5 . 8
■
F e a t u r e s
Wa t l o w P o w e r S e r i e s
Overview
A Power Series controller can also be programmed
and monitored by connecting it with a personal
computer or programmable logic controller (PLC)
via serial communications. To use this communica-
tions option, a Power Series must be equipped with
an EIA/TIA 232/485 (P_ _ _ - _ _ _ _ - 1 _ _ _)
communications board.
To view or change controller settings with a person-
al computer, you need to run software that uses the
Modbus™ RTU protocol to read or write to registers
in the controller. See Chapter Six, Parameters, for
the Modbus registers. These registers contain the
parameter values that determine how the controller
will function and the values that reflect the current
input and output values of the system.
Parameters relating to communications appear in
the Comms Menu (Setup Page). Match the Baud
Rate
[baud]
to that of the computer and select an
Address
[Addr]
(1 to 247, default is 1).
The Power Series supports a maximum read of up to
32 registers. See appendix A.8 for Modbus registers.
Communications
Summary of Contents for PC1X-N20
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