User guide

network integration
VERIS INDUSTRIES
800.354.8556
+1 503.598.4564
www.veris.com
SPECIFICATIONS
Processor ARM 7, eld upgradable rmware
LED 23 input status LEDs (red), 2 Modbus TX/RX (yellow), 1 power/alive status (green)
Protocols Modbus/ RTU
Power Supply 9VDC to 30VDC, 200mA (not included)
Serial Port RS-485 2-wire, 19200 or 9600 baud. N81
Pulse Inputs 23 independent pulse count inputs; 32-bit pulse counter; rolls over at 4.295 billion per channel;
Intended for use with dry contact outputs; pulse count values stored in nonvolatile memory; Pulse rate/width user selectable to 10 Hz, 50 Hz, or 100 Hz
Minimum Pulse Width:
10 Hz Mode 50 msec
50 Hz Mode 10 msec
100 Hz Mode 5 msec
Contact Closure Threshold 100 Ω to 5 kΩ (user selectable)
Isolation Pulse inputs, power inputs and RS-485 are non-isolated
Operating Environment:
North America Indoor, 0° to 50°C (32° to 122°F), 0-95% RH noncondensing
Agency Approvals FCC CFR 47 Part 15, Class A
DESCRIPTION
The A8911-23 Input Module provides an easy way to integrate multiple pulse output
devices to Modbus systems such as the Veris AcquiSuite data acquisition network.
The A8911-23 accepts up to 23 standard pulse sensors and can function as a slave
device with any Modbus master. This data can be networked to other critical energy
sensors such as Veris Modbus power meters to provide a comprehensive energy
monitoring solution.
APPLICATIONS
● Demand response program control and reporting
● Cost allocation to tenants and third parties
● Measurement and verication of energy savings
● Gas, water, steam, and BTU meters
● Monitoring performance of building systems (e.g., chillers, boilers, fans)
FEATURES
● External communications via shielded twisted pair 18-22 gauge wire...allows
communication up to 4000 feet
● Pulse input communication up to 200 feet using 18-24 gauge control wire
● DIN rail mounting...quick and easy installation
● Onboard DIP switches for Modbus addressing
● Industry standard pulse inputs connect to most pulse output meters
● LED verication of RS-485 Modbus TX/RX communications
● LED indicators for each pulse input...fast indication and verication of pulses
● Non-volatile memory retains conguration and pulse count totals during
power failures
Up to 23 Separate Pulse Inputs
Pulse Input Module
A8911-23 is sold as an open device.
Observe handling precautions for static sensitive
devices to avoid damage to the circuitry which
would not be covered under the factory warranty.
A8911-23
A8911–23
Year
Warranty
2
HQ0001806.B 01131