3.8 General Wiring connections
This section describes the pulse outputs from EC350.
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Three Form-A volume pulse outputs
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One Form-B alarm output
These outputs are electronic switches. The first three pulse outputs are configured as either corrected
volume or uncorrected volume. The fourth pulse output is used only for alarm output.
Note: Outputs are conventionally called “pulse outputs”, but it should be understood that they are
actually solid state (transistor) switches and do not produce any voltage. The external device to which
they are connected must provide wetting voltage with current limiting, and be able to respond to the
contact closures.
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Pulse output communication
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Pulse output specification
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Pulse outputs via the case connector option
3.8.1 Pulse output communication
EC350 provides four pulse outputs, three (channels A, B, and C) normally-open Form A type, and one
(channel D) normally closed Form B type. The pulse outputs are typically used for connection to an AMR
(Automatic Meter Reader) device.
These outputs are electronic switches that operate like an isolated bidirectional switch. Channels A, B, and
C (normally open type) can be configured as corrected volume or uncorrected volume. Channel C can
alternatively be configured as a (normally open) alarm output. Channel D (normally-closed type) is only for
alarm output use. All the pulse outputs of the EC350, including the alarm pulse output, use opto-isolators
for isolating the EC350 circuitry from the devices receiving the pulses. Opto-isolators are devices that
prevent unwanted current flow or possible damage from high voltage.
Alarm pulse outputs
An alarm pulse (on channel C or D) is generated when EC350 enters an alarm condition. Use channel C
(NO or Normally Open) or channel D (NC or Normally Closed) depending on the AMR device accepting the
alarm pulse. Use of channel D (NC) allows for a cut wire to be interpreted as an alarm condition to the
AMR device.
Volume pulse outputs
EC350 provides three Form-A pulse outputs (channels A, B, and C) for volume output pulses.
Volume pulses can correspond to either uncorrected volume (as counted in item 2) or corrected volume
(as counted in item 0). The type of volume pulse (and whether the channel is enabled) is configured
through items 93-95.
3 EC350 installation
3.8 General Wiring connections
Honeywell 2024
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