Connections in Detail
3-1
ANSI Port
The meter can have either Flag Port of ANSI Port. Standard Flag and ANSI read heads
should work with the meter. Please note that older EDMI ANSI read heads will not
work with the meter. To use a smart read head that can automatically switch polarity,
set the DTR line to be low – see Configure in the Site Properties section of the EziView
Basics chapter in the Atlas Software Reference Manual.
Inputs
The inputs may either be active, or passive. Passive inputs are isolated from all other
circuits, including the other inputs. There are a variety of input voltages that may be
ordered with the meter, e.g. 12V and 240V. Under voltage will cause the input to trigger
erratically or not at all, while over voltage will cause excessive heat dissipation and
possible damage to the meter.
The rated voltage is the voltage that must be applied between the two terminals of the
input. The inputs work with any polarity, and with AC or DC signals. There are a
maximum of 4 inputs.
Active inputs are also available as a factory option. They use power from the serial port,
and are thus not isolated from the serial port, or from each other. In this case simply
shorting between the input terminals will cause the input to trigger. The maximum
external impedance is 500 ohms. Note that power is drawn from the isolated serial port
supply, and will the inputs will not work while the serial port is powered down to cycle
power to a modem.
Outputs
There are several types of outputs available. All outputs are isolated from all other
circuits, including other I/O.
The SØ outputs are designed to switch up to 24VDC and 24mA.
The relay outputs are rated to 2A, 240VAC with an inductive load, or 5A, 240VAC for
the high current version. These outputs should not be used as pulsing outputs for
transmitting energy pulses, as the output contacts are subject to contact bounce and are
not rated for continuous switching.
The BOSFET outputs are rated up to 240V, 100mA. They may switch either AC or DC
voltages, any polarity.
Battery
The battery is used to run the clock during loss of power. It also allows the meter LCD
to be activated while main power is not available.
The meter comes with an optional internal battery. The internal battery is a 3.0V,
700mAh Lithium battery. There is no external battery option at this time.
The Mk10D Meter 3-13
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