Compac C4000

Appendix A
RS485 Wiring
Compac Industries Ltd.
Page 73
www.compac.co.nz
RS485 Wiring
The following changes are made to standard Compac dispensers to allow
the use of RS485 communication with other devices.
C4000 Power Supply
1) An RS485 Board is fitted inside the Power supply flame proof box.
2) The IS cable pinouts will need to be changed as detailed below. An extra
red wire will need to be added to link pin 5 on J1 with pin 4 on J5
Figure 4: J1 RS485
Figure 5: J5 Power Supply
C4000 Processor
1) Special software to support the Micromotion CNG50 meter will need to be
installed. Please contact the Compac Helpdesk for the latest version.
2) The IS cable will need to have The Red / Black / White cable removed
from J2A and put into pin 6 of J2B.