Renishaw RCU10, Installation And User Manual, Page: 104 / 202

Connector pinout and hardware installation details B-13
B.7 PC port (J8)
B.7.1 Connector pinout
5-way female binder 712 series. The connector is viewed from the wiring side.
Table B.7 – J8 connector pinouts (PC port)
Pin Function
RS232 RS422/485
1 RXD
2 0 V 0 V
3 Data
4 /Data
5 TXD
Shell Case Case
B.7.2 Wiring requirements
The PC interface uses an asynchronous serial data format with a data rate of 19.2 kbaud.
The PC port may be used with either a standard RS232 interface or an RS485 interface –
all terminals are protected against a single fault short circuit to another terminal.
The RCU10 is supplied with a standard RS232 PC cable assembly (A-9904-1456) of 1 m
in length. If the standard cable is too short, custom RS232 cables should be constructed
using multi-conductor cable with an overall shield e.g. Belden 9925.
If the interface is longer than 10 m, it is recommended that the RS485 interface be used
instead of the RS232 interface (maximum cable length of 50 m). These should be
constructed using a twisted pairs cable that has an overall shield e.g. Belden 8102 or
Belden 8132. For a simple network with one RS485 controller and one RCU10, a cable as
specified in EIA RS 422 would be suitable. For a more complex RS485 network, then
follow the guidelines in EIA RS485.
The RCU10 terminates one end of the interface. In most cases this should be sufficient,
however, for fault-free communication over very long runs, the user may need to
terminate the other end. Either of the following terminations may be used:
• An ac termination using a 100 Ω – 120 Ω resistor in series with a 1 nF capacitor.
• A dc termination using a 100 Ω – 120 Ω resistor.
1
2 4
5
3