Renishaw RCU10, Installation And User Manual, Page: 101 / 202

B-10 Connector pinout and hardware installation details
B.5 Reference switch port (J4)
B.5.1 Connector pinout
4-way binder 712 series. The connector is viewed from the wiring side.
Table B.5 – J4 connector pinouts
(reference switch port)
Pin Function
1 Input return
2 0 V
3 +5 V supply – thermal fuse protection
4 Input
Shell Case
B.5.2 Wiring requirements
A multi-conductor cable with overall shield is recommended for the reference switch port
interface e.g. Belden 9925.
The interface is isolated and consists of four terminals; the power and its return and the
signal and its return. To make the reference activate, the interface should to be used with
a reference switch that allows the current to flow when at reference. A transistor switch
may also be used – this includes P or N type devices arranged as open collector or open
drain.
A bipolar driver may also be used – in this instance, the thresholds are ON by 3 V and
OFF by 1 V (these are not TTL thresholds).
When driven by an external supply voltage, the reference port is protected to ±10 V dc.