I am an absolute beginner starting from the ground up trying to connect the RS-485 port from a Sierra Instruments mass flow controller (MFC) to the NI cDAQ.
The intended pathway that someone before me laid out for the connection is:
1) Cable from MFC COM1 to the 4-Port Ethernet Interface for RS485/RS422 (DB-9 to DB-9)
2) Ethernet cable from 4-Port Ethernet Interface for RS485/RS422 to NI cDAQ
I am struggling to understand exactly how the pins should be lined up for the 1st part of the interface. The pinout for MFC COM1 is given below:
The pinout for DB-9 male shown in NI's Serial Quick Reference Guide is shown below:
I am not sure which pins at the MFC side should connect to which pins at the ENET-to-485 side. The obvious one is ground-to-ground (Pin 7 to Pin 1). Beyond that I'm stumped. Trying to read up references online has just served to confuse me even more at this point...
Any help would be much appreciated!