User manual

User Manual
man_905K_1.10.doc Page 17
• Analog value is transmitted if the measured value has increased by the configured sensitivity
amount since the last transmission
• Analog value is transmitted if the input value has not been transmitted within the update time
(10 seconds – 7 days)
• There is no paralysis time for the analog input.
2.4.6 Setpoint Status
The setpoint status is an internal status value, calculated by comparing the analog input to two
configurable setpoint values. The setpoint status turns ON when the analog input moves below
the low setpoint value, and turns OFF when it moves above the high setpoint value. The high
setpoint percentage must always be greater than, or equal to, the low set point.
The internal setpoint status will be determined every time an analog measurement is taken.
The setpoint status is treated as a digital signal and its value is transmitted according to the rules
for a digital input.
2.4.7 Supply Voltage
The 905K measures the supply voltage and stores it as an internal “analog” value. The range of
the analog value is 0 – 30 volts. The measurement is made every time the radio transmits (the
measured value is the “loaded” supply voltage) and the measurement is transmitted based on the
user-configurable update time - there are no change transmissions for this value.
2.4.8 Low Supply Voltage Alarm (Supply LowVolts)
If the voltage of the power supply falls below the pre-configured alarm value, the internal low
voltage alarm will turn on. The 905K provides user-configurable high and low setpoints for the
supply voltage value. If the supply voltage falls below the low SP, then the Supply Low Volts
status will turn on. When the supply voltage increases above the high SP, the status will turn
off. The low SP should not be set less than 5.7V.
The Supply Low Volts is treated as a digital signal and its value is transmitted according to the
rules for a digital input.
2.4.9 Supply Failure
The 905K will stop operating if the supply voltage falls below 95% of the Supply LOV value.
Prior to shutting down, the 905K will store the values of the pulse counters in non-volatile
memory. The unit will restart when the supply voltage has increased to the configured high SP
value.
2.4.10 Communications Failure
The 905K cannot provide an indication that its transmitted messages have not been received
successfully.
This indication is however available at the receiving 905U by using the 905U Output Reset on
Comms Fail function. To use this function, map an input that is not being used on the 905K to a