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FS-8700-42_Spectronics Driver Manual Page 13 of 15
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Appendix A. Advanced Topics – Spectronics
Appendix A.1. Default Data Types
When a Spectronics address range is specified, a particular Data Type is implied. The
defaults are as follows:
Address range Data_Type Function Code (Write) Function Code (Read)
40001 - 49999 Register 16 3
30001 - 39999 Analog _Input n/a. 4
10001 - 19999 Digital_Input n/a. 2
00001 - 09999 Coil 15 1
Appendix A.2. Single Writes
When writing the default data types can be overwritten using the “Single_Coil” and
“Single_Register” settings as part of the Map Descriptor configuration. In that case the
Function codes for writes will be as follows:
Address range Data_Type Function Code (Write)
40001 - 49999 Single_Register 6
30001 - 39999 Coil 5.
Example: FC 6 = Write Single Register
Add a parameter to the Spectronics client side Map Descriptor called Data_Type.
If you specify the Data_Type as Single_Register and the Function as WRBC or WRBX,
then a Spectronics poll with FC 6 will be generated.
Of course Single_Register implies a length of one, and even if you try to set the length
longer in the csv file, the length is limited to 1 in the driver.
Appendix A.3. Write-Thru Operation
Consider a client Map Descriptor that is configured to read data using a FC 3 (Read Multiple
Register) operation. It is now possible do a write thru operation on the existing Client Map
Descriptor by storing data to the Client Map Descriptors Data Array.
The Write Cache Map Descriptor that is created will use the following function codes
depending on the Cache Map Descriptor Length and the Clients Node Type.
Single Register Write - FC 6 - When the length of the Cache Map Descriptor is one. This will
normally be the case.
Multiple Register Write – FC 16 - When the length of the Cache Map Descriptor is larger
than one or the Node_Type has been set to “Block_Mode”.