Jacob

Still not having much luck so if you could find that wiring diagram that would take away a large part of the variable we still have. Thanks for the help though!

Everything is set correctly and still does not work...

Thanks you guys I will try both of those and get back to you about how it goes!

Thanks Tim for responding. I have looked into that and although I am not sure I understand it fully I have set MAX for two leads on auto. I get something back but it is not what I put in or close

Hi, I have a 1179A MKS MFC with RS-485 serial connection. I am trying to control this MFC through labview. I have a NI PCIe-8431/8, 8 Port, RS485/RS422 Serial Interface that I trying to communicate through. The MFC uses an RJ-11 cable for its digital RS485 communication. There is ground, D+, and D- pins that I have isolated coming out of the RJ11 and have a converter for a DB9 connector. I have tried a number of different pin connections in an attempt to communicate with the MFC all of which do not seem to work, mostly focusing on combination's of connecting the D+ to RXD+ or TXD+ and the D- to RXD- or TXD-. Using VISA I try to send a command to the MFC and I read what appears to be totally random responses. Not sure what I am doing wrong but MKS does not seem willing to provide much support so any help would be great! There is the correct power going to the MFC as well. Thanks Jacob