QTech Data Systems Wireless Point to Point (WP2P) - Digital & Analogue I__O - Manual (Page 2)

Wireless Point to Point - DIGITAL & ANALOGUE - Quick Start Guide – v1.1 – June 2013 2
www.qtech.co.nz Tel: 03 3663713
Wireless Point to Point System
Wireless Point to Point (WP2P) modules can be used to link electrical devices together in
situations where the physical separation or terrain between them would make direct wiring
uneconomic or impractical.
The WP2P modules incorporate high speed digital radios which have a range of up to two
kilometres. The modules use the integrated low power 900MHz digital radios to communicate
their input state to the other module.
Each WP2P – DIGITAL & ANALOGUE module has two switch inputs, two relay outputs, one
analogue input and one analogue output.
Digital I/O
The WP2P modules operate by copying the state of each switch input to the corresponding
relay output on the other WP2P module. When a switch input is closed, the relay output on
the other module will close, and when the switch is released, the relay will open again.
WP2P Module 1
Close switch contact on “INP1” WP2P Module 2
“RLY1” closes operating light
The delay between an input activating and the corresponding output activating is normally
less than 0.2 seconds (see notes). With such a fast response time, the WP2P devices can be
used for flow meter pulse applications, allowing pulse rates of up to 5 pulses per second to be
communicated.
Analogue I/O
The WP2P – DIGITAL & ANALOGUE operates by copying the analogue input value to the
analogue output on the other module.
The analogue I/O can be configured for current loop or voltage operation. The factory default
configuration is for current loop operation. The analogue I/O operates over a range of 0-
20mA, which makes the WP2P – DIGITAL & ANALOGUE modules compatible with the
industry standard 4-20mA range, which allows detection of an open circuit failure.
The Analogue I/O has 12 bit resolution, a stated accuracy of +/-1%FSD, and is sampled at a
rate of once per second.
WP2P Module 1
Analogue 0-20mA signal input WP2P Module 2
Analogue 0-20mA signal output