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Map Descriptor 

The current Map Descriptor being displayed out of the total  

Node_ID 

The Node ID used by this Map Descriptor when the driver builds read 
or write messages.. 

Protocol 

The protocol used by this Map Descriptor.  

Map_Descriptor_Name 

Used to identify a Map Descriptor by name. 

User_Address 

Allows a Map Descriptor to address remote device data at a specific 
start memory location. 

Length 

Alows a Map Descriptor address a number of remote device data 
locations from the start address. 

Block_Type 

Used by some drivers to indicate the data format used to pack a block 
of data, e.g. when reading a block of 4 bytes from a PLC and the 
Block_Type is Word, the incoming data will be interpreted as 2 words. 

Data_Array_Name 

The name of the Data Array where information will be stored to and 
retrieved from by the Map Descriptor. 

Data_Array_Offset 

The offset into the Data Array where data should be stored on reads or 
retrieved from on writes. 

Function 

The Map Descriptor function can be mainly read or write with a number 
of variations of each. Refer to the FieldServer Manual for other 
functions. 

Scan_Interval 

When using continuous Map Descriptor functions such as RDBC, this 
is the time a Map Descriptor will wait before polling for data again. 

Data_Array_Low_Scale 
Data_Array_High_Scale 
Node_Low_Scale 
Node_High_Scale 

Used in the scaling of data values before storing them or before 
sending them in write messages.  Consult the Driver manual to 
determine whether the driver supports scaling. 

Units 

Used to specify engineering units to interpret data if used.  Will display 
a dash if not used. 

Network 

Used by some drivers as a network number.  

Sector 

Used by some drivers as a sector number for rack addressing. 

Panel 

Used by some drivers as a panel number for rack addressing. 

Card 

Used by some drivers as a card number for rack addressing. 

 

Map Descriptor 

The current Map Descriptor being displayed out of the total. 

Scan Timer 

Value of scan timer used by driver for this Map Descriptor. This is for 
debugging purposes only and has no specific meaning.