Red Lion TCU - Manual (Page 10)

The optional RS485 multi-drop serial communication interface provides
two-way communication between a TCU unit and other compatible
equipment such as a printer, a programmable controller, or a host computer.
In multi-point applications the address number of each unit on the line can be
programmed from zero to ninety nine. Up to thirty-two units can be installed
on a single pair of wires. The Setpoint value, % Output Power, Setpoint Ramp
Rate, etc. can be interrogated or changed, by sending the proper command
code via serial communications. Alarm output(s) may also be reset via the
serial communications interface option. A programmable User Input is
available with RS485, Valve Position, Heater Current Monitor, and Second
Analog Input models. The User Input can be programmed to perform a variety
of controller functions.
An optional NEMA 4X/IP65 rated bezel is available for wash down
applications and similar environments, when properly installed. Modern
surface-mount technology, in-house assembly and testing, and high
immunity to noise interference makes the controller extremely reliable in
industrial environments.
SAFETY SUMMARY
All safety related regulations, local codes and instructions that appear in
the manual or on equipment must be observed to ensure personal safety and to
prevent damage to either the instrument or equipment connected to it. If
equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
Do not use the TCU to directly command motors, valves, or other actuators
not equipped with safeguards. To do so, can be potentially harmful to persons
or equipment in the event of a fault to the unit. An independent and redundant
temperature limit indicator with alarm outputs is strongly recommended. The
indicators should have input sensors and AC power feeds independent from
other equipment.
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