ShieldingThe use of shielded cables is normally not demanded but offers high protection against electro-magnetic interferences, especially high frequencies. However, the effectiveness of the shield dependson careful installation of the line.If shielded cables are used, the shield should be placed at “PE” on at least one side (preferably on themaster connection). The occurrence of compensating currents may have to be considered if the shieldis contacted on both sides.Shield connection correct Shield connection incorrectDefault interface parameterBaudrate = 19200Bits = 8Parity = Even (None, exception of devices agriculture)Stop bits = 1Handshake = noneInformationIf any matters are unclear, please contact our V-STE support department for control systems -ventilation technology. The information sheet "Network structure of MODBUS" R-TIL08_01 containsdetailed information about "MODBUS".5.14 Open-Collector output “A1” (status / tacho)Open-Collector pulse output for status display or speed display.Status display (function for factory setting)Depending on the operating state of the device, the output “A1” is switched toGND potential for a certain number of pulses.The status of the device can be displayed by this digitally coded signal.With the output voltage “+10 V” a standard LED / low-power LED can becontrolled by using a pull-up resistor.This lights when the output “A1 Status Out OC” (OC = Open-Collector) is on GNDpotential.The details of which pull-up resistor needs to be used depend on the specificationon the LED that is used.Explanation of flash codes Diagnostic / Status Out with flash code.Pull Up10V A1GND06.11.2013i_ecblue_a1_status_oc.eps200...300 ΩTacho outAlternatively, via output “A1”, the current motor speed can be output.The frequency (duty cycle 50 : 50) that can be measured by a pull-up resistor atthe output “A1” corresponds to the motor speed.Example: 10 Hz x 60 = 600 rpmPull Up10V A1GNDHzn = f x 605 kΩ06.11.2013i_ecblue_a1_tacho_oc.eps200...300 ΩA1 more specifications Technical data!Assembly instructions ECblue Electrical installationL-BAL-F055D-GB 1634 Index 002 Part.-No.23/51