49
6. Communication interfaces
6.3 Pulse outputs
(See Fig. 3, page 8)
E
V
Heat meter or cooling meter
E = Energy pulse (white)
V = Volume pulse (green)
Ground (brown)
EC
EH
EC
V
or
Cooling & heat meter
EC = Energy pulse cold (white)
EH = Energy pulse heat (green)
V = Total volume (green)
Ground (brown)
EH
EC
EH
V
or
Heat & cooling meter
EH = Energy pulse heat (white)
EC = Energy pulse cold (green)
V = Total volume (green)
Masse (brown)
The pulse outputs are open-collector circuits. The collector branch contains only 0-ohm-resistance, i.e. there is no internal
current limiting. If required, this must be provided by an external protective resistance (see example Fig. 4, page 9).
The internal resistance of the switching device must be 5x the resistance value of the protective resistance
(see "9. Technical data" at page 59).
GB
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