Sterlco A3 Blender Control and Data Acquisition Software - Manual (Page 27)

Page Number 27
The pin outs for the cables are as follows:
PC to 1st BLENDER
PIN9 PIN4
PIN1 PIN5
PIN2 PIN8
PIN3 PIN9
BLENDER to BLENDER
PIN4 PIN4
PIN5 PIN5
PIN8 PIN8
PIN9 PIN9
It is best to ring out every pin on every connector to ensure that it is wired
correctly and that there aren’t any shorts prior to connecting the cables to
each blender. Damage to your blenders can occur if you’ve wired this
incorrectly.
ALL CABLES MUST BE RAN IN CONDUIT