FieldServer FS-8700-80 - Manual (Page 18)

McQuay Micro Tech Open Protocol Driver Manual Page 18 of 43
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
Tel: (408) 262 2299 Fax: (408) 262 2269 Toll Free: (888) 509 1970 email: [email protected]
6.3 Client Side Map Descriptors
6.3.1 FieldServer Related Map Descriptor Parameters
Column Title Function Legal Values
Map_Descriptor_Name Name of this Map Descriptor Up to 32 alphanumeric characters
Data_Array_Name
Name of Data Array where data is to be
stored in the FieldServer One of the Data Array Names
specified in Section 5.
Data_Array_Offset Starting location in Data Array 0 to maximum specified in Section 5.
Function Function of Client Map Descriptor Rdbc, Wrbc, Wrbx
6.3.2 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 Section 6.2.
Length*
This parameter normally refers to the length of Map Descriptor. Since
one data field can be read or written per poll/response sequence, the
driver assumes a length of 1. When Bytes_Per_Field is specified, must be
set to 1. When used to read addresses (Appendix A.3), this parameter is
used to specify the number of data elements to be read.
Any positive
integer, 1.
Field_Name*
The name of the data field of interest. Each address with meaningful
data in the McQuay device has a name. The field names are defined in a
specification for each device type. If the field name is unknown, the
Address can be defined. Refer to Appendix A.2 for further information.
A field name
from Appendix
C.3, Everything,
Device_Scaling*
If set to No then the driver stores the raw values, if set to Yes, the data is
scaled before storing. Refer to Appendix A.1.2 for information on the
device scaling applied. Note that ‘Device_Scaling’ has no meaning when
writing to a McQuay device. The Device_Scaling keyword needs to be
used in conjunction with Field_Name
Yes, No
Address*
The address in the McQuay device that contains the data of interest. .
Used with direct addressing – refer to Appendix A.2. Any positive
integer, -
Bytes_Per_Field*
This parameter is used with direct addressing. When reading, up to 4
consecutive address locations in the McQuay device can be combined
and stored in a single Data Array element. When writing, one value from
the Data Array may be sent to up to 4 consecutive address locations in
the McQuay device. Refer to Appendix A.2 for more information. If this
parameter is specified, length must be set to 1.
1, 2, 3, 4
6.3.3 Timing Parameters
Column Title Function Legal Values
Scan_Interval Rate at which data is polled >0.1s