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FS-8704-09 SNMP Driver Manual Page 21 of 39
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
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Non-COV Traps
The FieldServer can be configured to send a trap periodically or when a data is updated. A data update occurs when one protocol reads data
from a remote device and the data is stored in a Data Array regardless of whether the data has changed or not. Each Trap Map Descriptor must
specify the destination of the Trap by configuring a Remote_Client_Node_Descriptor, as shown in the example below. The OID to which the data
value is to be bound in the Trap message is specified in the Map Descriptor.
First, the Trap destination Node is set up as follows:
Remote_Client_Node_Descriptors
Node_Name, Node_ID, Protocol,
Adapter, IP_Address
NM_1, 1, SNMP, N1, 192.168.1.174
The Trap Map Descriptors are then configured as below:
Map_Descriptors
Map_Descriptor_Name, Data_Array_Name, Data_Array_Offset, Function, Node_Name, SNMP_OID, SNMP_Write_as_Trap, Data_Type, Length
PSU_Voltage_Alarm, DA_AI3, 0, Wrbx, NM_1, 1.3.6.1.4.1.6347.1.1.0.0, Yes, Integer, 1
Wrbx to write on
update.
Use Wrbc and add a
Scan_Interval to
have the trap send
periodically.
This is what tells the
driver that this is not
a normal write and
that the message
should be sent as a
trap.
Integer value or ASCII strings may be sent. If sending
an ASCII string keep the length as one but note that
the driver starts at the specified location and proceeds
element by element of the Data Array building the
string until it finds a zero which it regards as the marker
for the end of string. If using Wrbx as the function the
message is only sent when the 1
st
element is updated.