Instrument Driver for Sierra's MFCs

Hey people:
I'm currently in the process of writing some Instrument Drievrs for sierra's mass flow controllers. The company sended a document that has all the instrument commands needed. This document specifies that, besides having to write the commands, I also need to include 2 CRC bytes + carriage retun.
I do not know what this means. If someone knows what they are talking about with CRC bytes and carriage return, please let me know. Help is much appreciated.
-Sergio

Hey everyone:
I know this isn't the right discussion board, but since I already started this post I'll continue to write on it. After much deliberation I finally wrote some instrument drivers for the Sierra Instruments' Smart Trak 2 Model 100 mass flow controller. Unfortunately, I haven't been able to test them because of problems with the instruments.
Attached to the document are two drivers: (1) to set the units, and (2) to establish the setpoint (flow-rate). It would be great if someone could see if they work and let me know. I've never written drivers before so they will probably have some problems. These are maybe in either the connections or the commands, or maybe in the MB-crc sub-VI that I got from a discussion board (which I've also attached).
If you have any questions, don't hesitate to ask. Please let me know what can be done to improve these drivers. Thanks.
-Sergio
Attachments:
units.vi ‏13 KB
Flow-Rate.vi ‏13 KB
NI_ModBus-crc SLS.vi ‏18 KB

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