RS485 CNC spindle control

My USB to RS485 adapter just arrived from China.
Will be able to test controlling the CNC spindle from the computer by MACH3 later today! 

Setting:
(remove tape from taped over keys,
 then press PRGM, enter the number of the value to change via UP,DOWN and <<, pres SET.
 You now see the current value.
 enter a new value via UP,DOWN,<< and press SET to change it.
 The device will leave PRGM mode on it's own after a few seconds)

PD163 "communication address"  1
PD164 "baud rate" 1 = 9600bps
PD165 "communication data method" 3 = 8N1 For RTU4
0=8n1 ASCII gives errors in Mach3 (don't know how because it's a one-way only communication)
3=8n1 RTU4 gives no errors but still the spindle doesn't react

PD001 "source of run commands" 2 = communication port (0=operator)

PD002 "source of operating frequency" 2=communication port (0=operator)
now it should work.

PD144 "rated motor revolutions" default=1440

• The setup I'm trying to reproduce 
• Original forum postings 
• required Mach3 plugin 
• .NET 3.5 required (else Mach3.043.022 tells me that plugin is defective and refused to load the dll. same issue as this one)
• Windows Installer 3.1 required by the previous installer
  
• Google+ posting