Mettler Toledo IND780 Guide D'installation page 67

The control outputs are 7407 open-collector drivers. Each control O/P is capable of sinking 40 mA.
The Max off state O/P voltage is 30V. This enables the control O/P to drive interposing relays such
as those by Opto-22.
Each flow meter board in an IND780 has its own unique address, assigned automatically by the
IND780. Each flow meter board has two isolated input channels. Each IND780 can accommodate
up to two flow meter boards, for a total of 4 isolated input channels per terminal. The IND780
terminal supports up to four channels in any combination of scales and flow meters.
Flow meter channel configuration is performed using the front panel of the IND780. Please refer to
Chapter 3, Configuration, for detailed instructions.
2.7.5.1.1. Features
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Two individually isolated input channels
Jumper selectable 15 kHz analog RC filter for each input
Four jumper selectable input switching thresholds (0.0V, 2.3V, 6.0V, 8.0V)
Input frequency: AC 50 kHz Max or DC
Maximum count value: 4,294,967,295
Channel update time of 5 msec/channel maximum
Frequency output mode
Two open-collector output switches
Current limited 5V output power
Input to backplane isolation of 750VDC
Input channel to channel isolation of 750VDC
Easy calibration using actual throughput or calculated settings
Power supply: The digital circuitry runs off the system's +5V supply; the isolated input circuitry
is powered by the system's 12V supply.
METTLER TOLEDO IND780 Installation Guide
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