor. The element is determined
by the Data_Array_Offset parameter.
One of the Data Array names
from “Data Array” section above
Data_Array_Offset Starting location in Data Array 0 to maximum specified in “Data
Array” section above
Function Function of Client Map Descriptor RDBC, WRBC, WRBX
4.4.2 Driver Related Map Descriptor Parameters
Column Title Function Legal Values
Node_Name Name of Node to fetch data
from
One of the node names
specified in “Client Node
Descriptor” above
Address* This field is only required if the
address/length method of
module position specification is
used.
1..16
Indicating 1
st
to 16
th
module
position.
Length Length of Map Descriptor
Only some commands / queries
use the value of this map
descriptor parameter. This is
indicated in a table provide in
chapter 6.
For those commands and
queries that do use the Length
parameter the driver never uses
more than 16 elements of data
even if the length is set to a
larger number.
Although this driver does not
use the length parameter for
some commands the
FieldServer kernel does use
this parameter to ensure that no
more than one client map
descriptor has control of a
range of array data elements.
For this reason it is best to
always specify the length – in
these cases set it to 1.
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