MC³ 24.96.EX O&M Manual Page 44 08/14/01 4:34 PM/LDD
External Sample Rate Parameters
The Pulse Divisor parameter is the actual number of pulses required to generate a PCAD sample.
For example, if this parameter is set to 10, it would take 10 pulses from tacho 1 for every A/D
sample. Limits are minimum of 1 and a maximum of 1000.
The Min Sample Time is the shortest sample time the A/D will sync to. The default value is 0.1
seconds which allows 10 samples per second. Limits are minimum of 0.10 and a maximum of 5.0.
The Max Sample Time is the longest sample time the A/D will sync to. The default value is 5.00
seconds which allows 1 samples every 5 seconds. Limits are minimum of 0.10 and a maximum of
5.0.
NOTE: If the incoming pulse period would generate a sample time that is higher or lower than the Max and
Min sample times, the sample rate will default to the Max or Min sample times, respectively.
External Totalizer Parameters
Divide Value
This is the value used to scale the pulse train to the EMT (External Mechanical Totalizer)
output. For every lb or kg that is totalized there is a pulse if the EMT Divide Value is set
to one (1). If EMT Divide Value is set to 100, there must be 100 pounds or kilograms totalized
before a pulse is sent to the external totalizer. Limits are minimum 1 and a maximum of 100,000.
Pulse Length
This value is the length in seconds for the pulse which is sent to the EMT. A mechanical totalizer
will require a longer pulse than a electronic. The pulse output from the controller is buffered, in
order to allow slow EMT’s to “catch up” and be accurate. The recommended value for a
mechanical totalizer is 0.10, and 0.01 for an electronic totalizer. Limits are minimum of 0.01 and a
maximum of 5.0. The duty cycle should be 50% at the full pulse rate.
Communications
Serial Communications provides the means to exchange information between the MC³
Controller and another device. For example, data in the MC³ Controller can be
exchanged with devices such as SuperBridge, for PLC connectivity. The rules and
format of the data exchange is described in [1].
Communications port 1 is used for communication with another intelligent device such as
SuperBridge, for PLC connectivity. Port 2 is used to send strings to a serial printer.
NOTE: Failure to program communications correctly can result in the operational failure of serial
communications.
For Baud Rate, Data Bits, Stop bits and Parity parameters, simply pressing the button for the
corresponding parameter will toggle through the list of available settings. For numeric parameters,
follow the direction given in the Numeric Entry Screen section found on page 9.
Baud Rate
The Baud Rate is the speed at which data is transmitted across the serial communications lines.
Available baud rates are:
300
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