Operation
36 Rev. E2 04/2011 Marathon MR
6.3 Inputs and Outputs
6.3.1 Milliamp Output
The milliamp output is an analog output you can connect directly to a recording device (e.g., chart
recorder), PLC, or controller. The analog output resolution for all models is 0.5°C or 1°F. The mA
output can be forced to a specific value, underrange, or overrange with a RS485 command. This
feature is useful for testing or calibrating connected equipment.
6.3.2 Relay Outputs
The relay output is used as an alarm for failsafe conditions or as a setpoint relay, refer to Section
10.2 Fail-Safe Operation, on page. 50. Relay outputs relate to the currently displayed temperature on
the LED display. The relay output can be used to indicate an alarm state or to control external actions.
The relay can be set to either NO (Normally Open) or NC (Normally Closed) with a 2- way RS485
command (depending on the compatibility requirements of connected equipment). The relay can be
forced on or off via the 2-way for testing connected equipment.
6.3.3 Trigger
Peak Hold can be Reset by shorting the Trigger input (labeled TRIG) to Ground (labeled GND) for a
minimum of 10 msec. This can be done either with a momentary switch or a relay. Peak Hold has to be
set to 300.0 seconds to recognize this Reset. The Reset signal will cause the peak reading that the
sensor is holding to change immediately to the current target temperature.
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