Communications Installation - Connecting the Operator Interface to the Controller
Revision 19 HC900 Process Controller Installation and User Guide 121
06/14
Connecting the Operator Interface to the Controller
Using parts in Table 18 connect the Operator Interface to the RS-485 port on the controller for legacy
systems. For new systems, the parts in Table 18 connect to either of the two RS-485 ports on the controller.
See page 35 for port location. Typically, the cable that interconnects this port to the Operator Interface must
be made during installation, because it will probably be necessary to run the cable through conduit.
On C75 connect cable from each CPU’s RS-485 port to the Operator Interface. See Operator Interface
manual #51-52-25-108 for connection details.
Table 18 – Parts needed to make RS-485 Cable
Part # Quantity Description
Belden #9271 (or equivalent),
with 120 ohm resistors (2,000
feet Maximum)
Or
Belden #9182 (or equivalent),
with 150 ohm resistors (4, 000
feet maximum)
Variable Commercially available communication
cable
1 10-terminal connector (Supplied with the
operator interface)
Phoenix #1840379 (or
equivalent) for C30/C50
Phoenix 1803581 for C75.
1
Connector (3-pin) (Supplied with the
controller CPU module)
047260 1 Ferrite cable clamps (Supplied with the
operator interface)
089037 2 Nylon cable ties
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