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FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web:www.fieldserver.com
Tel: (408) 262-2299 Fax: (408) 262-9042 Toll_Free: 888-509-1970 email: support@fieldserver.com
5.4. Driver Limitations and Exclusions
As a client:
• The Carrier DataLink driver is not capable of polling for alarm data. (The RA and AV
functions are not implemented).
• The Carrier DataLink driver dos not validate table or variable names.
• The Carrier DataLink driver does not support the Read Table command with the /C or /N
options.
• The Carrier DataLink driver records a timeout if the DataLink device does not provide the
‘?’ prompt within the user-configurable timeout period.
• Write-thru’s are not supported. The reason for this is that the driver read a composite
data set and the client side Map Descriptors do not contain enough information to format
a write.
As a server:
• The Carrier DataLink driver is not capable of serving alarm data. (RA and AV polls
produce an error response)
• The driver cannot set a discrete variable’s state unless it is set a value of one or zero.
• The driver server does not understand write table or write variable requests where the
requested state is a word like ON or OFF.
• The Carrier DataLink driver does not validate values or states, it simply stores the
values.
• All variables are may be read and written without limitation. The driver has not
implemented the Courier notion of Force Levels.
• There is no command buffer. One command can be processed at a time.
• The driver responds to all Read Table commands as if the /Y option was used. The
driver does not support the /C or /N options.
• The Carrier DataLink driver does not support the control character commands CTRL-
C/S/Q
General
• The Carrier DataLink driver is not capable of configuring the DataLink device. Software
provided by the Carrier Corporation is required to do this. The DataLink device requires
configuration, so that connects to the appropriate CCN devices on the CCN
communications network.
• The driver cannot be configured to act as what the Carrier Corporation identify as an
‘Alarm Acknowledger’.
• If the total length of the response from a read table query is more than 3000 bytes long,
the driver will produce an error.