Product manual for the SPKG interface board which is no longer available for sale. Production of the SPKG interface board was halted in June of 2003.
The SPKG interface board was replaced with the XIB-R (XIBR) product which is easier to use and provides better support for RS485 and RS422 interfacing.
For additional information about the differences see:
Differences between XIB-R and SPKG
Aug 08, 2017