BACstac/Win can support MS/TP when used together with our U+4 Field bus interface.  This is an intelligent RS485 to USB converter which emulates an Ethernet NIC card.

BACstac/32 includes source code for implementing MS/TP but these are in the form of examples which need to be modified depending on your hardware.  It has been our experience that the code we supply is approx. 90% of the MS/TP solution for your project.